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The IS-IS Level-1 neighbor relationship between R3 and R4 is not established.
[R3] display isis error
Hell packet errors ：
... ...
Repeated System ID ： 0 Bad Circuit Type ： 0
Bad TLV Length ： 0 Zer Holding Time ： 0
Unusable IP Addr ： 0 Repeated IPV4 Addr ： 0
Mismatched Area Addr （ L1 ）： 13 Mismatched Prot ： 0
SNPA Conflicted （ LAN ）： 0 Mismatched Level ： 0
Mismatched Max Area Addr ： 0 Bad Authentication ： 0
... ...
[R3]
Based on the information in this graph, which of the following is the likely cause?
- A . The IIH authentication of R3 and R1 failed
B. The circuit-type of the interconnection interface of R3 and R4 does not match
C. The IS-Level of R3 and R4 do not match
D. The area numbers of R3 and R4 are different
Suggested Answer: D
Posted : 11/01/2023 3:06 am