642-892 Composite Exam
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Note 2: 642-892 Answers are not shown in demo questions.
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Demo Question 9.
One of the EliteCertify routers is configured to redistribute the interior IP networks into BGP. What are two potential consequences that can occur when dynamically learned routes from IGP protocols get redistributed into BGP? (Select two)
A. Routing loops can occur.
B. The IGP routing table is reduced.
C. External IGP learned routes might not necessarily have originated in this AS.
D. Route processing is done using process switching instead of cache switching.
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Answer: A, C
Explanation: It is fairly common to redistribute IGP routes (such as Enhanced IGRP, IGRP, IS-IS,
OSPF, and RIP routes) into BGP. However, precautions should be made when doing so.
Some of your IGP routes might have been learned from BGP (C. , so you need to use
access lists to prevent the redistribution of routes back into BGP, or else routing loops
can occur (A. . In addition, when these IGRP routes are redistributed, all of the networks
in the IGP routing table will be redistributed, including those that were learned
externally.
Reference: Using the Border Gateway Protocol for Interdomain Routing
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm
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