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Cisco 642-432 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Dial Plan Implementation | 20% | - Digit manipulation and translation rules - Path selection and call routing - Dial peers and call legs |
| Topic 2: Implementing VoIP Gateways | 25% | - Gateway configuration and troubleshooting - MGCP gateway operation - H.323 and SIP gateway concepts |
| Topic 3: Introduction to Voice over IP | 15% | - Voice encoding and compression (G.711, G.729, etc.) - Characteristics of VoIP networks - Voice quality and QoS fundamentals |
| Topic 4: Voice Quality and QoS | 5% | - Delay, jitter, packet loss - QoS mechanisms for VoIP |
| Topic 5: Gatekeepers and Advanced Features | 15% | - H.323 gatekeeper functions - Connecting to service providers/ITSP - Call admission control |
| Topic 6: Configuring Voice Ports | 20% | - Analog and digital voice ports - Signaling types: Loop Start, Ground Start, E&M - Voice port configuration and verification |
Cisco Voice Over IP Sample Questions:
1. Refer to the exhibit. Users are not able to complete a call from 678-555-1212 to 770-5551111. What is the correct diagnosis for the problem?
A) incorrect port statement in Router 1 pots dial peer
B) incorrect destination-pattern in Router 1
C) incorrect session-target statement in Router 2
D) incorrect dial-peer statement in Router 1
2. 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].0
B) dial-peer voice 1 pots destination-pattern 5552[5-6][05]0
C) dial-peer voice 1 pots destination-pattern 5552.[0-5]0
D) dial-peer voice 1 pots destination-pattern 555[2-5][56]
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) T-CCS
B) CCS
C) E&M
D) FXO
E) CAS
F) QSIG
4. 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) Both phones can call each other.
B) Only Phone B can call Phone A.
C) Only Phone A can call Phone B.
D) Neither phone can call the other.
5. A particular set of H.323 endpoints cannot resolve the IP address of destination endpoints.
What is the H.323 approved method to fix this problem?
A) Build route tables in gateways on the segment.
B) Hard code all IP addresses.
C) Choose another signaling protocol.
D) Introduce a gatekeeper on the segment.
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: B | Question # 3 Answer: E | Question # 4 Answer: C | Question # 5 Answer: D |
