title
DNS for Cybersecurity

description
Support Silicon Dojo at: https://www.donorbox.org/etcg http://www.silicondojo.com/ DNS for Cybersecurity What is DNS Maps name to IP address: cnn.com - 151.101.1.67 Threats to DNS DNS Tracking DNS Poisoning Malicious Websites/ Malware Employees… HOSTS File Local DNS Configuration DNS in Router/ Modem ISP’s and DNS Collecting data ISP’s collect your traffic and sell it to advertisers ISP’s may redirect bad URL’s Public DNS Google 8.8.8.8 8.8.4.4 Cloudflare 1.1.1.1 Websites Connecting to Other Sites When you go to a website, many other sites are embedded in the page and your information can be collected. https://developers.google.com/speed/pagespeed/insights/ Fingerprinting https://privacy.net/analyzer/#accordion https://www.whatsmybrowser.org/ Pi Hole DNS Cacheing Unbound Recursive DNS Communicates with Authoritative DNS Servers OpenDNS https://signup.opendns.com/homefree/ DNSSEC It’s a mess DNS Security Problems Can Cause Unexpected Problems Do you know EVERY domain name your clients use? Talk to your users Can users change DNS Settings?

detail
{'title': 'DNS for Cybersecurity', 'heatmap': [{'end': 2329.844, 'start': 2145.28, 'weight': 0.811}, {'end': 4557.228, 'start': 4516.059, 'weight': 0.891}], 'summary': 'Explores dns for cybersecurity, covering tools like pi-hole, opendns, and host files, and discusses dns resolution, security measures, tracking, isp spying, and network administration tools, emphasizing its role in network security, privacy protection, and ad-free browsing.', 'chapters': [{'end': 234.607, 'segs': [{'end': 30.682, 'src': 'embed', 'start': 0.376, 'weight': 0, 'content': [{'end': 1.117, 'text': 'Welcome back.', 'start': 0.376, 'duration': 0.741}, {'end': 5.201, 'text': "So today's seminar is DNS for cybersecurity.", 'start': 1.157, 'duration': 4.044}, {'end': 10.706, 'text': 'So this is the seminar that I presented here at Silicon Dojo Asheville last night.', 'start': 5.261, 'duration': 5.445}, {'end': 15.511, 'text': "And essentially this is like the director's cut of that particular seminar.", 'start': 10.986, 'duration': 4.525}, {'end': 22.898, 'text': 'Many of my followers at home have asked me to record the seminars while I am actually presenting them.', 'start': 15.871, 'duration': 7.027}, {'end': 30.682, 'text': 'And I have found in the real world, I am not sure why this is, but a camera is more of a door than it is a window.', 'start': 23.338, 'duration': 7.344}], 'summary': 'Seminar on dns for cybersecurity presented at silicon dojo, asheville, with a focus on recording presentations for followers.', 'duration': 30.306, 'max_score': 0.376, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA376.jpg'}, {'end': 81.049, 'src': 'embed', 'start': 47.248, 'weight': 2, 'content': [{'end': 51.59, 'text': "after I've seen what's gone well and what's gone poorly, I can come back.", 'start': 47.248, 'duration': 4.342}, {'end': 60.195, 'text': 'I can record the seminar and give you some notes on how to be able to present this at your Silicon Dojo or at your educational facility.', 'start': 51.59, 'duration': 8.605}, {'end': 62.336, 'text': "So that's what's basically going on here.", 'start': 60.435, 'duration': 1.901}, {'end': 70.881, 'text': 'Throughout this seminar, I will throw in like little notes from what I learned doing this thing last night and also if you go to SiliconDojo.com.', 'start': 62.556, 'duration': 8.325}, {'end': 81.049, 'text': 'The slide presentation will be available at SiliconDojo.com, plus a basic layout of all of the notes, the outline for the presentation,', 'start': 71.902, 'duration': 9.147}], 'summary': 'Seminar will provide notes and recording for presenting at silicon dojo or educational facility.', 'duration': 33.801, 'max_score': 47.248, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA47248.jpg'}, {'end': 151.778, 'src': 'embed', 'start': 105.289, 'weight': 4, 'content': [{'end': 111.054, 'text': 'So basically, I decided to do this DNS for cybersecurity class yesterday because people like cybersecurity.', 'start': 105.289, 'duration': 5.765}, {'end': 115.719, 'text': "Putting cybersecurity in the title is good for the whole clickbait, especially when you're using something like Meetup.", 'start': 111.114, 'duration': 4.605}, {'end': 121.525, 'text': 'And DNS is actually one of those services used for all internet communication.', 'start': 116.259, 'duration': 5.266}, {'end': 128.055, 'text': "Where it's very easy to add layers of security, people just simply don't think about it.", 'start': 122.326, 'duration': 5.729}, {'end': 132.261, 'text': "So the products that we're going to talk about today is we're going to be talking about the Pi-Hole.", 'start': 128.134, 'duration': 4.127}, {'end': 146.554, 'text': 'So this is a little DNS device you can create, talking about something called OpenDNS, which is a service that was actually purchased by Cisco,', 'start': 132.601, 'duration': 13.953}, {'end': 148.776, 'text': 'also a way to secure your systems using DNS.', 'start': 146.554, 'duration': 2.222}, {'end': 151.778, 'text': "We're going to be talking about the host file and those types of things.", 'start': 148.796, 'duration': 2.982}], 'summary': 'Dns for cybersecurity class discusses pi-hole, opendns, and host file for internet security.', 'duration': 46.489, 'max_score': 105.289, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA105289.jpg'}], 'start': 0.376, 'title': 'Dns and libreoffice for cybersecurity', 'summary': 'Discusses the use of dns for cybersecurity, highlighting tools such as pi-hole, opendns, and host files, and also explores creating cybersecurity diagrams using libreoffice draw, emphasizing its ease of use and pdf export capabilities.', 'chapters': [{'end': 104.929, 'start': 0.376, 'title': 'Dns for cybersecurity', 'summary': "Discusses the director's cut of a seminar on dns for cybersecurity, offering insights and resources for others to present the same seminar, providing access to the slide presentation and encouraging modification and use in other educational facilities.", 'duration': 104.553, 'highlights': ['Access to the slide presentation and outline for the seminar is available at SiliconDojo.com, encouraging others to modify and present the same seminar. (relevance score: 5)', 'The seminar provides insights and notes for others to present the seminar at their educational facilities, essentially making it open source. (relevance score: 4)', 'The speaker found that recording the seminar and using a camera in the real world environment can affect the experience negatively. (relevance score: 3)']}, {'end': 151.778, 'start': 105.289, 'title': 'Dns for cybersecurity class', 'summary': 'Discusses the use of dns for cybersecurity, highlighting the pi-hole, opendns, and host files as key tools for securing internet communication and systems.', 'duration': 46.489, 'highlights': ['The Pi-Hole is a DNS device that can be created to enhance security for internet communication.', 'OpenDNS, a service acquired by Cisco, is mentioned as a tool for securing systems using DNS.', 'The chapter emphasizes the importance of adding layers of security to DNS for internet communication.']}, {'end': 234.607, 'start': 152.058, 'title': 'Creating diagrams with libreoffice', 'summary': 'Discusses the value of using libreoffice draw to create cybersecurity diagrams, highlighting its ease of use and the ability to export diagrams as pdf files for presentations.', 'duration': 82.549, 'highlights': ['LibreOffice Draw allows for the creation of cybersecurity diagrams with freely available icon packs and the ability to export them as PDF files for presentations.', 'The chapter emphasizes the value and ease of use of LibreOffice Draw for creating diagrams, addressing the need for cybersecurity concepts visualization.', 'The speaker shares the process of using LibreOffice Draw to create diagrams, highlighting its practicality and effectiveness for cybersecurity education.']}], 'duration': 234.231, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA376.jpg', 'highlights': ['Access to the slide presentation and outline for the seminar is available at SiliconDojo.com, encouraging others to modify and present the same seminar.', 'The seminar provides insights and notes for others to present the seminar at their educational facilities, essentially making it open source.', 'The Pi-Hole is a DNS device that can be created to enhance security for internet communication.', 'OpenDNS, a service acquired by Cisco, is mentioned as a tool for securing systems using DNS.', 'LibreOffice Draw allows for the creation of cybersecurity diagrams with freely available icon packs and the ability to export them as PDF files for presentations.', 'The chapter emphasizes the value and ease of use of LibreOffice Draw for creating diagrams, addressing the need for cybersecurity concepts visualization.']}, {'end': 1129.664, 'segs': [{'end': 266.175, 'src': 'embed', 'start': 234.987, 'weight': 0, 'content': [{'end': 245.114, 'text': 'That was one of the valuable lessons that I learned from doing this particular seminar is basically the idea of how to create those diagrams easily and inexpensively.', 'start': 234.987, 'duration': 10.127}, {'end': 249.157, 'text': "So anyways, let's dive in to this particular seminar.", 'start': 245.454, 'duration': 3.703}, {'end': 252.159, 'text': "So again, we're going to be doing DNS for cybersecurity.", 'start': 249.177, 'duration': 2.982}, {'end': 253.94, 'text': 'When we talk about DNS.', 'start': 252.439, 'duration': 1.501}, {'end': 266.175, 'text': 'basically what DNS is is domain name services, and what DNS does is a qualified domain name, something like cnn.com, something like fox.com server.', 'start': 253.94, 'duration': 12.235}], 'summary': 'Seminar taught creation of diagrams for dns cybersecurity easily and inexpensively.', 'duration': 31.188, 'max_score': 234.987, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA234987.jpg'}, {'end': 560.902, 'src': 'embed', 'start': 514.167, 'weight': 2, 'content': [{'end': 518.792, 'text': 'there are a number of different threats that you have to deal with with this whole DNS system.', 'start': 514.167, 'duration': 4.625}, {'end': 529.035, 'text': "tracking. So what DNS tracking is is basically remember whenever you're going to connect to somebody else's server,", 'start': 521.907, 'duration': 7.128}, {'end': 533.98, 'text': 'not only are you getting information from them, but they are also getting information from you.', 'start': 529.035, 'duration': 4.945}, {'end': 539.906, 'text': "So, basically, when you go to your ISP's DNS server and you request cnn.com,", 'start': 534.34, 'duration': 5.566}, {'end': 547.593, 'text': "they are able to log your IP address with that domain name and they know that you've gone to that website.", 'start': 539.906, 'duration': 7.687}, {'end': 556.079, 'text': 'Now with SSL and other things, they may not know exactly what you looked at on that website, but they will know that you have gone to that website.', 'start': 548.073, 'duration': 8.006}, {'end': 558.26, 'text': 'The interesting things with these ISPs.', 'start': 556.459, 'duration': 1.801}, {'end': 560.902, 'text': 'these ISPs have a whole bunch of information about you, right?', 'start': 558.26, 'duration': 2.642}], 'summary': 'Dns system faces multiple threats, including tracking by isps, logging ip addresses and website visits.', 'duration': 46.735, 'max_score': 514.167, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA514167.jpg'}, {'end': 704.906, 'src': 'embed', 'start': 682.017, 'weight': 4, 'content': [{'end': 689.507, 'text': 'The DNS resolution, many times though, can leak out and actually go through your standard network connection.', 'start': 682.017, 'duration': 7.49}, {'end': 694.654, 'text': "So imagine, right, you're going to, I don't know, I like, let's say you're a Second Amendment person.", 'start': 689.808, 'duration': 4.846}, {'end': 696.477, 'text': "I don't think that's going to get me into too much trouble.", 'start': 694.674, 'duration': 1.803}, {'end': 699.3, 'text': "Let's say you're a Second Amendment person and you like guns.", 'start': 696.497, 'duration': 2.803}, {'end': 704.906, 'text': "you like 3d printed guns and all that kind of stuff and you're worried about whether or not the government is going to track you.", 'start': 699.3, 'duration': 5.606}], 'summary': 'Dns resolution can leak out, impacting second amendment advocates concerned about government tracking.', 'duration': 22.889, 'max_score': 682.017, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA682017.jpg'}, {'end': 1014.976, 'src': 'embed', 'start': 989.215, 'weight': 6, 'content': [{'end': 996.92, 'text': '20 other sites that are doing who the hell knows what and basically, when you go to cnn.com, not only is cnn able to grab your information and such,', 'start': 989.215, 'duration': 7.705}, {'end': 1004.014, 'text': 'but all of these other companies are able to grab your information, But depending on the security of your web browser and a few other things,', 'start': 996.92, 'duration': 7.094}, {'end': 1009.535, 'text': 'they can try to trigger things that will occur on your computer, to try to compromise your systems.', 'start': 1004.014, 'duration': 5.521}, {'end': 1014.976, 'text': "So this is where we've heard about recently where basically nefarious advertising on websites.", 'start': 1009.815, 'duration': 5.161}], 'summary': 'Multiple websites can collect user information, potentially compromising systems through nefarious advertising.', 'duration': 25.761, 'max_score': 989.215, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA989215.jpg'}, {'end': 1083.353, 'src': 'embed', 'start': 1050.945, 'weight': 5, 'content': [{'end': 1053.367, 'text': "Why does a server have porn? Don't get me wrong.", 'start': 1050.945, 'duration': 2.422}, {'end': 1058.412, 'text': "Don't get me wrong, right? When I get a 14-year-old kid's computer and it has porn on it, I get it.", 'start': 1053.427, 'duration': 4.985}, {'end': 1064.257, 'text': "When I get the parent of the 14-year-old's computer that has porn on it, I get it.", 'start': 1059.533, 'duration': 4.724}, {'end': 1076.431, 'text': 'When I get the work computer of the parent who Why the hell does a server have porn on it? There is no point.', 'start': 1065.017, 'duration': 11.414}, {'end': 1083.353, 'text': "You should be using a web browser on a server to go look at porn sites or video game sites or anything else, right? It's a security failure.", 'start': 1076.471, 'duration': 6.882}], 'summary': 'Questioning the presence of porn on a server, emphasizing security failure.', 'duration': 32.408, 'max_score': 1050.945, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1050945.jpg'}], 'start': 234.987, 'title': 'Dns in cybersecurity', 'summary': 'Explores the concept of dns, its role in resolving domain names to ip addresses, dns resolution process, local dns servers, dns tracking, leakage, poisoning, and the importance of dns security measures in preventing unauthorized access and protecting against malicious activities.', 'chapters': [{'end': 743.155, 'start': 234.987, 'title': 'Understanding dns for cybersecurity', 'summary': 'Delves into the concept of dns (domain name services) and its vital role in resolving domain names to ip addresses. it explains the process of dns resolution, the role of local dns servers, and the potential threats such as dns tracking and leakage.', 'duration': 508.168, 'highlights': ['DNS resolves domain names to IP addresses, enabling users to access servers through easily remembered names like cnn.com, while computers require IP addresses for communication. Explains the purpose of DNS in mapping domain names to IP addresses, facilitating user-friendly access to websites.', 'The DNS resolution process involves the host file on the computer, local DNS server, and external DNS servers provided by ISPs or other entities. Describes the steps involved in DNS resolution, including the role of the host file and the hierarchy of DNS servers.', "DNS tracking allows ISPs to log users' IP addresses with domain names, enabling them to sell this information to advertisers, raising privacy concerns. Discusses the privacy implications of DNS tracking, highlighting how ISPs collect and monetize users' browsing data.", "DNS leakage can occur when using services like Tor or VPNs, potentially exposing users' DNS requests to standard network connections, compromising privacy. Explains the potential risk of DNS leakage in using privacy-focused services like Tor or VPNs, emphasizing the threat to user privacy."]}, {'end': 1129.664, 'start': 743.155, 'title': 'Dns tracking and dns poisoning', 'summary': "Discusses the issues of dns tracking and dns poisoning, including the risk of dns leakage, phishing attacks, and the potential security vulnerabilities caused by employees' web browsing, with emphasis on the importance of dns security measures in preventing unauthorized access to websites and protecting against malicious advertisements and hacking attempts.", 'duration': 386.509, 'highlights': ['DNS poisoning can lead to potential security vulnerabilities, such as phishing attacks and unauthorized access to websites, with the risk of sensitive information being compromised. DNS poisoning can trick users into resolving to an entirely different IP address controlled by hackers, leading to potential security breaches and capturing sensitive information, such as usernames and passwords.', 'The chapter emphasizes the importance of DNS security measures in preventing unauthorized access to websites and protecting against potential hacking attempts and malicious advertisements. DNS security measures are crucial in preventing unauthorized access to websites, protecting against potential hacking attempts, and blocking malicious advertisements, highlighting the significance of implementing robust DNS security measures.', "The risks associated with employees' web browsing, including the potential compromise of system security, are discussed, emphasizing the need for strict policies to prevent unauthorized web browsing on servers and appliances. The risks of employees' web browsing on servers and appliances, leading to compromised system security, are highlighted, underscoring the importance of implementing strict policies to prevent unauthorized web browsing and protect against security vulnerabilities."]}], 'duration': 894.677, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA234987.jpg', 'highlights': ['DNS resolves domain names to IP addresses, facilitating user-friendly access to websites.', 'The DNS resolution process involves the host file, local DNS server, and external DNS servers.', "DNS tracking enables ISPs to log users' IP addresses with domain names, raising privacy concerns.", 'DNS leakage can compromise user privacy when using services like Tor or VPNs.', 'DNS poisoning can lead to security vulnerabilities, such as phishing attacks and unauthorized access.', 'The chapter emphasizes the importance of DNS security measures in preventing unauthorized access.', "Risks of employees' web browsing on servers and appliances underscore the need for strict policies."]}, {'end': 1777.869, 'segs': [{'end': 1359.949, 'src': 'embed', 'start': 1331.847, 'weight': 2, 'content': [{'end': 1335.751, 'text': "And I don't want my people going to particular websites on this particular computer.", 'start': 1331.847, 'duration': 3.904}, {'end': 1340.916, 'text': 'Again, what might be very important is Facebook, Instagram, Twitter, right? All that kind of normal stuff.', 'start': 1335.791, 'duration': 5.125}, {'end': 1344.019, 'text': 'So I want to prevent them from going to these types of sites.', 'start': 1341.016, 'duration': 3.003}, {'end': 1347.301, 'text': 'up terminal.', 'start': 1346.741, 'duration': 0.56}, {'end': 1351.844, 'text': 'So this is the terminal on the Mac OS.', 'start': 1347.542, 'duration': 4.302}, {'end': 1354.406, 'text': 'And basically, we can plug in the command.', 'start': 1352.344, 'duration': 2.062}, {'end': 1357.428, 'text': "And so what we're going to be doing here is sudo, so super user do.", 'start': 1354.426, 'duration': 3.002}, {'end': 1359.949, 'text': "We're going to use the editor called nano.", 'start': 1357.588, 'duration': 2.361}], 'summary': 'Prevent access to specific websites on mac os using terminal commands.', 'duration': 28.102, 'max_score': 1331.847, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1331847.jpg'}, {'end': 1423.911, 'src': 'embed', 'start': 1374.584, 'weight': 0, 'content': [{'end': 1380.846, 'text': 'so host database localhost is used, configuring loopback, blah, blah, blah, and so we have this information here.', 'start': 1374.584, 'duration': 6.262}, {'end': 1385.647, 'text': "so right now i can still go to tacobel.com, but that's that cannot stand.", 'start': 1380.846, 'duration': 4.801}, {'end': 1387.067, 'text': 'i do not like taco bell.', 'start': 1385.647, 'duration': 1.42}, {'end': 1389.928, 'text': 'my employees will not go to taco bell the whole nine yards.', 'start': 1387.067, 'duration': 2.861}, {'end': 1398.272, 'text': 'so what i can do is go to 1.7 And then I put a space and then I put tacobell.com.', 'start': 1389.928, 'duration': 8.344}, {'end': 1403.171, 'text': 'So we go to tacobell.com, I wanna go to 127.0.001.', 'start': 1398.812, 'duration': 4.359}, {'end': 1404.292, 'text': 'And then I come down here and do 127.0.0.1.', 'start': 1403.171, 'duration': 1.121}, {'end': 1412.32, 'text': 'And then I do www.tacobell.com.', 'start': 1404.292, 'duration': 8.028}, {'end': 1417.385, 'text': "And so for tacobell.com and www.tacobell.com, they're both going to loop back.", 'start': 1412.9, 'duration': 4.485}, {'end': 1418.266, 'text': 'This is one thing.', 'start': 1417.645, 'duration': 0.621}, {'end': 1422.229, 'text': 'If you go to the host file, you should do a little bit more research on how the host file works.', 'start': 1418.286, 'duration': 3.943}, {'end': 1423.911, 'text': 'You can use things like wildcards.', 'start': 1422.249, 'duration': 1.662}], 'summary': 'Configuring loopback for tacobell.com and www.tacobell.com to redirect to 127.0.0.1', 'duration': 49.327, 'max_score': 1374.584, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1374584.jpg'}, {'end': 1541.76, 'src': 'embed', 'start': 1514.324, 'weight': 5, 'content': [{'end': 1517.887, 'text': 'this is a server that it needs to go to a website.', 'start': 1514.324, 'duration': 3.563}, {'end': 1520.609, 'text': "that's in the blacklist on this particular title.", 'start': 1517.887, 'duration': 2.722}, {'end': 1524.472, 'text': 'What you could do is you could go to the host file in this server.', 'start': 1521.309, 'duration': 3.163}, {'end': 1532.537, 'text': 'You could manually input the information, because it will go to the host file first before it goes here and then, if it finds an entry,', 'start': 1524.832, 'duration': 7.705}, {'end': 1534.299, 'text': 'it will just go out to that IP address.', 'start': 1532.537, 'duration': 1.762}, {'end': 1541.76, 'text': "And so that's the nice thing about the host file is this allows you to kind of create unique DNS configurations for each individual computer.", 'start': 1534.819, 'duration': 6.941}], 'summary': 'Server can access blacklisted website by editing host file with unique dns configurations.', 'duration': 27.436, 'max_score': 1514.324, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1514324.jpg'}], 'start': 1133.363, 'title': 'Dns, host file, and website blocking', 'summary': 'Covers using dns to block specific sites, configuring the host file on mac os to redirect website requests to 127.0.0.1, and emphasizes the significance of dns configurations for network security and control.', 'chapters': [{'end': 1331.327, 'start': 1133.363, 'title': 'Dns and host file for network security', 'summary': 'Discusses using dns to block access to specific sites, and demonstrates using the host file to redirect website requests, such as blocking access to tacobell.com, for network security and control.', 'duration': 197.964, 'highlights': ['DNS can block specific site access DNS can be used to prevent employees from accessing certain websites, such as YouTube, porn sites, and file sharing sites, enhancing network security and control.', 'Using the host file to redirect website requests The host file can be manipulated to redirect website requests, such as redirecting TacoBell.com to 127.0.0.1, effectively blocking access to the site for network security and control.', 'Practical demonstration of website access control The demonstration includes accessing TacoBell.com and manipulating the host file to redirect requests, showcasing the practical implementation of website access control and network security.']}, {'end': 1777.869, 'start': 1331.847, 'title': 'Configuring host file for website blocking', 'summary': 'Explains the process of blocking specific websites by configuring the host file on a mac os, including the use of sudo command, editing the host file to redirect website urls to 127.0.0.1, and the significance of dns configurations.', 'duration': 446.022, 'highlights': ['The process of blocking specific websites by configuring the host file on a Mac OS The demonstration shows how to use the sudo command and the nano editor to edit the host file on a Mac OS in order to block specific websites such as taco bell.', 'Editing the host file to redirect website URLs to 127.0.0.1 The host file is edited to redirect specific website URLs to the loopback address 127.0.0.1, effectively blocking access to those websites on the local system.', 'Significance of DNS configurations The importance of DNS configurations is highlighted, with the ability to customize DNS settings at the individual computer level, as well as the significance of utilizing alternative DNS servers such as OpenDNS and Google servers to avoid ISP data collection and potential privacy concerns.']}], 'duration': 644.506, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1133363.jpg', 'highlights': ['DNS can block specific site access DNS can be used to prevent employees from accessing certain websites, such as YouTube, porn sites, and file sharing sites, enhancing network security and control.', 'Using the host file to redirect website requests The host file can be manipulated to redirect website requests, such as redirecting TacoBell.com to 127.0.0.1, effectively blocking access to the site for network security and control.', 'Practical demonstration of website access control The demonstration includes accessing TacoBell.com and manipulating the host file to redirect requests, showcasing the practical implementation of website access control and network security.', 'The process of blocking specific websites by configuring the host file on a Mac OS The demonstration shows how to use the sudo command and the nano editor to edit the host file on a Mac OS in order to block specific websites such as taco bell.', 'Editing the host file to redirect website URLs to 127.0.0.1 The host file is edited to redirect specific website URLs to the loopback address 127.0.0.1, effectively blocking access to those websites on the local system.', 'Significance of DNS configurations The importance of DNS configurations is highlighted, with the ability to customize DNS settings at the individual computer level, as well as the significance of utilizing alternative DNS servers such as OpenDNS and Google servers to avoid ISP data collection and potential privacy concerns.']}, {'end': 2239.874, 'segs': [{'end': 1805.605, 'src': 'embed', 'start': 1778.129, 'weight': 0, 'content': [{'end': 1783.654, 'text': 'So one of the big problems we have right now is that ISPs are literally collecting your information to sell to advertisers.', 'start': 1778.129, 'duration': 5.525}, {'end': 1788.899, 'text': 'One of the big issues here is that people right now are really focused on tracking cookies.', 'start': 1783.954, 'duration': 4.945}, {'end': 1790.28, 'text': 'Have you heard of tracking cookies?', 'start': 1788.939, 'duration': 1.341}, {'end': 1793.343, 'text': 'Are you scared of tracking cookies?', 'start': 1790.64, 'duration': 2.703}, {'end': 1796.726, 'text': "Great, because that's not really what you should be scared of, right?", 'start': 1794.144, 'duration': 2.582}, {'end': 1798.267, 'text': 'So right now, like in Europe,', 'start': 1796.966, 'duration': 1.301}, {'end': 1805.605, 'text': "Websites that deal with Europe are a flipping mess right now because over in Europe they're so scared of tracking cookies.", 'start': 1799.403, 'duration': 6.202}], 'summary': 'Isps collecting data to sell, focus on tracking cookies, concern in europe.', 'duration': 27.476, 'max_score': 1778.129, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1778129.jpg'}, {'end': 1904.508, 'src': 'embed', 'start': 1871.94, 'weight': 1, 'content': [{'end': 1877.445, 'text': "they can see what sites you're going to, and then all of that information just gets dumped into a database, right?", 'start': 1871.94, 'duration': 5.505}, {'end': 1880.307, 'text': "And if that information is dumped into a database, then it's searchable.", 'start': 1877.585, 'duration': 2.722}, {'end': 1883.33, 'text': 'then they can trigger advertisements and all that kind of stuff off of it.', 'start': 1880.307, 'duration': 3.023}, {'end': 1889.456, 'text': "So that's one of the reasons, you know, we get into an issue with ISPs literally selling your DNS information.", 'start': 1883.771, 'duration': 5.685}, {'end': 1894.2, 'text': 'The other problem you get into with the ISPs is that many times they redirect those bad URLs.', 'start': 1889.756, 'duration': 4.444}, {'end': 1904.508, 'text': "Again, if you go to a website and then you fat finger you know you're typing in the website and you screw it up instead of it failing out cleanly and just giving you the website doesn't exist,", 'start': 1894.54, 'duration': 9.968}], 'summary': 'Isps can collect and sell dns information, redirect bad urls, and trigger targeted advertisements.', 'duration': 32.568, 'max_score': 1871.94, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1871940.jpg'}, {'end': 2062.456, 'src': 'embed', 'start': 2032.392, 'weight': 2, 'content': [{'end': 2036.908, 'text': "Uh, and so I wouldn't get those bad URLs, you know, issues that I was talking about before.", 'start': 2032.392, 'duration': 4.516}, {'end': 2041.36, 'text': 'a lot of people went over to Google.', 'start': 2040.179, 'duration': 1.181}, {'end': 2047.185, 'text': "They then realized, wait a minute, now instead of giving all my information to the ISP, I'm giving all my information to Google.", 'start': 2041.96, 'duration': 5.225}, {'end': 2054.751, 'text': "So, even when I'm not logged into my Gmail account, even when I'm not logged into YouTube, even when I'm not logged into any Google services at all,", 'start': 2047.585, 'duration': 7.166}, {'end': 2057.553, 'text': "they're still logging in basically all the DNS resolution.", 'start': 2054.751, 'duration': 2.802}, {'end': 2062.456, 'text': 'Plus, they can also correlate that to all the information they have from your Gmail account and everything else.', 'start': 2057.773, 'duration': 4.683}], 'summary': 'Many users turned to google to avoid isp privacy issues, but google still collects dns data and correlates it with user information.', 'duration': 30.064, 'max_score': 2032.392, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2032392.jpg'}, {'end': 2110.457, 'src': 'embed', 'start': 2087.132, 'weight': 3, 'content': [{'end': 2094.514, 'text': "We just want to provide a high quality public DNS service and all you're going to get is a high quality public DNS service,", 'start': 2087.132, 'duration': 7.382}, {'end': 2095.914, 'text': "and we're going to do this for marketing.", 'start': 2094.514, 'duration': 1.4}, {'end': 2100.155, 'text': 'Hey, Cloudflare provides good high quality infrastructure as a service.', 'start': 2096.114, 'duration': 4.041}, {'end': 2101.755, 'text': 'So Cloudflare came out.', 'start': 2100.615, 'duration': 1.14}, {'end': 2110.457, 'text': 'they have an IP address of 1.1.1.1, and so, basically, if you plug this in as the DNS that you will resolve to, you will go to Cloudflare servers.', 'start': 2101.755, 'duration': 8.702}], 'summary': 'Cloudflare aims to offer high quality public dns service with ip address 1.1.1.1', 'duration': 23.325, 'max_score': 2087.132, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2087132.jpg'}, {'end': 2151.062, 'src': 'embed', 'start': 2118.939, 'weight': 4, 'content': [{'end': 2123.78, 'text': 'Cloudflare is not trying to make money off of you in other ways other than basically just brand recognition.', 'start': 2118.939, 'duration': 4.841}, {'end': 2126.161, 'text': 'And so that might be a better way to go.', 'start': 2124.12, 'duration': 2.041}, {'end': 2128.201, 'text': 'So these are public DNS services.', 'start': 2126.541, 'duration': 1.66}, {'end': 2132.122, 'text': 'You know what you decide to do.', 'start': 2128.781, 'duration': 3.341}, {'end': 2137.723, 'text': 'Again, the main reason I use Google services is not for the data collection.', 'start': 2132.202, 'duration': 5.521}, {'end': 2140.644, 'text': "Because they're all collecting data on us all the time anyway.", 'start': 2137.964, 'duration': 2.68}, {'end': 2143.525, 'text': "It's actually for that whole bad URL problem.", 'start': 2141.264, 'duration': 2.261}, {'end': 2151.062, 'text': 'The next problem that you run into with DNS is basically, when you go to a website,', 'start': 2145.28, 'duration': 5.782}], 'summary': 'Cloudflare and google offer public dns services for better brand recognition and addressing bad url problems.', 'duration': 32.123, 'max_score': 2118.939, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2118939.jpg'}], 'start': 1778.129, 'title': 'Isp spying and public dns services', 'summary': "Discusses isp spying, tracking cookies, and fingerprinting, proposing google's public dns servers as a solution and cloudflare's 1.1.1.1 dns service emphasizing privacy and security, with potential risks of third-party elements.", 'chapters': [{'end': 2062.456, 'start': 1778.129, 'title': 'Isp spying: tracking and solutions', 'summary': "Discusses the issues of isp spying, including tracking cookies and fingerprinting, and proposes using google's public dns servers as a solution to avoid isp spying and improve performance.", 'duration': 284.327, 'highlights': ["ISPs tracking cookies and fingerprinting are major concerns The chapter highlights the shift in focus from tracking cookies to fingerprinting, which involves advertisers tracking users' activities by creating unique identifiers based on IP address, web browser, and operating system, leading to the dumping of information into a searchable database.", "Concerns about ISPs redirecting bad URLs and DNS servers The issues of ISPs redirecting bad URLs and providing slow DNS services are discussed, leading to confusion and performance issues for users, prompting the recommendation of using Google's public DNS servers (8.8.8.8 and 8.8.4.4) for improved performance and to avoid ISP spying.", "Using Google's public DNS servers to avoid ISP spying The chapter suggests using Google's public DNS servers as a solution to avoid ISP spying, citing an improvement in performance compared to ISP's slow DNS services and highlighting the trade-off of giving user information to Google instead of ISPs."]}, {'end': 2239.874, 'start': 2063.036, 'title': 'Cloudflare public dns service', 'summary': "Discusses cloudflare's launch of a public dns service, 1.1.1.1, emphasizing on privacy and security, and the potential risks associated with third-party elements embedded in websites.", 'duration': 176.838, 'highlights': ['Cloudflare introduces public DNS service, 1.1.1.1, prioritizing privacy and security over data monetization, aiming for brand recognition. Cloudflare launches public DNS service, 1.1.1.1, focusing on privacy and security, not selling user information, but aiming for brand recognition.', 'Concerns about third-party elements embedded in websites collecting user information and potential risks of triggering malicious code. Discussion about the potential risks of third-party elements embedded in websites collecting user information and triggering malicious code.', 'PageSpeed Insights tool for analyzing website performance and identifying issues, providing valuable insights for website owners. Introduction of PageSpeed Insights tool for analyzing website performance and identifying issues, beneficial for website owners.']}], 'duration': 461.745, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA1778129.jpg', 'highlights': ["The shift in focus from tracking cookies to fingerprinting is a major concern, involving advertisers tracking users' activities by creating unique identifiers based on IP address, web browser, and operating system.", "Using Google's public DNS servers (8.8.8.8 and 8.8.4.4) is recommended for improved performance and to avoid ISP spying, addressing the issues of ISPs redirecting bad URLs and providing slow DNS services.", 'Cloudflare launches public DNS service, 1.1.1.1, prioritizing privacy and security over data monetization, aiming for brand recognition.', 'The potential risks of third-party elements embedded in websites collecting user information and triggering malicious code are discussed.', 'Introduction of PageSpeed Insights tool for analyzing website performance and identifying issues, beneficial for website owners.']}, {'end': 2546.983, 'segs': [{'end': 2421.103, 'src': 'embed', 'start': 2391.809, 'weight': 1, 'content': [{'end': 2396.372, 'text': 'So this, this gives you some of the information that they can basically fingerprint off of.', 'start': 2391.809, 'duration': 4.563}, {'end': 2398.694, 'text': 'So you understand how this works right?', 'start': 2396.893, 'duration': 1.801}, {'end': 2405.456, 'text': 'So, basically, I just go to this whatsmybrowser.org, and simply because I went to this particular website,', 'start': 2399.113, 'duration': 6.343}, {'end': 2414.04, 'text': "it's able to show a lot of information about my particular system, and all of this can be used to fingerprint you as you travel through the internet.", 'start': 2405.456, 'duration': 8.584}, {'end': 2421.103, 'text': "So my operating system is OS X 10.15.7, so the specific version of the Mac OS that I'm using.", 'start': 2414.38, 'duration': 6.723}], 'summary': 'Visiting whatsmybrowser.org reveals system details, enabling online fingerprinting.', 'duration': 29.294, 'max_score': 2391.809, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2391809.jpg'}, {'end': 2456.06, 'src': 'embed', 'start': 2433.229, 'weight': 0, 'content': [{'end': 2442.433, 'text': "And so, basically, what they can do here is not only can they trigger advertisements based off of the IP address, but one of the issues is, let's say,", 'start': 2433.229, 'duration': 9.204}, {'end': 2445.815, 'text': 'you have 10 different users all using the same IP address.', 'start': 2442.433, 'duration': 3.382}, {'end': 2447.476, 'text': "Well, that's where fingerprinting comes in.", 'start': 2446.095, 'duration': 1.381}, {'end': 2456.06, 'text': "So I'm using OS 10.15.7 at this IP address with some of this other information.", 'start': 2447.896, 'duration': 8.164}], 'summary': 'Ad targeting based on ip address, countered by fingerprinting with os 10.15.7.', 'duration': 22.831, 'max_score': 2433.229, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2433229.jpg'}, {'end': 2531.011, 'src': 'embed', 'start': 2506.68, 'weight': 2, 'content': [{'end': 2512.744, 'text': "And again, as you're going through the internet, All of these different sites and such are trying to collect all of this information,", 'start': 2506.68, 'duration': 6.064}, {'end': 2516.646, 'text': "and that's one of the reasons it can be rather of a problem, right?", 'start': 2512.744, 'duration': 3.902}, {'end': 2521.127, 'text': 'So basically, what we use in order to stop,', 'start': 2517.706, 'duration': 3.421}, {'end': 2531.011, 'text': "try to stop this kind of tracking and try to increase the performance when you're going to websites is you use this little DNS device called a Pi-hole.", 'start': 2521.127, 'duration': 9.884}], 'summary': 'Using a pi-hole to prevent internet tracking and enhance website performance', 'duration': 24.331, 'max_score': 2506.68, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2506680.jpg'}], 'start': 2240.339, 'title': 'Tracking and pixel issues', 'summary': 'Delves into tracking activity on cnn.com, revealing extensive data collection and connections, and discusses pixel tracking and fingerprinting issues, highlighting user information collection and the use of pi-hole as a solution to prevent tracking.', 'chapters': [{'end': 2290.029, 'start': 2240.339, 'title': 'Tracking activity on cnn.com', 'summary': 'Illustrates the process of tracking the various domains and servers cnn.com connects to, revealing the extensive data collection and connections made by the website, including outbrain and pixel trackers.', 'duration': 49.69, 'highlights': ['The process demonstrates the extensive data collection and connections made by cnn.com, including connections to Outbrain and pixel trackers.', 'The report reveals the numerous domains and servers being accessed by cnn.com, showcasing the extensive web of connections made by the website.', 'The demonstration emphasizes the significant reach of cnn.com, connecting to various domains and servers, indicating extensive data collection and content delivery.']}, {'end': 2546.983, 'start': 2290.029, 'title': 'Pixel tracking and fingerprinting', 'summary': 'Discusses the issues of pixel tracking and fingerprinting on websites, highlighting the collection of extensive user information through pixel trackers and the use of pi-hole as a solution to prevent such tracking and enhance website performance.', 'duration': 256.954, 'highlights': ['Pixel trackers like pubomatic.com, scorecardresearch.com, and ads by LinkedIn are used to collect user information when visiting websites, enabling the tracking of web browser activities. These pixel trackers can collect extensive user information, such as web browser activities, from a single pixel, leading to privacy concerns and potential data exploitation.', 'The chapter emphasizes the extensive data collection by various servers and domains like IOTA, ShareThru, BlueKai, Outbrain, and Summer Hamster, raising privacy concerns about the collection of user information. Multiple servers and domains are identified as collecting user information, raising privacy concerns and highlighting the need for user protection against extensive data collection.', "The detailed information that can be extracted from a user's system, such as the operating system, IP address, enabled features, and screen details, is highlighted as part of the fingerprinting process, demonstrating the extent of user tracking and identification. The chapter explains the specific details that can be extracted from a user's system, including operating system, IP address, enabled features, and screen details, showcasing the extensive tracking and identification capabilities of fingerprinting techniques.", 'The use of Pi-hole is introduced as a solution to prevent pixel tracking and enhance website performance, dispelling the misconception that it requires a Raspberry Pi and highlighting its compatibility with various systems like Ubuntu. The Pi-hole is presented as a solution to prevent pixel tracking and improve website performance, with emphasis on its compatibility with systems beyond Raspberry Pi, addressing common misconceptions about its usage.']}], 'duration': 306.644, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2240339.jpg', 'highlights': ['Pixel trackers like pubomatic.com, scorecardresearch.com, and ads by LinkedIn are used to collect user information when visiting websites, enabling the tracking of web browser activities.', "The detailed information that can be extracted from a user's system, such as the operating system, IP address, enabled features, and screen details, is highlighted as part of the fingerprinting process, demonstrating the extent of user tracking and identification.", 'The process demonstrates the extensive data collection and connections made by cnn.com, including connections to Outbrain and pixel trackers.', 'The use of Pi-hole is introduced as a solution to prevent pixel tracking and enhance website performance, dispelling the misconception that it requires a Raspberry Pi and highlighting its compatibility with various systems like Ubuntu.']}, {'end': 2849.08, 'segs': [{'end': 2650.139, 'src': 'embed', 'start': 2612.377, 'weight': 1, 'content': [{'end': 2619.6, 'text': "Okay, so see how it's kind of slow, how it takes a minute to load up? We got a big advertisement up here, so that's coming in.", 'start': 2612.377, 'duration': 7.223}, {'end': 2624.383, 'text': "Remember, this advertisement is being provided by somebody else's server.", 'start': 2619.72, 'duration': 4.663}, {'end': 2628.304, 'text': "So there's a CNN server, but this is being provided by somebody else's server.", 'start': 2624.483, 'duration': 3.821}, {'end': 2631.346, 'text': "If we scroll down, You're going to see advertisements over there.", 'start': 2628.324, 'duration': 3.022}, {'end': 2633.408, 'text': "Those are being provided by somebody else's server.", 'start': 2631.466, 'duration': 1.942}, {'end': 2636.49, 'text': "They're collecting your information as this is being presented.", 'start': 2633.508, 'duration': 2.982}, {'end': 2638.211, 'text': 'So they know what your IP address is.', 'start': 2636.51, 'duration': 1.701}, {'end': 2639.011, 'text': 'They know your browser.', 'start': 2638.231, 'duration': 0.78}, {'end': 2639.992, 'text': 'They know all this information.', 'start': 2639.031, 'duration': 0.961}, {'end': 2641.753, 'text': "They know you're on CNN.com.", 'start': 2640.032, 'duration': 1.721}, {'end': 2644.355, 'text': "They're collecting all of that, dumping it into a database.", 'start': 2642.093, 'duration': 2.262}, {'end': 2650.139, 'text': 'Not only that, if you come down, they have the Outbrain stuff and the other crap.', 'start': 2645.195, 'duration': 4.944}], 'summary': 'Ads on website collecting user data, slowing down load time. provided by external servers.', 'duration': 37.762, 'max_score': 2612.377, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2612377.jpg'}, {'end': 2744.832, 'src': 'embed', 'start': 2712.307, 'weight': 0, 'content': [{'end': 2719.27, 'text': 'Basically, if I come up here and I start using Pihole for my DNS services, you will see all of that disappear.', 'start': 2712.307, 'duration': 6.963}, {'end': 2720.851, 'text': "So I'll go to my Wi-Fi connection.", 'start': 2719.45, 'duration': 1.401}, {'end': 2721.831, 'text': 'I go to Advanced.', 'start': 2721.051, 'duration': 0.78}, {'end': 2722.912, 'text': 'I go to DNS.', 'start': 2722.091, 'duration': 0.821}, {'end': 2725.413, 'text': "So the Pihole's IP address is 10.0.1.9.", 'start': 2723.452, 'duration': 1.961}, {'end': 2725.653, 'text': 'So 10.0.1.9.', 'start': 2725.413, 'duration': 0.24}, {'end': 2726.313, 'text': "I'm going to hit OK.", 'start': 2725.653, 'duration': 0.66}, {'end': 2727.394, 'text': "I'm going to hit Apply.", 'start': 2726.333, 'duration': 1.061}, {'end': 2728.574, 'text': "I'm going to cancel out.", 'start': 2727.414, 'duration': 1.16}, {'end': 2743.671, 'text': 'And then when I refresh, We get a much cleaner website.', 'start': 2728.634, 'duration': 15.037}, {'end': 2744.832, 'text': 'We get a much cleaner website.', 'start': 2743.711, 'duration': 1.121}], 'summary': 'Using pihole for dns services results in cleaner website with disappearance of unwanted content.', 'duration': 32.525, 'max_score': 2712.307, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2712307.jpg'}], 'start': 2548.184, 'title': 'Using pyhole and pihole for ad-free browsing on ubuntu', 'summary': 'Discusses using pyhole to turn an ubuntu machine into a dns appliance, blocking dns resolution to advertising domains, leading to improved performance and privacy protection on websites like cnn.com. it also explains how to use pihole for dns services, resulting in a much cleaner website with decreased advertisements and highlights the advantages of using dns over ad blockers for a better browsing experience.', 'chapters': [{'end': 2710.963, 'start': 2548.184, 'title': 'Pyhole: blocking ads on ubuntu', 'summary': 'Discusses using pyhole to turn an ubuntu machine into a dns appliance, blocking dns resolution to advertising domains, leading to improved performance and privacy protection on websites like cnn.com.', 'duration': 162.779, 'highlights': ['Using PyHole to block DNS resolution to advertising domains can improve website load times and prevent the collection of user information. Improved website performance, prevention of user information collection', "CNN.com's website performance is negatively impacted by the presence of advertisements served by external servers, leading to slow load times and confusion for users. Slow load times, confusion for users", 'Advertisements and paid content on CNN.com are collected from external servers, impacting user experience and privacy. Impact on user experience and privacy']}, {'end': 2849.08, 'start': 2712.307, 'title': 'Using pihole for ad-free browsing', 'summary': 'Explains how to use pihole for dns services, resulting in a much cleaner website with decreased advertisements and highlights the advantages of using dns over ad blockers for a better browsing experience.', 'duration': 136.773, 'highlights': ["Pihole's IP address is 10.0.1.9, and using it for DNS services results in a much cleaner website with disappearing advertisements.", 'Pihole syncs DNS resolutions, preventing advertisements from loading, offering a better browsing experience.', 'Using Pihole for DNS services results in a cleaner web page with decreased advertisements compared to ad blockers or JavaScript blockers.']}], 'duration': 300.896, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2548184.jpg', 'highlights': ['Using PyHole to block DNS resolution to advertising domains can improve website load times and prevent the collection of user information.', "Pihole's IP address is 10.0.1.9, and using it for DNS services results in a much cleaner website with disappearing advertisements.", 'Pihole syncs DNS resolutions, preventing advertisements from loading, offering a better browsing experience.', "CNN.com's website performance is negatively impacted by the presence of advertisements served by external servers, leading to slow load times and confusion for users."]}, {'end': 3881.819, 'segs': [{'end': 2960.831, 'src': 'embed', 'start': 2930.607, 'weight': 0, 'content': [{'end': 2932.248, 'text': "just to give you an idea of what's happening.", 'start': 2930.607, 'duration': 1.641}, {'end': 2934.77, 'text': 'And then you have the top permitted ones here.', 'start': 2932.588, 'duration': 2.182}, {'end': 2941.276, 'text': "If we go over to the query log, we can get a better idea of what's actually happening.", 'start': 2934.79, 'duration': 6.486}, {'end': 2948.441, 'text': "So these are the, you know, it tells me what the client is, so 10.1.2, that's my computer, that's right there that you can't see.", 'start': 2941.696, 'duration': 6.745}, {'end': 2953.705, 'text': 'And you can see that it tried to go to signal metrics collector, beta s1tag.com.', 'start': 2948.822, 'duration': 4.883}, {'end': 2956.327, 'text': "It can say, show that it's blocked and the whole nine yards.", 'start': 2953.806, 'duration': 2.521}, {'end': 2960.831, 'text': 'Shows that it went to these IP addresses and such.', 'start': 2957.028, 'duration': 3.803}], 'summary': 'Analyzing query log reveals blocked attempt from 10.1.2, trying to access signal metrics collector, beta s1tag.com.', 'duration': 30.224, 'max_score': 2930.607, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2930607.jpg'}, {'end': 3137.629, 'src': 'embed', 'start': 3112.473, 'weight': 1, 'content': [{'end': 3119.374, 'text': "it will simply take the information that's already been cached locally and provide that to the computer on the network.", 'start': 3112.473, 'duration': 6.901}, {'end': 3121.754, 'text': "Why this is useful is it's not a lot faster.", 'start': 3119.714, 'duration': 2.04}, {'end': 3125.055, 'text': "It's a little bit faster because it is a local service versus being a public service.", 'start': 3121.834, 'duration': 3.221}, {'end': 3131.802, 'text': 'But the important thing here is it limits the amount of tracking that can be done for all of the users on your network right?', 'start': 3126.556, 'duration': 5.246}, {'end': 3137.629, 'text': 'So every time you go to a public DNS server, that information can be logged,', 'start': 3132.122, 'duration': 5.507}], 'summary': 'Local dns caching provides faster access and limits tracking for network users.', 'duration': 25.156, 'max_score': 3112.473, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA3112473.jpg'}, {'end': 3302.37, 'src': 'embed', 'start': 3277.784, 'weight': 2, 'content': [{'end': 3283.788, 'text': "The valuable thing here is now you're not going through the public DNS providers that are basically caching all of these DNS requests.", 'start': 3277.784, 'duration': 6.004}, {'end': 3287.591, 'text': 'So therefore, your information is not going to be logged in the same way.', 'start': 3284.148, 'duration': 3.443}, {'end': 3290.093, 'text': 'The one problem with this is that this can be slower.', 'start': 3287.931, 'duration': 2.162}, {'end': 3291.514, 'text': "Now, here's the big thing.", 'start': 3290.113, 'duration': 1.401}, {'end': 3298.078, 'text': 'What is slower? I get this question like, well, Eli, Unbound is slower.', 'start': 3292.634, 'duration': 5.444}, {'end': 3301.068, 'text': "Should I use it? I don't know.", 'start': 3298.178, 'duration': 2.89}, {'end': 3302.37, 'text': 'Depends on your infrastructure.', 'start': 3301.088, 'duration': 1.282}], 'summary': 'Using unbound for dns can offer privacy but may result in slower performance based on infrastructure.', 'duration': 24.586, 'max_score': 3277.784, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA3277784.jpg'}], 'start': 2849.48, 'title': 'Network administration tools', 'summary': "Covers pi-hole's role in network administration, its features, and benefits as an alternative to traditional dns servers, unbound's privacy enhancement and opendns's content filtering capabilities, highlighting their impact on network security and privacy.", 'chapters': [{'end': 3169.111, 'start': 2849.48, 'title': 'Understanding pi-hole for network administration', 'summary': 'Explains how pi-hole works as a network administration tool, allowing users to monitor and control network traffic, and cache dns requests locally to improve speed and privacy, with the ability to whitelist and blacklist domains, presenting a valuable alternative to traditional dns servers.', 'duration': 319.631, 'highlights': ['Pi-hole can monitor and control network traffic, providing valuable statistics and reports such as total queries, query types, top blocked and permitted domains, aiding administrators in understanding network usage. total queries over the past 24 hours, query types, top blocked domains, top permitted domains', "Pi-hole's ability to cache DNS requests locally helps improve speed and privacy, preventing forwarding requests to public DNS servers and limiting tracking for network users. Pi-hole caches 10,000 DNS requests", 'Pi-hole allows whitelisting and blacklisting of domains, providing control over which domains are permitted or blocked, offering a valuable alternative to traditional DNS servers. Ability to whitelist and blacklist domains']}, {'end': 3700.881, 'start': 3169.692, 'title': 'Unbound dns and opendns', 'summary': 'Discusses the benefits of using unbound as a recursive dns server to enhance privacy and the features of opendns for content filtering, with emphasis on its customization options and dynamic dns service.', 'duration': 531.189, 'highlights': ["Unbound DNS is a recursive server that goes up to authoritative name servers, enhancing privacy by avoiding public DNS providers' caching and logging of DNS requests. Unbound DNS server goes up to authoritative name servers, avoiding public DNS providers' caching and logging of DNS requests, thus enhancing privacy.", 'OpenDNS offers content filtering to block nefarious domains, such as porn, peer-to-peer file sharing, and social media sites, and provides customization options for filtering policies. OpenDNS provides content filtering to block nefarious domains like porn, peer-to-peer file sharing, and social media sites, with customizable filtering policies.', 'OpenDNS features dynamic DNS service for updating IP addresses, enabling constant updates for dynamic IP addresses. OpenDNS offers dynamic DNS service for updating IP addresses, ensuring constant updates for dynamic IP addresses.']}, {'end': 3881.819, 'start': 3700.881, 'title': 'Opendns and content filtering', 'summary': 'Discusses how opendns performs dns poisoning to block access to inappropriate websites, such as sex.com and pornhub.com, and how this can help businesses prevent legal issues and maintain a secure network environment.', 'duration': 180.938, 'highlights': ['OpenDNS performs DNS poisoning to block access to inappropriate websites like sex.com and pornhub.com. DNS poisoning is used to prevent access to specific websites, such as sex.com, by redirecting the request and breaking SSL connections.', 'Businesses can use OpenDNS to prevent employees from accessing inappropriate websites during work hours, reducing the risk of legal issues and maintaining a secure network environment. Implementing content filtering with OpenDNS can help businesses prevent employees from accessing inappropriate websites like pornhub.com during work hours, reducing the risk of legal issues and maintaining a secure network environment.', 'OpenDNS allows administrators to monitor and identify attempts to access blocked websites, enabling proactive measures to address potential issues, such as sexual harassment lawsuits. OpenDNS provides administrators with the ability to monitor and identify attempts to access blocked websites, allowing proactive measures to be taken to address potential issues, such as sexual harassment lawsuits, before they escalate.']}], 'duration': 1032.339, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA2849480.jpg', 'highlights': ['Pi-hole can monitor and control network traffic, providing valuable statistics and reports such as total queries, query types, top blocked and permitted domains, aiding administrators in understanding network usage.', "Unbound DNS is a recursive server that goes up to authoritative name servers, enhancing privacy by avoiding public DNS providers' caching and logging of DNS requests.", 'OpenDNS offers content filtering to block nefarious domains, such as porn, peer-to-peer file sharing, and social media sites, and provides customization options for filtering policies.']}, {'end': 4562.152, 'segs': [{'end': 3959.119, 'src': 'embed', 'start': 3924.582, 'weight': 6, 'content': [{'end': 3927.324, 'text': "That's supposed to be a new form of security for DNS.", 'start': 3924.582, 'duration': 2.742}, {'end': 3933.269, 'text': 'I will definitely take a look at DNSSEC so I can talk about it in this DNS for cybersecurity class.', 'start': 3927.444, 'duration': 5.825}, {'end': 3937.872, 'text': "And basically what I found out when I was doing my research is it's a mess.", 'start': 3933.669, 'duration': 4.203}, {'end': 3940.394, 'text': 'DNSSEC is a mess.', 'start': 3939.113, 'duration': 1.281}, {'end': 3941.555, 'text': 'Oh boy.', 'start': 3941.175, 'duration': 0.38}, {'end': 3947.676, 'text': 'So basically what DNSSEC is supposed to do is for spoofing or poisoning DNS.', 'start': 3941.855, 'duration': 5.821}, {'end': 3950.717, 'text': 'So imagine if somebody can do a man-in-the-middle attack.', 'start': 3947.956, 'duration': 2.761}, {'end': 3959.119, 'text': "If you do a DNS request, they're able to quash the incoming response for DNS and basically put in their own DNS response.", 'start': 3950.817, 'duration': 8.302}], 'summary': 'Dnssec is a mess, meant to stop dns spoofing and man-in-the-middle attacks.', 'duration': 34.537, 'max_score': 3924.582, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA3924582.jpg'}, {'end': 4017.495, 'src': 'embed', 'start': 3992.787, 'weight': 5, 'content': [{'end': 4001.272, 'text': "So essentially, when you connect to a DNS server, the DNS server will assign the information, the DNS request that it's giving back to you.", 'start': 3992.787, 'duration': 8.485}, {'end': 4012.512, 'text': 'the DNS request came from, who it was supposed to come from.', 'start': 4009.289, 'duration': 3.223}, {'end': 4017.495, 'text': 'The problem is, is when you get into this, is a whole bunch of people have to play nice.', 'start': 4012.932, 'duration': 4.563}], 'summary': 'Dns server assigns and tracks requests, but cooperation is vital.', 'duration': 24.708, 'max_score': 3992.787, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA3992787.jpg'}, {'end': 4066.97, 'src': 'embed', 'start': 4042.554, 'weight': 1, 'content': [{'end': 4048.218, 'text': "It's just like, even simply trying to figure out which browsers fully support DNSSEC can be a bit of a disaster.", 'start': 4042.554, 'duration': 5.664}, {'end': 4050.399, 'text': 'So DNSSEC is one of those.', 'start': 4048.638, 'duration': 1.761}, {'end': 4051.92, 'text': 'It may come, it may not.', 'start': 4050.72, 'duration': 1.2}, {'end': 4056.243, 'text': 'There are some people out there arguing that DNSSEC actually makes security worse with DNS.', 'start': 4051.98, 'duration': 4.263}, {'end': 4057.945, 'text': "I wouldn't be out in that rabbit hole.", 'start': 4056.744, 'duration': 1.201}, {'end': 4059.205, 'text': 'Not going to explain it here.', 'start': 4058.205, 'duration': 1}, {'end': 4063.165, 'text': "But so, if you're interested in DNSSEC, Go take a look at it.", 'start': 4059.446, 'duration': 3.719}, {'end': 4066.97, 'text': "If you can figure out why it's not a mess, I'd be happy to hear why it's not a mess.", 'start': 4063.666, 'duration': 3.304}], 'summary': 'The challenges of dnssec support in browsers are discussed, with potential security concerns raised.', 'duration': 24.416, 'max_score': 4042.554, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA4042554.jpg'}, {'end': 4123.076, 'src': 'embed', 'start': 4095.232, 'weight': 4, 'content': [{'end': 4099.035, 'text': 'Like in order for me to get an update, my computer may have to authenticate with a different server.', 'start': 4095.232, 'duration': 3.803}, {'end': 4109.964, 'text': "the update server but don't whitelist the authentication server and then my updates fail because when I go to authenticate that I'm allowed to download something that doesn't work.", 'start': 4100.895, 'duration': 9.069}, {'end': 4116.029, 'text': 'So one of the things to be thinking about is whenever you set up DNS security, you really have to talk with your users.', 'start': 4110.325, 'duration': 5.704}, {'end': 4117.31, 'text': 'You have to talk with your clients.', 'start': 4116.05, 'duration': 1.26}, {'end': 4123.076, 'text': 'You have to talk with anybody that is using your infrastructure and verify that everything is working properly.', 'start': 4117.47, 'duration': 5.606}], 'summary': 'Dns security setup requires user verification to avoid update failures.', 'duration': 27.844, 'max_score': 4095.232, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA4095232.jpg'}, {'end': 4230.593, 'src': 'embed', 'start': 4203.029, 'weight': 2, 'content': [{'end': 4208.697, 'text': 'do their work and so the business is burning into the ground because of what you implemented.', 'start': 4203.029, 'duration': 5.668}, {'end': 4215.246, 'text': "Again, remember whenever you're dealing with security, you can do as much damage as you do good simply by the configuration.", 'start': 4208.777, 'duration': 6.469}, {'end': 4221.986, 'text': 'So whenever you start configuring DNS, Again, talk with everybody, talk with everybody, verify that it works.', 'start': 4215.266, 'duration': 6.72}, {'end': 4230.593, 'text': 'Sit behind your customer service reps and say, hey, I just want to see you input information and verify that it works properly.', 'start': 4222.366, 'duration': 8.227}], 'summary': 'Implementing security measures without proper configuration can harm the business operations and customer service.', 'duration': 27.564, 'max_score': 4203.029, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA4203029.jpg'}, {'end': 4289.258, 'src': 'embed', 'start': 4261.507, 'weight': 3, 'content': [{'end': 4265.688, 'text': 'A lot of them understand things like DNS and default gateways and VPNs and all that kind of stuff.', 'start': 4261.507, 'duration': 4.181}, {'end': 4273.697, 'text': 'So, if you have a computer and they are able to change their network settings, Even if you create this amazing DNS infrastructure,', 'start': 4266.208, 'duration': 7.489}, {'end': 4281.474, 'text': 'if they simply go in and plug in 8.8.8.8, Well they just bypassed all that infrastructure you just built right?', 'start': 4273.697, 'duration': 7.777}, {'end': 4286.196, 'text': 'So something to be thinking about security policies, that type of thing on the individual computers.', 'start': 4281.774, 'duration': 4.422}, {'end': 4289.258, 'text': 'are the individual users able to modify their DNS?', 'start': 4286.196, 'duration': 3.062}], 'summary': 'Individual users can bypass dns infrastructure by changing network settings, highlighting the importance of security policies.', 'duration': 27.751, 'max_score': 4261.507, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA4261507.jpg'}, {'end': 4331.198, 'src': 'embed', 'start': 4298.522, 'weight': 0, 'content': [{'end': 4300.002, 'text': "And then they're going to tell everybody else.", 'start': 4298.522, 'duration': 1.48}, {'end': 4302.644, 'text': "And then all of a sudden it's going to be a mess again.", 'start': 4300.383, 'duration': 2.261}, {'end': 4304.004, 'text': 'So be careful with that.', 'start': 4303.144, 'duration': 0.86}, {'end': 4307.472, 'text': 'The other thing to realize too, is do you think about how DNS works?', 'start': 4304.224, 'duration': 3.248}, {'end': 4316.334, 'text': "Again, with DNS, if you have a local network and you're getting resources from the local network, you have a print server, you have a file server,", 'start': 4307.652, 'duration': 8.682}, {'end': 4318.255, 'text': 'you have an email server that type of thing.', 'start': 4316.334, 'duration': 1.921}, {'end': 4323.936, 'text': 'do remember that your local computers have to resolve those local IP addresses too.', 'start': 4318.255, 'duration': 5.681}, {'end': 4331.198, 'text': 'So if you point all of your local computers to 8.8.8.8, guess what? 8.8.8.8 has the information for CNN.com.', 'start': 4324.276, 'duration': 6.922}], 'summary': 'Be cautious when configuring dns for local network to avoid conflicts and disruptions.', 'duration': 32.676, 'max_score': 4298.522, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA4298522.jpg'}, {'end': 4557.228, 'src': 'heatmap', 'start': 4516.059, 'weight': 0.891, 'content': [{'end': 4519.241, 'text': 'feel free to take this presentation from SiliconDojo.com.', 'start': 4516.059, 'duration': 3.182}, {'end': 4523.503, 'text': 'You can take the keynotes, you can take the outline, you can take all the information that you want.', 'start': 4519.261, 'duration': 4.242}, {'end': 4525.784, 'text': 'You can take that, you can create your own presentation.', 'start': 4523.903, 'duration': 1.881}, {'end': 4531.408, 'text': 'That is something that I think is one of the most valuable things about Silicon Dojo is I want this to be replicatable.', 'start': 4525.824, 'duration': 5.584}, {'end': 4535.07, 'text': 'This is not simply about what I can do here in Asheville.', 'start': 4531.668, 'duration': 3.402}, {'end': 4539.593, 'text': "It's about what can I do here and create the resources.", 'start': 4535.37, 'duration': 4.223}, {'end': 4544.997, 'text': "So, if you're somewhere else, if you're in Cleveland, if you're in New York, if you're in Mogadishu,", 'start': 4539.973, 'duration': 5.024}, {'end': 4553.064, 'text': "you can take basically what I've created you know, change it, modify it for your particular needs and you can teach people you know,", 'start': 4544.997, 'duration': 8.067}, {'end': 4554.205, 'text': "whoever that you're dealing with.", 'start': 4553.064, 'duration': 1.141}, {'end': 4557.228, 'text': 'So, please take this and run with it.', 'start': 4554.445, 'duration': 2.783}], 'summary': 'Silicon dojo encourages replication of its resources worldwide.', 'duration': 41.169, 'max_score': 4516.059, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA4516059.jpg'}], 'start': 3882.139, 'title': 'Dns security best practices', 'summary': 'Emphasizes the importance of user verification and communication, warns about potential issues caused by employee reluctance to report problems, highlights the risk of users bypassing security measures, and stresses the significance of local dns resolution for internal resources.', 'chapters': [{'end': 4109.964, 'start': 3882.139, 'title': 'Dns security and dnssec', 'summary': 'Discusses the capabilities of opendns, owned by cisco, as a valuable tool, and highlights the challenges and complexities of dnssec, a new form of security for dns, emphasizing the need for browsers and dns servers to support it.', 'duration': 227.825, 'highlights': ['DNSSEC is a mess, intended for preventing spoofing or poisoning DNS, but it faces challenges due to the necessity for browsers and DNS servers to support it.', 'OpenDNS, owned by Cisco, is a highly recommended service for enterprise and business use, with a history of 15 years in the industry.', 'DNS security issues can lead to unexpected problems, such as computers resolving to unknown domains and failed updates due to authentication server issues.']}, {'end': 4562.152, 'start': 4110.325, 'title': 'Dns security best practices', 'summary': 'Emphasizes the importance of user verification and communication in dns security, warns about potential issues caused by employee reluctance to report problems, highlights the risk of users bypassing security measures, and stresses the significance of local dns resolution for internal resources.', 'duration': 451.827, 'highlights': ['The importance of user verification and communication in DNS security Emphasizes the need to talk with users and clients to ensure proper functioning of DNS security policies.', 'Potential issues caused by employee reluctance to report problems Warns about the risks of employees not reporting system breakdowns, impacting their ability to work and potentially leading to business decline.', 'Risk of users bypassing security measures by modifying DNS settings Highlights the threat of users bypassing DNS security infrastructure by changing their network settings, potentially compromising security measures.', 'Significance of local DNS resolution for internal resources Stresses the importance of local DNS resolution for accessing internal resources, cautioning against pointing all local systems to external DNS servers.']}], 'duration': 680.013, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/Ah5wBBRArKA/pics/Ah5wBBRArKA3882139.jpg', 'highlights': ['OpenDNS, owned by Cisco, is a highly recommended service for enterprise and business use, with a history of 15 years in the industry.', 'The importance of user verification and communication in DNS security Emphasizes the need to talk with users and clients to ensure proper functioning of DNS security policies.', 'Risk of users bypassing security measures by modifying DNS settings Highlights the threat of users bypassing DNS security infrastructure by changing their network settings, potentially compromising security measures.', 'Significance of local DNS resolution for internal resources Stresses the importance of local DNS resolution for accessing internal resources, cautioning against pointing all local systems to external DNS servers.', 'Potential issues caused by employee reluctance to report problems Warns about the risks of employees not reporting system breakdowns, impacting their ability to work and potentially leading to business decline.', 'DNS security issues can lead to unexpected problems, such as computers resolving to unknown domains and failed updates due to authentication server issues.', 'DNSSEC is a mess, intended for preventing spoofing or poisoning DNS, but it faces challenges due to the necessity for browsers and DNS servers to support it.']}], 'highlights': ['Pi-Hole is a DNS device that enhances internet communication security.', 'OpenDNS is a tool for securing systems using DNS.', 'LibreOffice Draw allows for creating cybersecurity diagrams.', 'DNS resolution involves host file, local DNS server, and external DNS servers.', 'DNS tracking raises privacy concerns and can compromise user privacy.', 'DNS security measures are crucial in preventing unauthorized access.', 'DNS can block specific site access, enhancing network security and control.', 'Host file can be manipulated to redirect website requests for security.', 'Using DNS configurations is significant for customizing settings and privacy.', "Fingerprinting involves advertisers tracking users' activities based on unique identifiers.", "Using Google's public DNS servers is recommended for improved performance and privacy.", 'Cloudflare launches public DNS service prioritizing privacy and security.', 'Pixel trackers collect user information and enable tracking of web browser activities.', 'Pi-hole can prevent pixel tracking and enhance website performance.', 'Using Pi-hole to block DNS resolution to advertising domains improves website load times.', 'Pi-hole can monitor and control network traffic, providing valuable statistics and reports.', "Unbound DNS enhances privacy by avoiding public DNS providers' caching and logging.", 'OpenDNS offers content filtering to block nefarious domains and provides customization options.', 'OpenDNS is highly recommended for enterprise and business use.', 'The importance of user verification and communication in DNS security.', 'Risks of users bypassing security measures by modifying DNS settings.', 'Significance of local DNS resolution for internal resources.', 'Potential issues caused by employee reluctance to report problems.', 'DNS security issues can lead to unexpected problems and failed updates.', 'DNSSEC faces challenges due to the necessity for browsers and DNS servers to support it.']}