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

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Chapter 12

A1: The default route address is 0.0.0.0.
A2: IGRP and EIGRP advertise a default address as an external address type.
A3: Yes.
A4: A stub router is a router with only a single link to another router. A stub network is a network with only one attached router.
A5: Using a default route rather than a full routing table can conserve router memory by keeping the table small and can save router processing cycles by limiting the routing information that must be processed.
A6: Using a full routing table rather than a default route can make routing more accurate.
A7: ODR uses Cisco Discovery Protocol (CDP) to discover routes.
A8: ODR is available in IOS 11.2 and later.
A9: The medium over which ODR is to run must support SNAP.

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