5.1. Introduction
Connected: An Internet Encyclopedia
5.1. Introduction
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Connected: An Internet Encyclopedia
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Requests For Comments
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RFC 1034
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5. RESOLVERS
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Next: 5.2. Client-resolver interface
5.1. Introduction
5.1. Introduction
Resolvers are programs that interface user programs to domain name
servers. In the simplest case, a resolver receives a request from a
user program (e.g., mail programs, TELNET, FTP) in the form of a
subroutine call, system call etc., and returns the desired information
in a form compatible with the local host's data formats.
The resolver is located on the same machine as the program that requests
the resolver's services, but it may need to consult name servers on
other hosts. Because a resolver may need to consult several name
servers, or may have the requested information in a local cache, the
amount of time that a resolver will take to complete can vary quite a
bit, from milliseconds to several seconds.
A very important goal of the resolver is to eliminate network delay and
name server load from most requests by answering them from its cache of
prior results. It follows that caches which are shared by multiple
processes, users, machines, etc., are more efficient than non-shared
caches.
Next: 5.2. Client-resolver interface
Connected: An Internet Encyclopedia
5.1. Introduction
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