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Cisco Voice Over IP Sample Questions:

1. 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) Build route tables in gateways on the segment.
B) Hard code all IP addresses.
C) Choose another signaling protocol.
D) Introduce a gatekeeper on the segment.

2. What does a gateway router match to a dialed number when setting up a VoIP call?

A) session target
B) call leg
C) destination pattern
D) IP route

3. 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) The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.
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) There will be no noticeable drop in quality.

4. Which problem does a-law and mu-law address?

A) encoding loses signal integrity at lower frequencies
B) quantization produces distortion at higher frequencies
C) encoding produces greater signal loss at higher amplitude
D) quantization produces higher signal-to-noise ratios at smaller amplitudes

5. How do a-law and mu-law handle issues with signal-to-noise ratios related to the measure of amplitude?

A) Increase code points at higher frequencies.
B) Increase code points at lower amplitudes.
C) Use smaller step functions at lower amplitudes.
D) Use smaller step functions at higher frequencies.

Solutions: