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Cisco 642-427 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Advanced Features and Applications | 20% | - Media resources, voice quality, and QoS issues - Extension Mobility Cross Cluster - Call Control Discovery (CCD) and SAF |
| Integrated Solution Troubleshooting | 10% | - Presence and IM service troubleshooting - Unity Connection integration issues |
| Call Setup and Dial Plan Troubleshooting | 25% | - Dial plan, route patterns, partitions, CSS, translation rules - Intrasite, intersite, and off-net call failures - Globalized call routing and number transformation |
| Troubleshooting Methodology and Tools | 20% | - Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs - Systematic troubleshooting approach |
| CUCM and Registration Troubleshooting | 25% | - Gateway and trunk registration (SIP, H.323, MGCP) - CUCM service availability and database replication - Endpoint and IP phone registration issues |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Question #1
You need to collect debug information in a production environment on urgent basis to troubleshoot a problem. Which two commands are recommended by Cisco that you should run? (Choose two.)
A. logging buffered
B. undebug all
C. no debug all
D. show logging info
E. show debug
F. no logging console
Question #2
Which step do you take after you gather all the facts to troubleshoot poor audio quality?
A. Implement the solution.
B. Create an action plan.
C. Consider all the possibilities.
D. Observe the results.
Question #3
Which of these is used by the Cisco IP phone to relay to the switch the information regarding how much power is needed?
A. IEEE 802.10 protocol
B. The switch model determines how much power is consumed by the different phone models
C. the Cisco Discovery Protocol
D. Cisco IP phones always use a fixed power consumption hased on the resistor, which is specific to the model
Question #4
Refer to the topology exhibit.
When the Cisco Unified Communications Manager at the BR1 site loses connectivity to the SAF network, the call to extension 3001 fails to reroute via the PSTN. Examine the SDI trace in the exhibit. What is the most likely cause of the failure?
A. CCD requesting service does not have the correct partition configured for CCD learned patterns
B. The full E.164 number for extension 3001 could not be constructed.
C. The AAR CSS for the HQ phone does not have access to the \\ route pattern.
D. The calling phone line CSS does not have access to the V route pattern.
E. The Cisco Unified Communications Manager at the HQ site was unable to determine the ToDlD number to extension 3001.
Question #5
How does the echo canceller interpret a signal when the ERL value is too low?
A. The echo canceller considers the signal returning to the gateway as comfort noise generated during periods of silence and does not act on it.
B. The echo signal retuning to the gateway is too loud and the echo canceller interprets it as normal voice instead of echo.
C. The echo canceller will apply the maximum echo-cancel coverage time to the signal to determine if this is echo or voice.
D. The echo canceller treats the signal as echo and applies the configured values.
Solutions:
| Question #1 Correct Answer: A,F | Question #2 Correct Answer: C | Question #3 Correct Answer: C | Question #4 Correct Answer: C | Question #5 Correct Answer: B |
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