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RIP Version 1 (RIP-1) Message Format
(Page 3 of 3)
RIP-1 Version-Specific Features
Since RIP version 1 was the first
version of the protocol, its features formed the basis for future RIP
versions; it doesn't really have any version-specific features. What
RIP-1 has is a number of limitations, such as a lack of support for
specifying classless addresses and no means for authentication. RIP
version 2 was created to address some
of RIP-1 shortcomings. As we will see in the next topic, RIP-2's features
put to good use those “Must Be Zero” bytes in the RIP-1 format.
 Key Concept: RIP-1 was the first version of the Routing Information Protocol and is the simplest in terms of operation and features. The bulk of an RIP-1 message consists of sets of RIP entries that specify route addresses and the distance to the route in hops.
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