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Cisco 642-432 Exam Syllabus Topics:

Cisco Voice Over IP Sample Questions:

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

2. One voice packet is lost between Phone A and Phone B.
What will be the result to the listener?

A) The listener will hear the audio normally. Packet loss concealment will make the loss inaudible.
B) The listener will experience a gap in the received audio stream.
C) The call is terminated.
D) The listener will hear the audio out of order when the lost packet is retransmitted.

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

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

4. You have set up a complex dial plan using translation rules. The following translation rule has been configured. What output would correspond to the test translation-rule command?
translation-rule 1 rule 0 ^0.. 215550210 rule 1 ^1.. 215550211 rule 2 ^2.. 215550212 rule 3 ^3.. 215550213 rule 4 ^4.. 215550214 rule 5 ^5.. 215550215 rule 6 ^6.. 215550216 rule 7 ^7.. 215550217 rule 8 ^8.. 215550218 rule 9 ^9.. 215550210

A) test translation-rule 1 617 The replaced number: 61721555021
B) test translation-rule 1 512 The replaced number: 21555021512
C) test translation-rule 1 555 The replaced number: 55521555021
D) test translation-rule 1 910 The replaced number: 21555021910

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) T-CCS
C) QSIG
D) CAS
E) FXO
F) CCS

Solutions: