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210-060 · Question #55
210-060 Question #55: Real Exam Question with Answer & Explanation
The correct answer is A: Debug isdn q 931. The 'debug isdn q931' command is used to trace ISDN Q.931 call setup and teardown signaling on a PRI interface. Q.931 is the Layer 3 signaling protocol that controls call establishment, progression, and release on ISDN/PRI connections.
Question
Which command is used to troubleshoot calls as they enter and leave a PRI connection?
Options
- ADebug isdn q 931
- BShow voice call summary
- CDebug voip dialpeer
- DShow dial-peer voice summary
Explanation
The 'debug isdn q931' command is used to trace ISDN Q.931 call setup and teardown signaling on a PRI interface. Q.931 is the Layer 3 signaling protocol that controls call establishment, progression, and release on ISDN/PRI connections.
Common mistakes.
- B. 'show voice call summary' is a show command that displays a snapshot of currently active voice calls and their states - it does not provide real-time signaling message detail for PRI troubleshooting.
- C. 'debug voip dialpeer' traces dial-peer matching logic within the IOS VoIP engine and does not capture the ISDN Q.931 signaling layer used on PRI connections.
- D. 'show dial-peer voice summary' displays the configured dial peers and their statistics in a tabular format - it is a static configuration view, not a real-time signaling debugger.
Concept tested. ISDN Q.931 PRI call signaling troubleshooting
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