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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?

R4’s interfaces are configured on wrong subnets.

Serial 1/1 on router R2 is incorrectly configured.

R3’s 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.



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