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Cisco Voice Over IP Sample Questions:

1. The following are the original dial peer configurations for routers R1 and R2:
R1: dial-peer voice 20 voip destination-pattern 408....... session target ipv4:192.168.2.254 !
R2: dial-peer voice 21 pots destination-pattern 4085554321 port 1/0/1 !
Which phones can call to the other?

A) Only Phone B can call Phone A.
B) Neither phone can call the other.
C) Both phones can call each other.
D) Only Phone A can call Phone B.

2. You are meeting with a customer that has deployed IP telephony at their headquarters
location. They would like to roll out IP telephony to their regional office as well. They are now using the G.711 codec at headquarters. They want to be able to maximize the number of calls carried without impacting voice quality or forcing a WAN upgrade. Which codec would be appropriate for their WAN?

A) G.729B
B) G.711
C) G.723.1
D) G.726

3. 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 an in-band signaling type.
Which signaling type will allow you to support your customer?

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

4. You have been forwarded some questions by a prospective VoIP customer who would like to know the Cisco default sample size for the G.729 codec. What is it?

A) 20 ms
B) 30 ms
C) 40 ms
D) 10 ms

5. Refer to the exhibit.
Lighthorse Equine Management would like to investigate converging voice and data on their existing T1 Frame Relay WAN link between New York and Atlanta. Currently the following list of applications are consuming no more bandwidth than what is listed on this segment of the network.
T1 link 1536 kbps
e-mail 75 kbps
internet 200 kbps
Oracle 500 kbps
FTP 250 kbps
Total 1025 kbps
The customer has allocated 25% of the WAN link for routing updates and other overhead. They would like to increase the number of samples encapsulated in each PDU to 40 ms. You have calculated 6 bytes of overhead for Frame Relay, no cRTP, and the use of the
G.711 codec.
How many simultaneous calls could be placed on this link?

A) 1 call
B) 0 calls
C) no more than 5 calls
D) no more than 20 calls
E) 2 calls
F) no more than 10 calls

Solutions: