DNS - Domain Name Service (1)

• Internet and TCP/IP service that maps network addresses , for example, 128.230.117.25, to an easy to remember names, such as merkury.npac.syr.edu

• TCP/IP tools (like telnet, ftp, smtp) access DNS to locate names and resolve them into IP addresses

• Names and numeric addresses are stored in many locations in a hierarchical structure. Each site has a domain name server that maintains information about the local hosts

• Unix: /etc/hosts

• Windows NT: \WinNT\system32\drivers\etc\hosts

127.0.0.1 localhost

128.230.117.25 merkury.npac.syr.edu merkury

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