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

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Chapter 9

A1: Either the IP address or the mask is misconfigured on one of the neighboring interfaces.
A2: One router is configured as a stub area router, and the other is not.
A3: The receiving router is configured for MD5 (type 2) authentication, and the neighbor has no authentication configured (type 0).
A4: The passwords configured on the two routers do not match.
A5: The neighboring interfaces are not configured with the same area ID.
A6: RTA's network statements are in the wrong order. The first statement matches IP address 192.168.50.242 and puts it in area 192.168.50.0.
A7: Link ID 10.8.5.1 is the most likely suspect because its sequence number is substantially higher than the sequence numbers of the other links.

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