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Cisco 642-427 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Cisco Unified Communications Architecture Troubleshooting | - CUCM core components and services
|
| QoS and Network Integration | - Voice quality issues
|
| Endpoints and Registration Issues | - Endpoint performance issues
|
| Call Control and Dial Plan Troubleshooting | - Call routing failures
|
| Voice Gateway and Protocol Troubleshooting | - Media and codec issues
|
| Voicemail and Unified Messaging | - Cisco Unity Connection troubleshooting
|
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
In a three-party conference call, what is the total number of active streams available?
- A. 12
- B. 3
- C. 1
- D. 6
- E. 4
- F. 9
Correct Answer: D 🗳️
How does LLQ ensure that voice traffic is always expedited?
- A. The strict priority queue has a higher weight than the queues in CBWFQ. This weight allows the delay sensitive data such as voice to be dequeued and sent first.
- B. LLQ uses CBWFQ to prioritize voice traffic and dequeue the voice packets so that they can be handled first.
- C. The LLQ strict priority queue allows delay-sensitive data such as voice to be dequeued and sent first (before packets in order queue are dequeued), giving delay sensitive data preferential treatment over other traffic.
- D. LLQ adds a strict priority class to CBWQF. The class allows delay-sensitive data such as voice to be dequeued and sent first.
Correct Answer: C 🗳️
Explanation: Only visible for PassCollection members. You can sign-up / login (it's free).
Which statement indicates something that can cause an inbound PSTN call to an H.323 gateway that is configured in Cisco Unified Communications Manager to fail to ring an IP Phone?
- A. The gateway is missing the command allow-connections h323 to h323 under the voice service voip configuration.
- B. The gateway is not registered in Cisco Unified Communications Manager.
- C. The gateway IP address that is configured in Cisco Unified Communications Manager does not match the IP address that is configured at the gateway in the h323-gataway voip bind srcaddr command.
- D. The Cisco Unified Communications Manager does not have a matching route pattern to match the called number.
Correct Answer: C 🗳️
Refer to the exhibit.
Which two pieces of information can you gather from the Cisco Unified Communications Manager trace file shown in the exhibit? (Choose two)
- A. The calling number is 911
- B. The calling number is 2001
- C. The called number is 911
- D. The call did not complete
- E. The call proceeded normally
- F. The called number is 2001
Correct Answer: C,D 🗳️
Explanation: Only visible for PassCollection members. You can sign-up / login (it's free).
Users are complaining that they hear echo when they place calls to the PSTN through the HQ_PSTN gateway. The voice port configuration for the gateway is as follows:
voice-port 1/0:23
input gain -1
output attenuation 1
echo-cancel erl worst-case 3
Why are users hearing echo?
Select the best response.
- A. The echo canceller should be configured so that SIN and SOUT have a 2 dB difference in order to function properly.
- B. InSignalLevel needs to be adjusted so that it is within the range from -20 dB to -25 dB
- C. The echo canceller is functioning properly and some echo is to be expected on every call.
- D. The actual ERL is 2dB; however, the echo canceller still does not acknowledge the input signal as echo because it is lower than the echo-cancel erl worst-case 3 command.
Correct Answer: D 🗳️
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