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Cisco 642-432 Exam Syllabus Topics:

Cisco Voice Over IP Sample Questions:

Question 1

What is the best description of an MGCP endpoint?

A. any analog telephony device (PBX, switch, etc.)
B. the gatekeepers in a VoIP network
C. IP phones
D. the interconnection between packet and traditional telephone networks

Question 2

In an effort to consume less bandwidth across the WAN, the decision was made at Acme Chemical Company to change the voice packet size. They changed from two voice frames per packet to one voice frame per packet. What effect did this have on Acme's voice traffic?

A. Per call bandwidth consumption increased and end-to-end delay also increased.
B. Per call bandwidth consumption decreased and end-to-end delay increased.
C. There was no effect on voice traffic.
D. Per call bandwidth consumption increased and end-to-end delay decreased.
E. Per call bandwidth consumption decreased and end-to-end delay decreased.

Question 3

Which statement is true about VoIP packet loss?

A. IP phones can reconstruct up to three consecutive lost packets.
B. Even minimal packet loss causes echo.
C. Codec algorithms can overcome minimal packet loss.
D. Lost packets are simply retransmitted.

Question 4

Refer to the exhibit. Your customer wants to converge voice and data on the existing T1 Frame Relay WAN link between New York and Atlanta. The customer has allocated 25 percent of the WAN link for routing updates and other overhead. You are using 6 bytes of overhead for Frame Relay, no cRTP, and the G.729 codec.
How many calls could be placed on this link?

A. four
B. three
C. seven
D. five
E. two
F. six

Question 5

Which type of delay is caused when large data packets block voice packets from the outbound interface?

A. serialization delay
B. queuing delay
C. packetization delay
D. propagation delay

Solutions: