Cisco 400-051 Exam

Refer to the exhibit. Assuming this NFAS-enabled T1 PRI configuration on a Cisco IOS router is fully functional, what will the controller T1 1/1 D-channel status be in the output of the show isdn status command?

  • A. MULTIPLE_FRAME_ESTABLISHED
  • B. TEI_ASSIGNED
  • C. AWAITING_ESTABLISHMENT
  • D. STANDBY
  • E. INITIALIZED
Answer: Option B.
Explanation: 

TEI_ASSIGNED, which indicates that the PRI does not exchange Layer 2 frames with the switch. Use the show controller t1x command to first check the controller t1 circuit, and verify whether it is clean (that is, it has no errors) before you troubleshoot ISDN Layer 2 problem with the debug isdn q921.

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