The IS-IS neighbor between R3 and R1 is not established. According to the information in this figure, what is the possible cause?

The IS-IS neighbor between R3 and R1 is not established. According to the information in this figure, what is the possible cause?

A . The IIH certification of R3 and R1 failed
B . The System ID of R3 and R1 are duplicated
C . The lS-Level of R3 and R1 do not match
D . The circuit-type of the interconnection interface between R3 and R1 does not match

View Answer

Answer: A