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About DNS
Domain Name System (DNS) servers map the user-friendly
domain names that users type into their Web browsers
(e.g. yahoo.com) to the equivalent numerical IP addresses
that are used for Internet routing.
When a PC user types a domain name into a browser, the PC
must first send a request to a DNS server to obtain the equivalent
IP addresses. The DNS server will attempt to look up the domain
name in its own database, and will communicate with higher-level
DNS servers when the name cannot be found locally. When the
address is found, it is sent back to the requesting PC and is
referenced in IP packets for the remainder of the communication.
Assigning DNS Addresses
Multiple DNS addresses are useful to provide alternatives when
one of the servers is down or is encountering heavy traffic. ISPs
typically provide primary and secondary DNS addresses, and
may provide additional addresses. Your LAN PCs learn these
DNS addresses in one of the following ways:
•
Statically:
If your ISP provides you with their DNS server addresses,
you can assign them to each PC by modifying the PCs'
IP properties.