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Refer to the exhibit. The network has been configured with EIGRP; Router R1 and R2 form a neighbor relationship, however there is a routing loop which is limiting communication. Which of the following might be the source of the problem?
Too many CRC errors.
Clock is not set.
Loopback is not set.
A simple mismatch in the subnet masks can cause a routing loop. Initially EIGRP will normally form the neighbor relationship between R1 and R2 because 172.16.100.29 and 172.16.100.30 are in the same subnet. However the routing loop starts when either R1 or R2 form a neighbor relationship with another router and start to exchange EIGRP topology tables and install routes based on the EIGRP topology table. A /29 route will override the /30 route, because it is more specific. When another router with /30 subnet joins as a neighbor it will create a routing loop.
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