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CCVP Gateway Gatekeeper Exam (GWGK) : 642-452 Exam

Exam Number/Code: 642-452
Exam Name: CCVP Gateway Gatekeeper Exam (GWGK)
VUE Code: 642-452
Questions Type: Single choice, Multiple choice, Simulate,
Question Numbers of Real-exam: 55-65 questions
Exam Language(s): English
Exam Description Introduction
The Gateway Gatekeeper exam assesses the knowledge of the Systems Engineer on the implementation of Cisco gateways and gatekeepers to integrate a VoIP network to both PSTN and TDM equipment. This includes implementing dial plans and advanced gateway features such as SRST and DSP resources. The exam also covers implementing gatekeepers and directory gatekeepers to provide hierarchical dial plan resolution and call admission control.

Exam Topics
Explain the function and interoperation of Gateways within a converged network
Compare and contrast the different protocols used on the Gateways, and the appropriate application of each protocol
Explain the differences between the various Digital and Analog line protocols
Describe and explain QSIG and its implementation
Describe and explain drop and insert multiplexing features

Configure and implement DSP resources to support specified requirements
Explain the capabilities and functions of a DSP resources
Configure a DSP resources to support transcoding
Configure a DSP resources to support conferencing

Explain the function and interoperation of Gatekeepers within a converged network
Explain the function of Gatekeepers
Explain the interoperation of a Gatekeeper and the call agent
Describe and explain the Gatekeeper transaction message protocol and it’s usages

Determine the relevant technical and business needs that effect the choice of Gateway features, protocols and placement
Select the correct placement of the Gateway within a given network topology to meet stated requirements
Given different Telco and PBX system offerings, determine which Gateway services can be supported
Select the correct protocol to support the required features (Fax relay, modem relay, pass-though, survivability, caller-ID, caller name display)

Determine the relevant technical and business needs that effect the choice of Gatekeeper features and placement
Select the correct placement of the Gatekeeper within a given network topology to meet stated requirements
Select the appropriate Gatekeeper functionality given stated business and technical requirements. (call admission control, dial-plan resolution)

Configure and implement a Gateway to interface with the PSTN
Configure PRI connectivity (switch type, signaling)
Configure BRI connectivity (switch type, signaling)
Configure CAS connectivity ( feature group B and D, E1 R2)
Configure Analog connectivity (loop and ground start, FXO, DID, FXS)
Configure drop-and-insert feature
Verify and troubleshoot configurations

Configure and implement a Gateway to interface with a PBX and voice mail system
Configure analog connectivity (FXO, FXS, E&M types 1-4)
Configure PRI connectivity (switch type, Qsig, signaling)
Configure BRI connectivity (switch type, signaling)
Configure CAS connectivity ( feature group B and D, E1 R2)
Configure additional voicemail connectivity features (DTMF 4th column, etc)
Configure IP circuit emulation feature
Verify and troubleshoot configurations

Design and deploy a dial-plan to meet specific requirements
Configure digit manipulation. (translation rules, number expansion)
Design call routing scheme to meet technical and business requirements
Configure alternate call routing. Based on resource availability or cost
Implement and configure COR to meet business requirements
Configure Gateway to use Gatekeeper for call resolution
Configure call agent to use Gatekeeper for call resolution
Verify and troubleshoot configurations

Implement extended services on the Gateway including Auto Attendant and Accounting/Billing
Download TCL scripts
Configure Auto Attendant using TCL scripts
Describe TCL usages (Billing, Radius, AAA)

Design and deploy redundant Gateway configurations to provide high availability
Implement SRST on the Gateway
Describe necessary physical connectivity requirements to support redundant gateways

Design and deploy redundant Gatekeeper configurations to provide high availability
Configure HSRP between Gatekeeper devices
Configure Gatekeeper clustering

Configure and implement Gateways and Gatekeepers within a managed services or service provider environment
Determine when an IP-IP Gateway is necessary to meet technical and business requirements
Configure IP-IP Gateways
Describe and explain when the OSP protocol is necessary to meet technical requirements
Contrast the Enterprise and Service Provider environments

“CCVP Gateway Gatekeeper Exam (GWGK)”, also known as 642-452 exam, is a Cisco certification.
Preparing for the 642-452 exam Searching 642-452 Test Questions, 642-452 Exam, 642-452 Dumps

With the complete collection of questions and answers Q&as with Expert Explanations, Pass4sure has assembled to take you through 156 questions to your 642-452 Exam preparation. In the 642-452 exam resources, you will cover every field and category in CCVP helping to ready you for your successful Cisco Certification.

QUESTION 16:
Exhibit, Network Topology
Exhibit #2
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PassGuide .com has assigned extensions based on the dialing restrictions. All users in the range of 1000 to
1999 are to be set up so that they can dial only emergency and local calls via the PSTN. Given the
configuration of PassGuide 1, which types of calls can Phone-A actually make via the PSTN?
A. None
B. emergency calls only
C. emergency calls and local calls only
D. emergency calls, local calls, and long-distance calls only
E. any calls
Answer: C
Explanation:
The Class of Restrictions (COR) feature provides the ability to deny
certain call attempts
based on the incoming and outgoing CORs provisioned on the dial-peers.
COR is used to specify which incoming dial-peer can use which outgoing
dial-peer to
make a call. Each dial-peer can be provisioned with an incoming and an
outgoing COR list.
In the question, the corlist command sets the dial-peer COR parameter for
dial-peers(VoIP)
and the directory number (1374) that is created for analog phone connected
to Cisco VoIP gateway.
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COR functionality provides the ability to deny certain call attempts on the
basis of the incoming and
outgoing class of restrictions that are provisioned on the dial-peers.
If the COR applied on an incoming dial-peer (for incoming calls) is a super
set or equal to the
COR applied to the outgoing dial-peer (for outgoing calls), the call goes
through.
Based on the above rule , Phone A only can make emergency calls and local
calls
successfully..
QUESTION 17:
Which configuration will provision an E1 for ITU Q421 digital line signaling and compelled register
signaling?
A. controller e1 1/0
cas-group 1 timeslots 1-31 type r2-digitial r2-compelled ani
B. controller e1 1/0
cas-group 1 timeslots 1-31 r2-compelled ani
C. controller e1 1/0
cas-group 1 timeslots 1-31 r2-digital ani
cas-custom 1
signaling r2-compelled
D. controller e1 1/0
cas-group 1 timeslots 1-31 type r2-compelled
cas-custom 1
signaling r2-digital
Answer: A
Explanation:
R2 inter-register signaling: These signaling types are configured using
the cas-group (controller e1) command.
The three signaling types are described as follows:
Line signaling includes the following types:
- R2 digital:R2 line-signaling type ITU-U Q.421 is typically used for PCM systems
(where A- and B-bits are used).
- R2 analog:R2 line-signaling type ITU-U Q.421 is typically used for carrier systems
(where a tone A-bit is used).
- R2 pulse:R2 line-signaling type ITU-U Supplement 7 is typically used for systems that
employ satellite links (where a tone A-bit is pulsed).
R2 compelled: When a tone pair is sent from the switch (forward signal), the tones stay
on until the remote end responds (by sending an acknowledgment [ACK]). The remote
responds with a pair of tones that signals the switch to turn off the tones. The tones are
compelled to stay on until they are turned off.. Additional information on E1R2 can be
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found in E1 R2 Signaling Theory at
http://www.cisco.com/en/US/tech/ CK6 52/ CK6 53/technologies_tech_note09186a00800943c2.shtml
Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v1.0
pg 2-80 to 90 Integrating a VoIP Network to the PSTN and PBXs
QUESTION 18:
What is a benefit of implementing an IP-to-IP gateway?
A. provides IP network privacy and trust boundary for security
B. offers equivalent quality and cost savings when compared to back.-to-back gateways
C. works in conjunctions with gateway proxies to provide scalable video solutions
D. enhances policy-routing capability by assigning carrier IDs to partner gateways
Answer: A
QUESTION 19:
A gateway is connected to the PSTN via eight analog circuits. Which two methods can be used to route
calls across all eight circuits? Select two.
A. For each destination pattern, configure eight dial peers pointing to each port and use the preference
command to select which port is used.
B. Assign each port to a trunk group. For each destination pattern, configure a single dial peer pointing to the
trunk group.
C. Assign each port to a hunt list. For each destination pattern, configure a single dial peer pointing to the hunt
list.
D. For each destination pattern, configure a single dial peer. Use the port range command to select which port is
used.
E. For each destination pattern, configure eight dial peers pointing
Answer: A, B
QUESTION 20:
A service provider wants to add SIP devices to the existing H.323 voice network. Which Cisco device will
allow the SIP devices to use the existing routing structure on the H.323 gatekeeper?
A. SIP voice gateway
B. Cisco SIP Proxy Server
C. Cisco SIP Redirect Server
D. Cisco SIP Registrar Server
Answer: B