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Refer to the exhibit. All routers interfaces are up/up and configured with EIGRP. For some reason one router is unable to become an EIGRP neighbor. Which router is causing the problem and what can be the cause?
Serial 1/1 on router R2 is incorrectly configured.
R3s interfaces IP addresses are configured on wrong subnets.
Router R1 subnet mask is mismatching.
Serial 1/0 on R2 is not configured correctly, causing the entire network to not converge.
R4s interfaces are configured on wrong subnets.
Many times an EIGRP router wont be able to establish neighbor relationship because they are not in the same subnet. In this case both interfaces on R3 are on different subnets related to R1 and R4. R3 Serial1/1 has to be re-configured to 172.16.100.37 and Serial1/0 has to be re-configured to 172.16.100.25/30.
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