You have created a new IS-IS adjacency between identical routers over two STM-4 circuits. After enabling no-keepalives on the interfaces, they come up and you are able to ping between the routers. However, the IS-IS adjacency still will not establish.
Which step will determine the cause of the problem?
A. Disable no-keepalives from the interfaces and issue a show isis adjacency command.
B. Enable family iso on all the SONET interfaces, commit, and test the circuits.
C. Disable cisco-hdlc encapsulation, enable ppp encapsulation, commit, and test the circuits.
D. Disable no-keepalives from the interfaces and issue a show interfaces extensive command for each of the SONET interfaces.
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