Refer to the exhibits. R1 and R2 are directly connected and IS-IS routing has been enabled between R1 and R2. R1 generates the above log message periodically. Based on this output, which statement is true?
A) IS-IS neighbor authentication is failing for Level 2 PDUs only.
B) IS-IS neighbor authentication is failing for Level 2 first and then for Level 1 PDUs.
C) IS-IS neighbor authentication is failing for Level 1 and Level 2 PDUs.
D) IS-IS neighbor authentication is failing for Level 1 PDUs only.

Question

Refer to the exhibits. R1 and R2 are directly connected and IS-IS routing has been enabled between R1 and R2. R1 generates the above log message periodically. Based on this output, which statement is true?
A) IS-IS neighbor authentication is failing for Level 2 PDUs only. 
B) IS-IS neighbor authentication is failing for Level 2 first and then for Level 1 PDUs. 
C) IS-IS neighbor authentication is failing for Level 1 and Level 2 PDUs. 
D) IS-IS neighbor authentication is failing for Level 1 PDUs only.

Quizplus · Accepted Answer

The Answer of  Refer to the exhibits. R1 and R2 are directly connected and IS-IS routing has been enabled between R1 and R2. R1 generates the above log message periodically. Based on this output, which statement is true?
A) IS-IS neighbor authentication is failing for Level 2 PDUs only. 
B) IS-IS neighbor authentication is failing for Level 2 first and then for Level 1 PDUs. 
C) IS-IS neighbor authentication is failing for Level 1 and Level 2 PDUs. 
D) IS-IS neighbor authentication is failing for Level 1 PDUs only.

Refer to the Exhibits