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Cisco Voice Over IP Sample Questions:

1. Which statement is true about VoIP packet loss?

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

2. A 9 digit number must be dialed to reach numbers on the PSTN. What process makes sure that the first digit 9 is not transmitted as part of the called number?

A) digit seizing
B) digit masking
C) digit alternating
D) digit manipulation

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

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

4. In an effort to consume less bandwidth across the WAN, the decision was made at Acme Chemical Company to change the voice packet size. They changed from two voice frames per packet to one voice frame per packet. What effect did this have on Acme's voice traffic?

A) Per call bandwidth consumption decreased and end-to-end delay decreased.
B) Per call bandwidth consumption increased and end-to-end delay decreased.
C) Per call bandwidth consumption increased and end-to-end delay also increased.
D) There was no effect on voice traffic.
E) Per call bandwidth consumption decreased and end-to-end delay increased.

5. Which device is used to allow an H.323 stream to transit a firewall?

A) gateway
B) MCU
C) gatekeeper
D) proxy

Solutions: