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

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Chapter 10

A1: Although IS-IS has formed an adjacency, the IP addresses are not on the same subnet and therefore the interfaces do not pass traffic.
A2: The router sends only L1 Hellos, indicating that it is an 5 L1 router. It receives only L2 Hellos from 0000.3090.c7df, indicating that it is an L2 router.

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