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Cisco Voice Over IP Sample Questions:

1. You have a customer that is interested in determining the number of VoIP calls their Frame Relay WAN links can support. Each of their Frame Relay WAN links has 84 kbps of bandwidth available outside all other applications and overhead. How many G.729 calls using the 8 kbps codec and 20 byte sample size can be supported?

A) 1
B) 4
C) 3
D) 2

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

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

4. You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs use an in-band signaling type.
Which signaling type will allow you to support your customer?

A) E&M
B) CAS
C) T-CCS
D) QSIG
E) CCS
F) FXO

5. You are working with your customer in their lab to test the effect of jitter on voice quality. You have set the maximum playout delay to 40 ms on the voice enabled routers. What will be the impact on voice quality if after severe congestion the playout buffer empties and the source sends packets to the buffer faster than they are leaving?

A) There will be no noticeable drop in quality.
B) After the jitter buffer fills up, subsequent packets are discarded.
C) The jitter buffer will adapt to the faster-arriving packets by expanding the buffer size.
D) The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.

Solutions: