May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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Application Layer Protocols 253
Class: � This field identifies the protocol family. It is set to IN for Internet information; otherwise,
some other codes are used.
Type: � This field specifies the type of the recor
Value: � This field depends on the Type field and can be a domain name, a number or an ASCII
character.
Name Servers
As DNS database is very vast, it is impossible for a single server to hold information about the complete
database and respond to all queries. Even if it is done, then a failure in the single name server would
bring the whole network down. To avoid such a situation, the DNS name space is divided into many
non-overlapping ...
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