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Cisco Voice Over IP Sample Questions:

1. Refer to the exhibit. You have been asked to configure a dial peer on R2 that will match only the extensions of the four telephones attached. Which dial-peer statement will you use?

A) dial-peer voice 1 pots destination-pattern 555[2-5][56]
B) dial-peer voice 1 pots destination-pattern 5552.[0-5]0
C) dial-peer voice 1 pots destination pattern 5552[5-6].0
D) dial-peer voice 1 pots destination-pattern 5552[5-6][05]0

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

3. Given the SIP network shown in the diagram, identify which two actions are initiated by the UAS (user agent server)? (Choose two.)

A) originates the ACK method to indicate that it has received a response to an invitation
B) contacts the user when a SIP invitation is received
C) returns a response on behalf of the user to the invitation originator
D) originates the BYE method to initiate call termination
E) originates the INVITE method including a description of the session parameters

4. You are working with your customer in their lab to test the effect of jitter on voice quality. You have set the maximum playout delay to 40 ms on the voice enabled routers. What will be the impact on voice quality if after severe congestion the playout buffer empties and the source sends packets to the buffer faster than they are leaving?

A) After the jitter buffer fills up, subsequent packets are discarded.
B) The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.
C) There will be no noticeable drop in quality.
D) The jitter buffer will adapt to the faster-arriving packets by expanding the buffer size.

5. Refer to the exhibit. Select the recommended QoS configuration for the LAN segments of the network in the campus and branch office.

A) Configure WRR with voice as highest priority.
Use ACLs to classify voice traffic.
Isolate voice traffic in its own VLAN .
Configure access switches to trust traffic from IP phones.
B) Configure a PQ with voice control as highest priority.
Use ACLs to classify voice control traffic.
Isolate voice control traffic in its own VLAN .
Configure access switches to trust voice control traffic from IP phones.
C) Configure a PQ with WRR.
Use ACLs to classify voice traffic.
Isolate voice traffic in its own VLAN.
Configure access switches to trust traffic from IP phones.
D) Configure a PQ with WRR.
Use ACLs to classify voice control traffic.
Isolate voice traffic in its own VLAN.
Configure access switches to trust traffic from IP phones.

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