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Cisco 642-432 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Implementing VoIP Gateways | 25% | - MGCP gateway operation - Gateway configuration and troubleshooting - H.323 and SIP gateway concepts |
| Topic 2: Configuring Voice Ports | 20% | - Voice port configuration and verification - Analog and digital voice ports - Signaling types: Loop Start, Ground Start, E&M |
| Topic 3: Voice Quality and QoS | 5% | - Delay, jitter, packet loss - QoS mechanisms for VoIP |
| Topic 4: Dial Plan Implementation | 20% | - Digit manipulation and translation rules - Dial peers and call legs - Path selection and call routing |
| Topic 5: Gatekeepers and Advanced Features | 15% | - H.323 gatekeeper functions - Call admission control - Connecting to service providers/ITSP |
| Topic 6: Introduction to Voice over IP | 15% | - Voice encoding and compression (G.711, G.729, etc.) - Characteristics of VoIP networks - Voice quality and QoS fundamentals |
Cisco Voice Over IP Sample Questions:
In the connection between a Cisco router and an E&M port on a PBX, which side is generally the Cisco side?
- A. signaling unit
- B. trunk circuit
- C. switch port
- D. loop start
Correct Answer: A 🗳️
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. 20 bytes
- C. 1 byte
- D. 40 bytes
- E. 4 bytes
- F. 3 bytes
Correct Answer: A 🗳️
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. After the jitter buffer fills up, subsequent packets are discarded.
- B. The jitter buffer will adapt to the faster-arriving packets by expanding the buffer size.
- C. There will be no noticeable drop in quality.
- D. The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.
Correct Answer: A 🗳️
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. no more than 5 calls
- B. 1 call
- C. 0 calls
- D. no more than 20 calls
- E. 2 calls
- F. no more than 10 calls
Correct Answer: B 🗳️
What is the function of a SIP registrar server?
- A. resolves active endpoint addresses
- B. acquires endpoint addresses
- C. routes service requests
- D. resolves text addresses to IP addresses
Correct Answer: B 🗳️
