Go back to 640-816 - ICND2 - Interconnecting Cisco Networking Devices Part 2

Question :-

A Cisco router that was providing Frame Relay connectivity at a remote site was replaced with a different vendor's frame relay router. Connectivity is now down between the central and remote site. What is the most likely cause of the problem?
mismatched LMI types
incorrect DLCI
mismatched encapsulation types
incorrect IP address mapping

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