O'Reilly logo

CCENT/CCNA ICND1 100-101 Official Cert Guide by Wendell Odom

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Using Names and the Domain Name System

Can you imagine a world in which every time you used an application, you had to think about the other computer and refer to it by IP address? Instead of using easy names like google.com or facebook.com, you would have to remember and type IP addresses, like 74.125.225.5. Certainly, that would not be user friendly and could drive some people away from using computers at all.

Thankfully, TCP/IP defines a way to use host names to identify other computers. The user either never thinks about the other computer or refers to the other computer by name. Then, protocols dynamically discover all the necessary information to allow communications based on that name.

For example, when you open a web browser and type ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required