3 Domain Name System
This chapter covers
- How Uniform Resource Locators identify a resource and how to access it
- The hierarchical structure of the Domain Name System
- The DNS name resolution process
- Implementing a DNS on Cisco IOS devices
“What’s in a name?” Ask that to a computer, and you’ll learn that the answer is a number. Although we humans like to use memorable names to refer to the resources we access over a network (i.e., websites), computers use numbers—IP addresses—to identify each other. So when you type a name like “www.google.com” into a web browser’s address bar, how does your computer learn the IP address of the server that hosts Google’s website?
The answer is the Domain Name System (DNS). Using DNS, your computer resolves—or ...
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