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

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

3. In a VoIP environment when speech samples are framed every 20 ms, a payload of 20 bytes is generated. Assuming a total packet length of 60 bytes, what is the length of the packet header if cRTP is deployed without redundancy checks?

A) 2 bytes
B) 3 bytes
C) 1 byte
D) 20 bytes
E) 4 bytes
F) 40 bytes

4. Refer to the exhibit. Your customer wants to converge the existing PBX network with the IP network. The three remote offices have various types of PBXs. The customer is using a combination of tie-lines and trunks to connect the PBXs today.
What kind of connection should be implemented to allow a two-way permanent connection between R1 and R4?

A) answer-mode
B) tie-line
C) trunk
D) PLAR

5. You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs use Wink-Start signaling.
Which signaling type will allow you to support the customer?

A) E&M
B) FXO
C) QSIG
D) T-CCS
E) CAS
F) CCS

Solutions: