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Exam A
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
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
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
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
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.
C. Change the channel selection order from descending to ascending.
D. Add the command isdn contiguous-bchan to the serial interface.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
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.
Correct Answer: BE Section: (none) Explanation
Explanation/Reference:
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?
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.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
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)
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
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
Correct Answer: CEF Section: (none) Explanation
Explanation/Reference:
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.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
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
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 10
DRAG DROP Network topology exhibit
You work as a network technician at Certkiller .com. You study the network topology exhibit carefully. You are required to configure the Certkiller 1 Gatekeeper, Your boss, Miss Certkiller, has already entered the IP address command. A command can be entered both as a interface command and as a gatekeeper command. You are not required to use all options.
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference: QUESTION 11
If an endpoint sends the digit string “2125551212” to a gatekeeper that contains the following configuration, what will happen next? gatekeeper zone local SJ acme.com 192.168.1.1 zone remote NY acme.com 172.16.1.100 zone prefix SJ 408* zone prefix NY 212……. no shut
A. An ARJ will be returned to the endpoint because the gatekeeper is unable to match all the digits.
B. The call will be routed to the gateway registered with the gatekeeper that controls the NY zone.
C. The call will be routed to the PSTN.
D. An ACF will be returned to the endpoint instructing it to set up a call with the endpoint that uses the IP address contained in the ACF.
E. The gatekeeper will send an LRQ to the gatekeeper that controls the NY zone and return a RIP RAS message to the endpoint.
F. The call will be routed to the gateway registered with the gatekeeper for the SJ zone.
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 12
Certkiller .com field offices route calls to headquarters through gateways to the PSTN. The headquarters numbers are all in the form 1-202-454-5XXX. At present, calls to headquarters require 12 dialed digits: the access code “9” followed by the 11-digit number. Employees in the field offices would like to call people at headquarters by dialing only their four-digit extensions. Which Cisco IOS command will allow them to do this? (Assume that any associated commands needed in order to apply the one chosen will also be added)
A. Certkiller 3(config-dial-peer)#forward-digits 11
B. Certkiller 3 (cfg-translation-rule)#rule 1 /912024545/ /^5/
C. Certkiller 3 (config-dial-peer)#prefix 912024545
D. Certkiller 3 (config)#num-exp 5… 912024545…
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 13
In which three situations would an IP-to-IP gateway be useful? (Choose three.)
A. an organization has deployed a SIP IP telephony solution and needs to connect to a SIP service provider
B. an organization needs to integrate larger PSTN gateways into their SIP network
C. two organizations have merged and both use SCCP signaling
D. an organization would like to migrate from H.323 to SIP
E. an organization needs to migrate from a Cisco Unified CallManager IP telephony solution based on SCCP to an H.323 solution.
F. an organization using H.323 needs to integrate an acquisition that also uses H.323
Correct Answer: ADF Section: (none) Explanation
Explanation/Reference:
QUESTION 14
Please study the exhibit carefully. Why is the gatekeeper sending a RIP RAS message to the endpoint?
A. because it has exceeded the timeout and needs to restart the call
B. because it cannot respond to a request within the specified timeout
C. because the current call needs to be restarted due to an RRJ
D. because it has to initiate a restart to avoid timing out
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 15
When a gatekeeper cluster is deployed, how does a gatekeeper in the cluster indicate to a gateway that it should register with an alternate gatekeeper?
A. It sends an ARJ or RRJ message containing the IP address of the alternate gatekeeper that the gateway should attempt to register with to complete the call.
B. It sends an ARJ or RRJ message accompanied by an ordered list of alternate gatekeepers the gateway should attempt to register with.
C. It sends an ARJ or RRJ, which triggers the automatic re-registration of the gateway with the first gatekeeper in the alternate gatekeeper list.
D. It sends an ARJ or RRJ message containing instructions to use the first member of the alternate gatekeeper list provided by the gatekeeper.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 16
The following Cisco IOS voice translation rule is entered:
voice translation-rule 1
rule 1 /^91\(360\)\(.+\)/ /9\2/
What will be the result if the rule is tested with the number 9-1-360-269-1212 (without the hyphens)?
A. 991
B. The number will not match the rule
C. 91360
D. 9360
E. 92691212
F. 913601212
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 17
A customer has two Cisco Unified CallManager clusters, each with an IP-to-IP gateway. When deploying RSVP Call Admission Control between the Cisco Unified CallManager clusters using the IP-to-IP gateways, which two are required? (Choose two.)
A. that the IP-to-IP gateways be configured as RSVP peers
B. media flow-through
C. that an IP-to-IP gateway and a gateway or gatekeeper be configured as RSVP peers
D. media flow-around
E. that the IP-to-IP gateways and the Cisco Unified CallManager clusters be configured with an RSVP agent
Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
QUESTION 18
When a C5510 DSP is configured for conferencing, what other services can it be configured to support?
A. transcoding
B. no other services
C. voice port termination
D. supplementary services
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 19
Users are complaining that they are not seeing caller names on calls received from the PSTN. Which debug command can be used to troubleshoot this problem?
A. debug vpm signal
B. debug ccs signal
C. debug isdn q921
D. debug isdn setup
E. debug isdn q931
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 20
The Acme Corporation network contains gateways, gatekeepers, and a directory gatekeeper. If a gatekeeper containing the following configuration receives the digit string “2125551212” from an endpoint, what will the gatekeeper do next? gatekeeper zone local SJ acme.com 192.168.1.1 zone remote DGK acme.com 172.16.1.100 zone prefix SJ 408* zone prefix DGK * no shut
A. send a call setup message to the gateway registered with the gatekeeper that controls the NY zone
B. send a call setup message to the gateway registered with DGK
C. send an LRQ message to DGK to resolve the call routing
D. send an ACF back to the endpoint instructing it to set up a call with the gateway registered with the SJ gatekeeper
E. send an ARJ message to the endpoint because the gatekeeper is unable to match all the digits
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 21
Certkiller .com wants to route inbound faxes directly to the recipient’s e-mail. Which gateway fax protocol will support this?
A. T.37
B. Fax Pass-Through
C. T.38
D. Fax Relay
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 22
Please study the exhibit carefully. Which dial peer will send calls to the PSTN via the T1 configured as shown?
A. dial-peer voice 1 pots destination-pattern 9T port 3/0:0
B. dial-peer voice 1 pots destination-pattern 9T session target 3/0:1
C. dial-peer voice 1 pots destination-pattern 9T session target 3/0:0
D. dial-peer voice 1 pots destination-pattern 9T port 3/0:1
E. dial-peer voice 1 pots destination-pattern 9T port 3/0:24
F. dial-peer voice 1 pots destination-pattern 9T session target 3/0:24
Correct Answer: A Section: (none) Explanation
Explanation/Reference: QUESTION 23
DRAG DROP You work as a network administrator at Certkiller .com. Your Certkiller trainee Certkiller is curious about gateway signaling protocols and PSTN trunk types. Assuming all gateways are SRST gateways what will happen to active calls to or from the PSTN when the gateway fails over the SRST mode (either preserved or dropped)?
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
QUESTION 24
A single call is active through an IP-to-IP gateway. If you use the show gatekeeper calls command, how many active call legs will be indicated?
B. 3
C. 2
D. 1
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 25
Which statement accurately describes the amount of bandwidth required for a fax call using fax pass-through when packet redundancy is not enabled?
A. The fax call uses the same amount of bandwidth as a G.711 voice call.
B. The fax call uses the same amount of bandwidth as a G.729 voice call.
C. The fax call uses 20% more bandwidth than a G.711 voice call because the fax sample size is smaller.
D. The fax call uses 20% more bandwidth than a G.729 voice call because the fax sample size is smaller.
E. The fax call uses 20% more bandwidth than a G.729 voice call because the fax sample size is larger.
F. The fax call uses 20% more bandwidth than a G.711 voice call because the fax sample size is larger.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 26
You need to configure a gatekeeper to limit the number of voice calls between any local zone and any other zone to five simultaneous G.729 calls. Which bandwidth command would you enter into the gatekeeper configuration?
A. bandwidth total interzone default 80
B. bandwidth total default 80
C. bandwidth interzone zone SJ 80
D. bandwidth interzone default 80
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 27
A dial peer is configured with an outgoing COR list. Which two conditions must be met for calls matching this outbound dial peer to be blocked? (Choose two.)
A. The outgoing COR list must be a superset of the incoming COR list.
B. The incoming COR list and the outgoing COR list must contain the same members.
C. The outgoing COR list must be a subset of the incoming COR list.
D. An incoming COR list must be configured on the matched outbound dial peer.
E. An incoming COR list must be configured on the matched inbound dial peer.
Correct Answer: AE Section: (none) Explanation
Explanation/Reference:
QUESTION 28
Which gatekeeper configuration will send all calls between zone hardware and zone appliances through the IP-to-IP gateway in the VIA zone?
A. gatekeeper zone local hardware acme.com 192.168.1.1 zone local appliances acme.com zone local via acme.com invia via outvia via zone prefix hardware 408* zone prefix appliances 415* no shut
B. gatekeeper zone local hardware acme.com 192.168.1.1 invia VIA outvia VIA zone local appliances acme.com invia VIA outvia VIA zone local VIA acme.com zone prefix hardware 408* zone prefix appliances 415* no shut
C. gatekeeper zone local hardware acme.com 192.168.1.1 zone local appliances acme.com zone local via acme.com zone prefix hardware 408……. zone prefix appliances 415……. no shut
D. gatekeeper zone local hardware acme.com 192.168.1.1 invia VIA outvia VIA zone local appliances acme.com invia VIA outvia VIA zone prefix hardware 408……. zone prefix appliances 415……. no shut
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 29
DRAG DROP You work as a network administrator at Certkiller .com. You need to explain how a H.323 Gateway is operating for your boss Miss Certkiller. You tell Jack that when a call is placed by an H.323 gateway registered with a gatekeeper, a sequence of RAS messages is exchanged. You are required to place the options in the correct order for an interzone call.
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
Explanation:
Reference:
http://www.cisco.com/en/US/tech/ CK1 077/technologies_tech_note09186a00800c5e0d.shtml
QUESTION 30
SIMULATION
Network topology exhibit:
You work as a network administrator at Certkiller .com. You are giving a lecture for a class of Certkiller trainees. The lecture is on how a gateway registers with a gatekepper. You have set up a lab nVoIP etwork which is displayed in the network topology exhibit. During the demonstration you will be required to configure a Gateway router named Certkiller 1 and a Gatekeeper Router named Certkiller A. Further information:
*
Certkiller 1 has a POTS connection to the PSTN
*
Certkiller 1’s Ethernet connection is shared with Certkiller A.
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
Explanation/Reference:
Explanation:
Certkiller 1#show run
Building configuration…
!
interface Ethernet0/0
ip address 172.16.1.2 255.255.255.0
!!
dial-peer voice 678 voip
destination-pattern 678…….
session target ipv4:172.16.2.1
!
end
!
Certkiller 1#conf t
Certkiller 1(config)#interface Ethernet0/0
Certkiller 1(config-if)#h323-gateway voip interface Certkiller 1(config-if)#h323-gateway voip id Tampa
ipaddr 172.16.1.1 Certkiller 1(config-if)#h323-gateway voip h323-id Gateway_A@ Certkiller .com Certkiller
1(config-if)#h323-gateway voip tech-prefix 1# Certkiller 1(config-if)#exit
Certkiller 1(config)#dial-peer voice 678 voip
Certkiller 1(config-dial-peer)#session target ras Certkiller 1(config-dial-peer)#exit
Certkiller 1(config)#gateway
Certkiller 1(config-gateway)#exit
Certkiller 1(config)#end
Certkiller 1#
!
! Note – the gateway command is very important. The gateway will not register with the gatekeeper
! until you issue the gateway global command on the gateway!!! Gatekeeper Configuration
Certkiller A#conf t
Certkiller A(config)#gatekeeper
Certkiller A(config-gk)#zone local Glasgow Certkiller .com 172.16.1.1 Certkiller A(config-gk)#zone local
Liverpool Certkiller .com Certkiller A(config-gk)#zone prefix Glasgow 813* Certkiller A(config-gk)#zone
prefix Liverpool 678* Certkiller A(config-gk)#gw-type-prefix 1#* default-technology Certkiller A(config-gk)
#no shut
Certkiller A(config-gk)#exit
Certkiller A(config)#end
Certkiller A#
Certkiller A#show gatekeeper endpoints
GATEKEEPER ENDPOINT REGISTRATION
================================
CallSignalAddr Port RASSignalAddr Port Zone Name Type Flags
172.16.1.2 1720 172.16.1.2 60785 Glasgow VOIP-GW H323-ID: Certkiller 1@ Certkiller .com Voice Capacity Max.= Avail.= Current.= 0 Total number of active registrations = 1 Certkiller A#
QUESTION 31
Please study the exhibit carefully. Your customer is using BRIs to the PSTN. Inbound calls can be made without error. However, outbound calls only succeed if there has been a recent inbound call. What can be done to correct this issue?
A. Configure preferences to always select dial peer 3.
B. Configure SPIDs on the BRI so that outbound calls are sent to the correct number.
C. Disable status checking for POTS dial peers so outbound call setup will activate the BRI.
D. Change the dial peer hunt logic so the appropriate dial peer is always used.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 32
Highland Park Property Development is integrating a Cisco Unified CallManager system with the existing PBX via an E1 QSIG trunk. During testing, the first 15 calls work normally. After 15 simultaneous calls, new calls have no audio path when they are established. How can this problem be resolved?
A. Change the channel selection order from descending to ascending.
B. Add the command isdn negotiate-bchan to the serial interface.
C. Add the command isdn contiguous-bchan to the serial interface.
D. Increase the ISDN T302 timer to allow more time for call setup.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 33
Which describes a proper CAC implementation in an H.323 network that uses directory gatekeepers?
A. The directory gatekeeper controls call bandwidth usage between the zones.
B. The zone gatekeepers maintain the bandwidth commands and the directory gatekeeper is only responsible for dial plan resolution.
C. The zone gatekeeper negotiates bandwidth requirements with the target zone gatekeeper by means of an LRQ message forwarded by the directory gatekeeper.
D. The bandwidth commands for each zone that is registered with the directory gatekeeper are included in the directory gatekeeper configuration.
Correct Answer: B Section: (none) Explanation
Explanation/Reference: QUESTION 34
Network topology exhibit
Certkiller 1 partial show running config output exhibit.
Configuration exhibit: You work as a network technician at Certkiller .com. Please study the exhibit carefully. Users calling to Spain from phones connected to the PBX in Helsinki dial the full telephone number. Calls should be re-routed over the WAN to Barcelona instead of using the PSTN connection in Helsinki. However, the calls are being dropped. Troubleshooting indicates that dialed digits are being sent from the PBX in multiple ISDN information messages. The exhibit contains the output from the show running-config command on Router. Which interface configuration will most likely solve the problem?
A. Configuration Certkiller A
B. Configuration Certkiller B
C. Configuration Certkiller C
D. Configuration Certkiller D
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 35
A service provider wants to add SIP devices to an 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. UA server
C. H.323 proxy server
D. SIP proxy server
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Cisco 642-453 Exam Certification Guide presents you with an organized test preparation routine through the use of proven series elements and techniques.“Do I Know This Already?”quizzes open each chapter and allow you to decide how much time you need to spend on each section.Cisco 642-453 lists and Foundation Summary tables make referencing easy and give you a quick refresher whenever you need it.Challenging Cisco 642-453 review questions help you assess your knowledge and reinforce key concepts.Cisco 642-453 exercises help you think about exam objectives in real-world situations, thus increasing recall during exam time.