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Cisco Voice Over IP Sample Questions:

1. King's Mountain Cable has a pair of voice enabled routers capable of supporting only high complexity codecs. They need to conserve bandwidth on WAN links without major impact to call quality. Which two codecs satisfy these requirements? (Choose two.)

A) G.729b
B) G.729
C) G.729a
D) G.729ab

2. What is the approximate frequency range of human speech?

A) 20 Hz to 20,000 Hz
B) 600 Hz to 5400 Hz
C) 40 Hz to 15,000 Hz
D) 200 Hz to 9000 Hz

3. The following are the original dial peer configurations for routers R1 and R2:
R1: dial-peer voice 20 voip destination-pattern 408....... session target ipv4:192.168.2.254 !
R2: dial-peer voice 21 pots destination-pattern 4085554321 port 1/0/1 !
Which phones can call to the other?

A) Both phones can call each other.
B) Only Phone A can call Phone B.
C) Only Phone B can call Phone A.
D) Neither phone can call the other.

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

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

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

Solutions: