642-432 Q&A - in .pdf
642-432 Value Pack
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- Exam Code: 642-432
- Exam Name: Cisco Voice Over IP
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- Updated: Sep 13, 2026
- Q & A: 72 Questions and Answers
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642-432 Q&A - Testing Engine
- Exam Code: 642-432
- Exam Name: Cisco Voice Over IP
- Updated: Sep 13, 2026
- Q & A: 72 Questions and Answers
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Cisco 642-432 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Cisco Unified Communications Architecture | - Call processing design
|
| Topic 2: IP Phone Deployment and Features | - Endpoint registration and configuration
|
| Topic 3: Quality of Service (QoS) for Voice | - Voice traffic prioritization
|
| Topic 4: Call Control and Survivability | - Redundancy and high availability
|
| Topic 5: Voice Gateway and Protocol Integration | - PSTN integration
|
Cisco Voice Over IP Sample Questions:
A particular set of H.323 endpoints cannot resolve the IP address of destination endpoints. What is the H.323 approved method to fix this problem?
- A. Introduce a gatekeeper on the segment.
- B. Choose another signaling protocol.
- C. Build route tables in gateways on the segment.
- D. Hard code all IP addresses.
Correct Answer: A 🗳️
You have a pair of voice enabled routers capable of supporting only medium complexity codecs. You need to conserve bandwidth on WAN links without major impact to call quality. Which two codecs will satisfy these requirements? (Choose two.)
- A. G.729b
- B. G.729ab
- C. G.729a
- D. G.729
Correct Answer: B,C 🗳️
One voice packet is lost between Phone A and Phone B.
What will be the result to the listener?
- A. The listener will hear the audio out of order when the lost packet is retransmitted.
- B. The listener will experience a gap in the received audio stream.
- C. The listener will hear the audio normally. Packet loss concealment will make the loss inaudible.
- D. The call is terminated.
Correct Answer: C 🗳️
Site A uses three-digit internal numbers and Site B uses four-digit internal numbers.
All calls to the PSTN are routed through Site B.
What dial plan below best represents provision simplicity?
- A. Translate all called numbers leaving Site A to ten digits.
- B. Translate all called numbers within Site A to four digits.
- C. Translate all called numbers within Site B to three digits.
- D. Translate all called numbers at either site to ten digits.
Correct Answer: A 🗳️
In the VoIP network above, which protocol provides the necessary sequence numbers so voice packets originating at R1 are played in the correct order at R5?
- A. TCP
- B. RTP
- C. CRTP
- D. UDP
- E. RTCP
Correct Answer: B 🗳️
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