Pass4sure Cisco Certification

Gateway Gatekeeper Exam

Exam Number: 642-453
Associated Certifications: CCVP
Duration: 75 min. (60 questions)
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The Gateway Gatekeeper 642-453 GWGK is the exam associated with the CCVP certification. Candidates can prepare for this exam by taking the Gateway Gatekeeper (GWGK) course. This exam tests a candidate’s 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.

Exam Topics
The following information provides general guidelines for the content likely to be included on this exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect the contents of the exam and for clarity purposed the guidelines below may change at any time without notice.

Explain the function and interoperation of voice & video Gateways within an IP Communications network
Identify and describe the appropriate gateway signaling protocol to meet requirements
Identify and describe the appropriate digital line protocol to meet requirements
Identify and describe the appropriate analog line protocol to meet requirements
Describe the appropriate implementation of drop and insert multiplexing
Describe DSP functionality
Describe the different methods of provides fax and modem support

Describe the function and interoperation of Gatekeepers within an IP Communications network
Describe the function of Gatekeepers
Describe the interoperation of a Gatekeeper and a Cisco Unified CallManager
Describe the Gatekeeper Transaction Message Protocol and how it is used
Describe Dynamic Zone Prefix Registration with a Gatekeeper
Describe Gatekeeper clustering

Implement a Gatekeeper
Implement and Configure Gatekeeper to provide call admission control
Implement and Configure Gatekeeper to provide dial-plan resolution
Configure a Directory Gatekeeper to provide scalability
Implement and Configure redundancy between Gatekeeper devices
Implement and Configure Gatekeeper clustering
Configure a Gateway to register with a Gatekeeper
Configure a Cisco Unified CallManager to register with a Gatekeeper
Verify and troubleshoot Gatekeeper implementations

Implement a Gateway
Configure and verify PRI connectivity
Configure and verify BRI connectivity
Configure and verify CAS connectivity
Configure and verify Analog connectivity
Implement SRST to provide High Availability
Implement media resources on a Gateway
Implement fax and modem support on a Gateway
Configure a Gateway to provide DTMF support
Configure a Gateway to be usable by a Cisco Unified CallManager

Implement a dial-plan
Describe the components of a dial-plan
Configure digit manipulation
Implement call routing
Implement COR
Describe how the Gateway matches dial-peers
Verify and troubleshoot dial-plan implementations

Implement call applications on a Gateway
Describe how to obtain call applications
Configure call applications on a Gateway
Verify and troubleshoot call application implementations

Implement an IP-to-IP Gateway
Describe the IP-to-IP Gateway features and functionality
Configure Gatekeeper to support an IP-to-IP Gateway
Configure IP-to-IP Gateway to provide security
Configure IP-to-IP Gateway to provide protocol and media interworking
Configure IP-to-IP Gateway to provide call admission control
Verify and troubleshoot IP-to-IP Gateway implementations

QUESTION 1:

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

QUESTION 3:

Exhibit:

Please study the exhibit carefully. Certkiller .com is integrating a Cisco Unified CallManager system with the existing PBX via an E1 QSIG trunk. After the initial configuration, no calls can be placed from IP phones to PBX phones. How can this problem be resolved?

A. Add the command isdn negotiate-bchan to the serial interface.
B. Increase the ISDN T302 timer to allow more time for call setup.

TK

C. Change the channel selection order from descending to ascending.
D. Add the command isdn contiguous-bchan to the serial interface. Answer: A
QUESTION 4:

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

QUESTION 5:

Please study the exhibit carefully. Certkiller .com needs to have the receptionist at extension 5000 handle all callers who exit their auto attendant by pressing “0″. After changing the Operator parameter from 5500 to 5000, callers are still sent to extension
5500 when they press “0″ in the auto attendant. What needs to be done to correct this issue?

TK

A. The aa application needs to be reloaded in order to recognize the parameter changes.
B. The application needs to be edited to point to the correct operator.
C. Dial peer 1 needs to be restarted using the shutdown and no shutdown commands.
D. The Operator parameter should be configured under dial peer 1 using the param command.
E. The gateway needs to be reloaded for application changes to take effect. Answer: A
QUESTION 6:
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.

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Recommended Training about 642-453 exam PDF
The following courses are the recommended training for 642-453 exam PDF.
642-453 Q & A with Explanations
642-453 Audio Exam
642-453 Study Guide
642-453 Preparation Lab

Exam Number/Code: 642-453
Exam Name: Gateway Gatekeeper(GWGK)
VUE Code: 642-453
Questions Type: Single choice, Multiple choice, Simulate,
Question Numbers of Real-exam: 60 questions
Passing Scores: About 800 scores

“Gateway Gatekeeper(GWGK)”, also known as 642-453 exam, is a Cisco certification.
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Questions and Answers : 60 Q&As
Updated: April 13th , 2008
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