CVOICE v8.0 642-437 test answers, Voice over IP and QoS v8.0
01.07.2011 by admin - Comments OffPosted in CCNP
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1.What is the function of class-based marking?
A. Marking packets based onCoS value, IP precedence value, or DSCP value allows Layer 3 frames to be identified and distinguished from other packets.Â
B. Marking frames based only onCoS value or IP precedence value allows Layer 2 frames to be identified and distinguished from other frames.Â
C. Marking packets or frames sets information in the Layer 2 and Layer 3 headers of a packet so that the packet or frame can be identified and distinguished from other packets or frames.Â
D. Marking frames only sets information in the Layer 2 headers of a frame so that the frame can be identified and distinguished from other packets or frames.Â
Answer: AÂ Â
2.Voice packets are arriving at a destination with a variance of between 20 and 50 ms. If the jitter buffer has a capacity of 30 ms, what is the impact on the audio at the receiving IP phone?Â
A. The jitter buffer will replay the previous voice packets to replace those packets that exceed 30msto avoid speech gaps.Â
B. The audio stream at the receiving IP phone will be delayed and garbled.Â
C. The DSP will automatically increase the jitter buffer size after sampling the range of incoming voice packets to accommodate the wider range in variation of voice packet arrival times to avoid voice gaps.Â
D. The IP phone will negotiate, in mid-call, a lower bandwidth codec to reduce the delay in the arrival of voice packets to avoid voice gaps.Â
Answer: B
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