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最新的 CCNP 642-437 免費考試真題:

1. Which command correctly enables a trust of the existing differentiated services code point value coming into a switch?

A) switch(config-mls)#dscp trust
B) switch(config-mls)#mls qos trust dscp
C) switch(config-if)#mls qos trust dscp
D) switch(config-if)#mls dscp trust

2. In which situation would an administrator configure telephony services, but not configure any individual ephones?

A) Phones that are controlled by Cisco Unified Communications Manager Express
B) Cisco Unified Communications Manager Express with HSRP
C) Remotely located phones that are controlled by a third-party PBX
D) Cisco Unified Communications Manager SRST fallback
E) This is not a valid scenario. Ephones are always required.

3. Voice packets are arriving at a destination with a variance of between 20 and 50 milliseconds. If the jitter buffer has a capacity of 30 milliseconds, what is the impact on the audio at the receivers IP phone? Voice packets are arriving at a destination with a variance of between 20 and 50 milliseconds. If the jitter buffer has a capacity of 30 milliseconds, what is the impact on the audio at the receivers IP phone?

A) 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.
B) There will be no impact the audio stream because the audio packets are arriving in the jitter buffer window.
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.
D) The jitter buffer will replay the previous voice packets to replace those packets that exceed 30 milliseconds to avoid speech gaps.

4. What is the function of class-based marking?

A) 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.
B) Marking packets is based only on CoS value, IP precedence value or DSCP value allows Layer 3 frames to be identified and distinguished from other packets.
C) Marking frames based only on CoS value or IP precedence value allows Layer 2 frames to be identified and distinguished from other frames.
D) Marking frames or packets sets information in the Layer 2 and Layer 3 headers of a packet so that the frame or packet can be identified and distinguished from other frames or packets in the same traffic flow.
E) Marking allows network devices to classify a packet or frame, based on a specific traffic descriptor.

5. Assuming no cRTP or header compression. How many VoIP G.729 calls can be made simultaneously over a 128-kb/s Frame Relay circuit (Layer 3) if 50 percent of the circuit is dedicated to voice and 50 percent is dedicated to data?

A) 2
B) 4
C) 1
D) 3
E) 5

問題與答案：