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

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Chapter 8

A1: No further configuration is necessary, because automatic summarization is still enabled at Earhart.
A2: The EIGRP configurations are:

RTA

router eigrp 5 network 172.16.0.0 network 172.18.0.0

RTB

router eigrp 5 network 172.16.0.0

RTC

router eigrp 5 network 172.16.0.0 network 172.17.0.0
A3: This solution uses a key chain named CCIE and key strings named exercise3a and exercise3b. Assuming today's date is November 30, 1998, and the first key begins being used at 8:30 AM, the configurations of the serial interfaces are:
key chain CCIEkey 1 key-string exercise3a accept-lifetime 08:30:00 Dec 2 1998 08:30:00 Jan 1 1999 send-lifetime 08:30:00 Dec 2 1998 08:30:00 Jan 1 1999key 2 key-string exercise3b accept-lifetime 08:30:00 Jan 1 1999 infinite ...

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