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Cisco 642-437 Exam Syllabus Topics:

Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:

1. Which two statements describe ways that AutoQoS VoIP configuration is applied on a Cisco catalyst switch? (Choose two.)

A) The auto qos voip command is applied to each interface.
B) The auto qos voip command is applied globally in the switch.
C) The auto qos voip cisco-phone command is applied to each interface.
D) The auto qos voip trust command is applied to each interface.

2. Which Session Initiation Protocol server role is given to the component that implements a mechanism to resolve addresses?

A) Naming server
B) Location server
C) Session Initiation Protocol proxy
D) Session Initiation Protocol router

3. Voice packets are arriving at a destination with a variance of between 20 and 50 milliseconds. If the jitter buffer has a capacity of 30 milliseconds, what is the impact on the audio at the receivers IP phone? Voice packets are arriving at a destination with a variance of between 20 and 50 milliseconds. If the jitter buffer has a capacity of 30 milliseconds, what is the impact on the audio at the receivers IP phone?

A) The IP phone will negotiate in mid-call a lower bandwidth codec to reduce the delay in the arrival of voice packets to avoid voice gaps.
B) The DSP will automatically increase the jitter buffer size after sampling the range of incoming voice packets to accommodate the wider range in variation of voice packet arrival times to avoid voice gaps.
C) There will be no impact the audio stream because the audio packets are arriving in the jitter buffer window.
D) The jitter buffer will replay the previous voice packets to replace those packets that exceed 30 milliseconds to avoid speech gaps.

4. You are configuring a network to support voice to the PSTN. One important aspect to the configuration is to be able to determine the individual slot, subunit, and port number from the gateway endpoint identifier. Which signaling protocol is appropriate for this situation?

A) SIP
B) MGCP
C) H.323
D) SCCP

5. A voice gateway has the isdn switch-type command in the global configuration and on the T1 signaling channel. Which configuration takes precedence if the two configurations are different?

A) The configuration in the T1 controller portion of the Cisco IOS configuration takes precedence over the isdn switch-type command in the global configuration.
B) The voice gateway parses the configuration from top to bottom and will use the first isdn switch-type entry.
C) The configuration in the global configuration always takes precedence over the interface configuration.
D) The voice gateway will use the isdn switch-type command that matches the ISDN switch that is connected to the T1 controller.
E) The configuration under the ISDN signaling channel takes precedence over the isdn switch-type command in the global configuration.

Solutions: