Cisco Voice Over IP 認定 642-432 試験問題:
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) Choose another signaling protocol.
B) Hard code all IP addresses.
C) Build route tables in gateways on the segment.
D) Introduce a gatekeeper on the segment.
2. At what point does the MGCP call agent release the setup of the call path to the residential gateways?
A) after the call agent has been notified that an event occurred at the source residential gateway
B) does not release call path setup
C) after the call agent has forwarded session description protocol information to the destination from the source and has sent a modify connection to the destination and a create-connection request to the source
D) after the call agent has been notified of an event and has instructed the source residential gateway to create a connection
E) after the call agent has sent a connection request to both the source and destination and has relayed a modify-connection request to the source so that the source and destination can set up the call path
3. You have a pair of voice enabled routers capable of supporting only medium complexity codecs. You need to conserve bandwidth on WAN links without major impact to call quality. Which two codecs will satisfy these requirements? (Choose two.)
A) G.729b
B) G.729ab
C) G.729a
D) G.729
4. Refer to the exhibit. What is the minimum WAN bandwidth required to support three simultaneous VoIP calls in this network?
A) 79,200 bps
B) 19,200 bps
C) 51,600 bps
D) 247,200 bps
5. 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) Immediately moved to the front of the play-out buffer.
B) It will be dropped and treated as a lost packet.
C) It will be played out in its proper location.
D) It will be played out in the order it is received.
質問と回答：
| 質問 # 1 正解： D | 質問 # 2 正解： E | 質問 # 3 正解： B、C | 質問 # 4 正解： C | 質問 # 5 正解： B |
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