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Cisco 642-432 Exam Syllabus Topics:

Cisco Voice Over IP Sample Questions:

1. Which process changes an internal extension into a fully qualified external PSTN number before matching to a dial peer?

A) forward digits
B) number expansion
C) prefix extension
D) digit masking

2. 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 a proprietary signaling type.
Which signaling type will allow you to support your customer?

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

3. Refer to the exhibit. Will these delays meet the G.114 recommendation for one-way delay?

A) No, they will not meet the recommendation for general network purposes.
B) No, but they will be acceptable for time-sensitive transaction processing.
C) Yes, they will meet the recommendation, provided the administrators understand the implications.
D) Yes, they will meet the recommendation for most user applications.

4. Which problem does a-law and mu-law address?

A) encoding loses signal integrity at lower frequencies
B) quantization produces distortion at higher frequencies
C) quantization produces higher signal-to-noise ratios at smaller amplitudes
D) encoding produces greater signal loss at higher amplitude

5. To hide its identity when initiating calls, Phone B requests that Server B place its calls for it. What kind of device is Server B?

A) user agent server
B) redirect
C) registrar
D) user agent client
E) proxy

Solutions: