October 2002
Intermediate to advanced
344 pages
10h 17m
English
Content preview from The ABCs of TCP/IP, 2nd Edition
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The Internet Protocol and Related Protocols
63
assigned to a Class A network, Class A addresses were primarily assigned to
large organizations and countries that have national networks.
Loopback
One Class A network address that warrants attention results from the setting
of all seven bits in the network address to 1, representing 127 in decimal. A
network address of 127.x.x.x is reserved as an internal loopback address and
cannot be assigned as a unique IP address to a host. Thus, a question one
may have is, “why reserve a network address of 127 if it is not usable?” The
answer to this question is the fact that one can use a network address of
127.x.x.x as a mechanism to determine if one’s computer that loaded TCP/IP
protocol stack has an operational ...
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