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

2. Which dial plan characteristic shows the most obvious improvement by dropping a number translation step?

A) scalability
B) hierarchical design
C) availability
D) post-dial delay

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

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

4. 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) 2
D) 3

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

Solutions: