From the course: CISA Cert Prep: 5 Information Asset Protection for IS Auditors

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Domain names system

Domain names system

From the course: CISA Cert Prep: 5 Information Asset Protection for IS Auditors

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Domain names system

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- [Instructor] All right, let's talk about the Domain Name System, or DNS. So, DNS is all about resolving fully qualified domain names, or FQDNs, to IP addresses. When you want to go talk to some server out in the internet, let's say www.linkedin.com, you've got to be able to find out its IP address so that your computer can create a packet all the way from your machine to that server, to the www.linkedin.com machine. So how are you gonna find out what its IP address is? You need to do some kind of name resolution, need to resolve the name, the fully qualified domain name, www.linkedin.com, to an IP address. And that's what we use DNS for. DNS works in this hierarchical naming structure to resolve the hierarchical fully qualified domain name, www.linkedin.com, that's a hierarchical name, to an IP address, something-something.something-something-else. So, it does this by communicating with DNS servers. Now, DNS servers are authoritative for what we refer to as zones, which is a domain…

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