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

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Chapter 7

A1: The statement neighbor 172.25.150.206 can be added to Taos's RIP configuration, causing Taos to unicast RIP updates to that address. This approach works only if Pojoaque's RIPv1 process complies with the rule that the unused fields of RIP messages with version numbers higher than 1 will be ignored and the rest of the packet processed.
A2: Begin by calculating the subnet(s) with the highest number of hosts. From the unused subnet bits, calculate the subnet(s) with the next-highest number of hosts, and so on. Remember that as a group of bits are used for a subnet, no subsequent subnet can begin with that same bit combination. For example, if the first subnet begins with 00, all subsequent subnets must begin with 01, 10, or 11. If ...

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