Cisco 642-432 exam : Cisco Voice Over IP

642-432 Exam Simulator
  • Exam Code: 642-432
  • Exam Name: Cisco Voice Over IP
  • Updated: Sep 09, 2026
  • Q & A: 72 Questions and Answers

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Cisco 642-432 Exam Syllabus Topics:

SectionObjectives
Voice over IP Configuration- Voice over IP Configuration
  • 1. Configure FXS and FXO ports
  • 2. Configure VoIP and POTS dial peers
  • 3. Configure gateways and gatekeepers
  • 4. Configure hunt groups
  • 5. Explain inbound and outbound dial peer matching
  • 6. Explain default dial peers
  • 7. Configure a router for a basic IP telephony call
  • 8. Explain digit collection, consumption, and manipulation
  • 9. Configure E&M interfaces
  • 10. Configure call signaling
Integrating Voice over IP into the PSTN- PSTN Integration
  • 1. Explain E.164 addressing
  • 2. Connect a basic VoIP network to the PSTN
  • 3. Describe digit manipulation
Integrating Voice over IP into Existing PBX Networks- PBX Integration
  • 1. Integrate a basic IP telephony network with an existing PBX
  • 2. Explain signaling requirements for PBX connectivity
  • 3. Select appropriate connection types between PBX and VoIP networks
  • 4. Explain port requirements for PBX connectivity
Voice over IP Technologies- Voice over IP Technologies
  • 1. Explain TDM and statistical multiplexing in telephony
  • 2. Compare PSTN call signaling with VoIP call signaling
  • 3. Identify PSTN characteristics and transport mechanisms
  • 4. Compare PSTN and VoIP including call transport, signaling, and bandwidth requirements
  • 5. Identify VoIP characteristics and transport mechanisms
  • 6. Differentiate VoIP technologies from PSTN technologies
Call Operation and Components in Voice over IP- Call Operation and Components
  • 1. Describe analog-to-digital conversion
  • 2. Explain H.323
  • 3. Explain RTP, RTCP, and CRTP
  • 4. Explain MGCP
  • 5. Describe companding and compression processes
  • 6. Explain packetization and codec types
  • 7. Describe the basic operation and components of an IP telephony call
  • 8. Explain SIP
  • 9. Explain voice quality considerations
  • 10. Choose appropriate codecs for different scenarios
  • 11. Explain the function and operation of call legs
  • 12. Explain E&M signaling
  • 13. Explain Quality of Service (QoS)

Cisco Voice Over IP Sample Questions:

Question 1

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. RTCP
B. TCP
C. UDP
D. RTP
E. CRTP


Question 2

The illustration above shows the timing and order of arrival of voice packets at the end device. Each voice packet contains 20 ms of voice data. Assuming a play-out buffer of 20 ms, what will happen to voice packet number 3?

A. It will be played out in its proper location.
B. It will be dropped and treated as a lost packet.
C. Immediately moved to the front of the play-out buffer.
D. It will be played out in the order it is received.


Question 3

Which dial plan characteristic shows the most obvious improvement by dropping a number translation step?

A. hierarchical design
B. scalability
C. availability
D. post-dial delay


Question 4

Examine the output.
ccm-manager mgcp ! mgcp 5036 ! voice-port 1/0/0 ! voice-port 1/0/1 ! dial-peer voice 1 pots application MGCPAPP port 1/0/0 !
dial-peer voice 2 pots application MGCPAPP port 1/0/1 !
Your customer has sent you their MGCP gateway configuration. They are unable to get the gateway to communicate with the call agent. What command needs to be inserted to resolve the problem?

A. application MGCPAPP 172.16.1.1
B. mgcp call-agent 172.16.1.1
C. mgcp 5036 172.16.1.1
D. ccm-manager mgcp 172.16.1.1


Question 5

Refer to the exhibit. Users are not able to complete a call from 678-555-1212 to 770-5551111. What is the correct diagnosis for the problem?

A. incorrect dial-peer statement in Router 1
B. incorrect port statement in Router 1 pots dial peer
C. incorrect session-target statement in Router 2
D. incorrect destination-pattern in Router 1


Solutions:

Question 1
Answer: D
Question 2
Answer: B
Question 3
Answer: D
Question 4
Answer: B
Question 5
Answer: D

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