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Cisco Voice Over IP Sample Questions:

1. 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

2. How do a-law and mu-law handle issues with signal-to-noise ratios related to the measure of amplitude?

A) Increase code points at lower amplitudes.
B) Use smaller step functions at higher frequencies.
C) Increase code points at higher frequencies.
D) Use smaller step functions at lower amplitudes.

3. What is the E.164 numbering plan?

A) the European PBX standard telephony number plan
B) the ITU worldwide number plan
C) the IETF North American number plan
D) a proprietary PBX number plan

4. Which statement is true about VoIP packet loss?

A) Even minimal packet loss causes echo.
B) Codec algorithms can overcome minimal packet loss.
C) IP phones can reconstruct up to three consecutive lost packets.
D) Lost packets are simply retransmitted.

5. 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.729ab
B) G.729
C) G.729b
D) G.729a

Solutions: