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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Chapter 7

A1: The Route Tag field, the Subnet Mask field, and the Next Hop field are RIPv2 extensions that do not exist in RIPv1 messages. The basic format of the RIP message remains unchanged between the two versions; version 2 merely uses fields that are unused in version 1.
A2: In addition to the functions that use the new fields, RIPv2 supports authentication and multicast updates.
A3: RIPv2 uses the multicast address 224.0.0.9. Multicasting of routing messages is better than broadcasting because hosts and non-RIPv2 routers will ignore the multicast messages.
A4: When another routing protocol uses the RIPv2 domain as a transit domain, the protocol external to RIPv2 can use the Route Tag field to communicate information to its peers on the other ...

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