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Part IV: Application Level > Chapter 19: The Domain Name System

CHAPTER 19 The Domain Name System

What You Will Learn

In this chapter, you will learn how DNS gives the Internet a more user-friendly way to access resources. We’ll see how names are associated with IP addresses and how applications find this information.

You will learn how DNS servers provide information about local networks, and how this information is distributed and shared on the Internet. We’ll also use show tools to help examine DNS.

The Domain Name System (DNS) is the distributed database used by the TCP/IP protocol suite to translate hostnames to IP addresses (both IPv4 and IPv6) and provide related information, such as email routing information. DNS has been around as part of the Internet for so long that it is easy to forget that in the early days users needed a file named /etc/hosts (no extension) unless they wanted to type in the 32-bit IP address that went along with the hostname.


  

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