From the course: Network Forensics
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DNS
- [Instructor] Domain Name Service or DNS is an application layer protocol at the transport layer. It uses UDP instead of TCP because it doesn't require a reliable connection. As its name suggests DNS acts like a phone directory. IP addresses are difficult to remember because they are numbers like 10.35.4.150. Can you imagine people typing a number into the URL field of a web browser? I don't even remember my kid's phone numbers. This is why we need a DNS server in the cloud somewhere converting a meaningful domain name like world wide web.linkedin.com into an IP address because network equipment only understands IP addresses unlike human beings who prefer a name like LinkedIn. Every host is set up to use a specific DNS server. Let's take a look at how my machine is set up. Type Network in the search field. Choose Check Network Status and then select Change Connection Properties. Scroll down. Do you see the line that says IPV 4 DNS Servers. We're using multiple servers here because…
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