Cisco Implementing and Operating Cisco Service Provider Network Core Technologies (350-501 SPCOR) 350-501 Question # 95 Topic 10 Discussion
350-501 Exam Topic 10 Question 95 Discussion:
Question #: 95
Topic #: 10
Refer to the exhibits:
R1 and R2 are directly connected and IS-IS routing has been enabled between R1 and R2 R1 message periodically Based on this output, which statement is true?
A.
IS-IS neighbor authentication is failing for Level 2 first and then for Level 1 PDUs
B.
1S-1S neighbor authentication is failing for Level 1 and Level 2 PDUs .
C.
IS-IS neighbor authentication is failing for Level 1 PDUs only
D.
IS-IS neighbor authentication is failing for Level 2 PDUs only.
The error message “%CLNS-4-AUTH_FAIL: ISIS: LAN LIIH authentication failed” indicates that there is an authentication failure in the IS-IS routing protocol between routers R1 and R2. In the exhibit, it can be observed that R2 has a state of “UP” for its IS-IS neighbor relationship, while R1 is in “INIT” state. This discrepancy in states indicates an issue with the establishment of the neighbor relationship, which can be attributed to an authentication failure at both Level 1 and Level 2 PDUs as indicated by option B.
[: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) official guide or documentation available on Cisco’s official website., ]
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