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

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Chapter 14

A1: Route maps are similar to access lists in that they define match criteria and an action to take in the event of a match. Route maps are different from access lists in that they not only specify match criteria but also specify set criteria. The set action can modify a route or route a packet according to the parameters of the packet.
A2: Policy routes are static routes that use route maps to determine which packets should be routed and where the packets should be routed.
A3: Route tags are fields within routing information packets that allow external information to be carried through the routing domain.
A4: Route tags have no effect on the routing protocols that carry them.

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