Exam 642-453: Gateway Gatekeeper Exam (GWGK)
Related Certifications: CCVP
Number of Questions: 60
Duration: 75 minutes

Exam Topics Include:
• Explain the function and interoperation of voice & video Gateways within an IP Communications network
• Describe the function and interoperation of Gatekeepers within an IP Communications network
• Implement a Gateway
• Implement a Gatekeeper
• Implement a dial-plan
• Implement call applications on a Gateway
• Implement an IP-to-IP Gateway

The Gateway Gatekeeper 642-453 GWGK is the exam associated with the CCVP certification. This exam will test your knowledge of the implementation of Cisco gateways and gatekeepers, including integration of a VoIP network to both PSTN and TDM equipment. Topics covered include implementing dial plans and advanced gateway features such as SRST and DSP resources, implementing gatekeepers and directory gatekeepers to provide hierarchical dial plan resolution, and call admission control.
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When configuring a gatekeeper-controlled H.255 trunk, what is the maximum number of
Cisco Unified CallManager systems that can be assigned to the trunk?
A. 4
B. 1
C. 3
D. 6
E. 2
F. 8
Answer: C
QUESTION 2:
Which codec complexity should be configured to maximize the number of simultaneous
voice calls that can be supported by a PVDM2-16?
A. Flex
B. High
C. Medium
D. Low
Answer: A
Which two statements are correct descriptions of bandwidth management and bandwidth
control? (Choose two.)
A. Both bandwidth management and bandwidth control are H.323 mandatory functions. B.
Bandwidth management is an H.323 optional function and bandwidth control is a
mandatory function.
C. Bandwidth management manages endpoint bandwidth and provides intrazone call
admission control, while bandwidth control provides interzone call admission control. D.
Bandwidth management manages endpoint bandwidth requirements and bandwidth
control provides call admission control.
E. Bandwidth management provides call admission control and bandwidth control
manages endpoint bandwidth requirements.
F. Bandwidth management is an H.323 mandatory function and bandwidth control is an
optional function.
Answer: B,E
Which issue found in CAS T1s can be eliminated by converting to PRI?
A. the inability to send and receive ANI on all DS0s B
long call setup due to few signaling bits per frame
C. voice quality issues involving robbed bits
D. PSTN switch type mismatches
E. outgoing call channel order mismatch (descending vs. ascending)
Answer: A
QUESTION 7:
You are working with a client who is interested in deploying a distributed IP telephony
call-processing solution among the three corporate campuses. Each campus will have a
Cisco Unified CallManager cluster and a gateway to the PSTN. Which three steps are
required for a successful gatekeeper deployment? (Choose three.)
A. determining if each zone will be supported by more than one gatekeeper B.
ensuring the correct location of voice gateways in the network
C. implementing the correct WAN topology
D. determining the intrasite modem and fax traffic patterns E.
provisioning a common codec for all WAN connections
F. determining if gatekeeper redundancy or high availability is required
Answer: C,E,F
QUESTION 8:
How can you configure an MGCP gateway so that it is controlled by the Cisco Unified
CallManager?
A. The Cisco Unified CallManager and the MGCP gateway are peers; the Cisco Unified
CallManager does not control MGCP gateways.
B. Use the telephony-service ccm-compatible gateway command to enable the Cisco
Unified CallManager to control the gateway.
C. Configure the MGCP gateway in the Cisco Unified CallManager; the gateway will
automatically be sent a configuration.
D. Configure the gateway on the Cisco Unified CallManager, configure the gateway for
MGCP, and define the Cisco Unified CallManager as the call agent on the gateway.
E. Use the mgcp-gateway voip srcadd gateway command to bind the gateway to the Cisco
Unified CallManager.
Answer: D
QUESTION 9:
When an IP-to-IP gateway registers with a gatekeeper, what type of endpoint is the
gateway listed as?
A. VOIP
B. H323-GW
C. gateway
D. IP-IP
Answer: B
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