CCNP Voice (CCVP) 642-437 CVOICE v8.0 Real Exam Questions
Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0)
The Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) 642-437 is the exam associated with the CCNP Voice certification. This exam tests a candidate’s knowledge of how to implement and operate gateways, gatekeepers, Cisco Unified Border Element, Cisco Unified Communications Manager Express and QoS in a voice network architecture. Candidates can prepare for this exam by taking the CVOICE v8.0 Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) 642-437 course.
QUESTION NO: 1
What is the function of class-based marking?
A. Marking packets based onCoS value, IP precedence value, or DSCP value allows Layer 3
frames to be identified and distinguished from other packets.
B. Marking frames based only onCoS value or IP precedence value allows Layer 2 frames to be
identified and distinguished from other frames.
C. Marking packets or frames sets information in the Layer 2 and Layer 3 headers of a packet so
that the packet or frame can be identified and distinguished from other packets or frames.
D. Marking frames only sets information in the Layer 2 headers of a frame so that the frame can
be identified and distinguished from other packets or frames.
QUESTION NO: 2
Voice packets are arriving at a destination with a variance of between 20 and 50 ms. If the jitter
buffer has a capacity of 30 ms, what is the impact on the audio at the receiving IP phone?
A. The jitter buffer will replay the previous voice packets to replace those packets that exceed
30msto avoid speech gaps.
B. The audio stream at the receiving IP phone will be delayed and garbled.
C. 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
D. 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.
QUESTION NO: 3
Your PSTN carrier sends digits to your TI PRI circuit in a digit-by-digit format. How must the T1
PRI circuit be configured to support this capability?
A. The T1 PRI controller supports either en-bloc or digit-by-digit formats natively.
B. The serial interface that is associated with the T1 controller needs to include the isdn incomingvoice
C. The T1 controller needs to include the isdn overlap-receiving command.
D. The serial interface that is associated with the T1/E1 controller needs to include the isdn
QUESTION NO: 4
You have a Cisco Unified Border Element configured to provide H.323 to SIP interworking. Which
command will verify that you have a single H.323 and a single SIP call leg when the call is placed?
A. show call active voice
B. debug voip ipipgw
C. showdialpeer voice
D. debug voice dialpeer
QUESTION NO: 5
What is the decimal equivalent of the DSCP value AF21?
QUESTION NO: 6
Which two statements are true regarding SCCP? (Choose two.)
A. SCCP requires each endpoint or gateway event to be communicated to Cisco Unified
B. Endpoints can operate autonomously if communication with Cisco Unified Communications
Manager is lost.
C. SCCP may interoperate with H.323 endpoints if it is implemented with Cisco Unified
D. Endpoints and gateways maintain the dial plan.
E. SCCP uses hex messages for communication.
QUESTION NO: 7
How many VoIP G.729 calls can be made simultaneously over a 128-kb/s Frame Relay circuit
(Layer 3) if 50 percent of the circuit is dedicated to voice and 50 percent is dedicated to data?
QUESTION NO: 8
An access layer switch is configured to extend priority to an IP phone. Cisco Discovery Protocol is
enabled on all ports. What are the three possible ways that an IP phone can be instructed to treat
the Layer 2 CoS priority value of the attached PC? (Choose three.)
A. trusted IEEE 802.1Q
B. configured DSCP level
C. configuredCoS level
E. configured IEEE 802.1Q
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