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Exam A
QUESTION 1
You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs are currently connected to T1 ISDN circuits.
Which signaling type will allow you to support your customer?

A. QSIG
B. CCS
C. CAS
D. T-CCS
E. E&M
F. FXO

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 2
You are meeting with a customer that has deployed IP telephony at their headquarters location. They would like to roll out IP telephony to their regional office as well. They are now using the G.711 codec at headquarters. They want to be able to maximize the number of calls carried without impacting voice quality or forcing a WAN upgrade. Which codec would be appropriate for their WAN?
A. G.726
B. G.723.1
C. G.711
D. G.729B

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 3
Refer to the exhibit. Users are not able to complete a call from 678-555-1212 to 770-555-1111. What is the correct diagnosis for the problem?

A. incorrect dial-peer statement in Router 1
B. incorrect port statement in Router 1 pots dial peer
C. incorrect session-target statement in Router 2
D. incorrect destination-pattern in Router 1

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 4
You have been forwarded some questions by a prospective VoIP customer who would like to know the Cisco default sample size for the G.729 codec. What is it?
A. 40 ms
B. 30 ms
C. 20 ms
D. 10 ms

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 5
Examine the example output.
hostname GW1 ! interface Ethernet 0/0 ip address 172.16.2.1 255.255.255.0 h323-gateway voip interface h323-gateway voip id GK1-zone1.abc.com abc.com ipaddr 172.16.2.2 h323-gateway voip h323-id GW1 h323-gateway voip bind srcaddr 172.16.2.1 ! dial-peer voice 1 voip destination-pattern 1212.
session-target ras ! dial-peer voice 2 pots destination-pattern 2125551212 no register e164 ! end
Choose the command that will restore communication with gatekeeper functionality to this device.
A. h323-gateway voip h323-id GK1
B. gateway
C. h323-gateway voip bind srcaddr 172.16.2.2
D. h323-gateway voip GW1-zone2.abc.com abc.com ipaddr 172.16.2.1

Correct Answer: B Section: (none) Explanation
Explanation/Reference:

QUESTION 6
Which preference key word assigns top precedence to a dial peer in a hunt-group?
A. 0
B. priority
C. 1
D. high

Correct Answer: A Section: (none) Explanation
Explanation/Reference: QUESTION 7

You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs use Wink-Start signaling.
Which signaling type will allow you to support the customer?

A. QSIG
B. CCS
C. CAS
D. T-CCS
E. E&M
F. FXO

Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 8
A 9 digit number must be dialed to reach numbers on the PSTN. What process makes sure that the first digit 9 is not transmitted as part of the called number?
A. digit alternating
B. digit masking
C. digit manipulation
D. digit seizing

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 9
What is the E.164 numbering plan?
A. a proprietary PBX number plan
B. the IETF North American number plan
C. the European PBX standard telephony number plan
D. the ITU worldwide number plan

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 10
Refer to the exhibit. What is the minimum WAN bandwidth required to support three simultaneous VoIP calls in this network?

A. 19,200 bps
B. 51,600 bps
C. 79,200 bps
D. 247,200 bps

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 11
In the connection between a Cisco router and an E&M port on a PBX, which side is generally the Cisco side?
A. loop start
B. trunk circuit
C. switch port
D. signaling unit

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 12
Which dial plan characteristic shows the most obvious improvement by dropping a number translation step?
A. availability
B. post-dial delay
C. scalability
D. hierarchical design

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 13
What are two basic parameters needed to setup a dial peer connected to the PSTN? (Choose two.)
A. voice port
B. signaling type
C. interface bandwidth
D. destination pattern

Correct Answer: AD Section: (none) Explanation
Explanation/Reference:
QUESTION 14
Which device is used to allow an H.323 stream to transit a firewall?
A. gatekeeper
B. gateway
C. proxy
D. MCU

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 15
You are working with your customer in their lab to test the effect of jitter on voice quality. You have set the maximum playout delay to 40 ms on the voice enabled routers. What will be the impact on voice quality if after severe congestion the playout buffer empties and the source sends packets to the buffer faster than they are leaving?
A. There will be no noticeable drop in quality.
B. The jitter buffer will adapt to the faster-arriving packets by expanding the buffer size.
C. The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.
D. After the jitter buffer fills up, subsequent packets are discarded.

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 16
Refer to the exhibit. Your customer wants to converge voice and data on the existing T1 Frame Relay WAN link between New York and Atlanta. The customer has allocated 25 percent of the WAN link for routing updates and other overhead. You are using 6 bytes of overhead for Frame Relay, no cRTP, and the G.729 codec.
How many calls could be placed on this link?

A. two
B. three
C. four
D. five
E. six
F. seven

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 17
In a VoIP environment when speech samples are framed every 20 ms, a payload of 20 bytes is generated. Assuming a total packet length of 60 bytes, what is the length of the packet header if cRTP is deployed without redundancy checks?
A. 1 byte
B. 2 bytes
C. 3 bytes
D. 4 bytes
E. 20 bytes
F. 40 bytes

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 18
You have a customer that is interested in determining the number of VoIP calls their Frame Relay WAN links can support. Each of their Frame Relay WAN links has 84 kbps of bandwidth available outside all other applications and overhead. How many G.729 calls using the 8 kbps codec and 20 byte sample size can be supported?
A. 1
B. 2
C. 3
D. 4

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 19
You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs use an in-band signaling type.
Which signaling type will allow you to support your customer?

A. QSIG
B. CCS
C. CAS
D. T-CCS
E. E&M
F. FXO

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 20
A network has the following characteristics:
?the use of the G.711 codec with a codec speed of 64 kbps ?a 160-byte sample size ?the use of Frame Relay without compressed Real-Time Transport Protocol (CRTP) ?FRF.12 with 6 bytes of overhead
What minimum WAN bandwidth would be required to support three simultaneous VoIP calls?
A. 247200 bps
B. 19200 bps
C. 79200 bps D. 51600 bps

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 21
At what point does the MGCP call agent release the setup of the call path to the residential gateways?
A. after the call agent has been notified that an event occurred at the source residential gateway
B. after the call agent has been notified of an event and has instructed the source residential gateway to create a connection
C. does not release call path setup
D. after the call agent has sent a connection request to both the source and destination and has relayed a modify-connection request to the source so that the source and destination can set up the call path
E. after the call agent has forwarded session description protocol information to the destination from the source and has sent a modify connection to the destination and a create-connection request to the source

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 22
Refer to the exhibit. You have been asked to configure a dial peer on R2 that will match only the extensions of the four telephones attached. Which dial-peer statement will you use?

A. dial-peer voice 1 pots destination-pattern 5552.[0-5]0
B. dial-peer voice 1 pots destination pattern 5552[5-6].0
C. dial-peer voice 1 pots destination-pattern 555[2-5][56]
D. dial-peer voice 1 pots destination-pattern 5552[5-6][05]0

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 23
King’s Mountain Cable has a pair of voice enabled routers capable of supporting only high complexity codecs. They need to conserve bandwidth on WAN links without major impact to call quality. Which two codecs satisfy these requirements? (Choose two.)
A. G.729
B. G.729a
C. G.729b
D. G.729ab

Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
QUESTION 24
Which gateway interface connects to the standard station port of a PBX?
A. FXS
B. E&M
C. POTS
D. FXO

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 25
Your customer has forwarded this diagram and configuration. The customer wishes to have a connection between its PBXs, a connection that is created and dropped as required. There is one configuration statement missing from each router. What are the two missing statements? (Choose two.)

A. connection trunk 2015551000404555?
B. connection trunk 4045551200
C. connection tie-line 4045551200
D. connection tie-line 404555?
E. connection tie-line 2015551000
F. connection trunk

Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
QUESTION 26
Refer to the exhibit. What is the minimum WAN bandwidth required to support three simultaneous VoIP calls in this network?

A. 19,200 bps
B. 51,600 bps
C. 79,200 bps
D. 247,200 bps

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 27
Which process changes an internal extension into a fully qualified external PSTN number before matching to a dial peer?
A. digit masking
B. forward digits
C. number expansion
D. prefix extension

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 28
Which type of signaling is DTMF?
A. supervisory
B. route
C. informational
D. address

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 29
Which type of delay is caused when large data packets block voice packets from the outbound interface?
A. queuing delay
B. serialization delay
C. propagation delay
D. packetization delay

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 30
Drop

A.
B.
C.
D.

Correct Answer: Section: (none) Explanation
Explanation/Reference:

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Exam A
QUESTION 1
You have a pair of voice enabled routers that have the capability of supporting only high complexity codecs. You need to conserve bandwidth on WAN links without major impact to call quality. Which codecs will satisfy these requirements? (Choose two.)
A. G.729
B. G.729A
C. G.729B
D. G.729.AB

Correct Answer: AC Section: (none) Explanation
Explanation/Reference:
QUESTION 2
When does the MGCP call agent release the setup of the call path to the residential gateways?
A. after the call agent has been notified that an event occurred at the source residential gateway
B. after the call agent has been notified of an event and has instructed the source residential gateway to create a connection
C. The call agent is never out of the call path setup.
D. after the call agent has sent a connection request to both the source and destination and has relayed a modify-connection request to the source so that the source and destination can set up the call path
E. ater the call agent has forwarded session description protocol information to the destination from the source and has sent a modify connection to the destination and a create-connection request to the source

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 3
The following are the original dial peer configurations for routers R1 and R2:R1:dial-peer voice 20 voipdestination-pattern 408…….session target ipv4:192.168.2.254!R2:dial-peer voice 21 potsdestination-pattern 4085554321port 1/0/1!Which phones can call to the other?

A. Only Phone A can call Phone B.
B. Only Phone B can call Phone A.
C. Both phones can call each other.
D. Neither phone can call the other.

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 4
Examine the following PBX system parameters: The calling side seizes the line by going off-hook on its E-lead and sends information as DTMF digits. The voice path is 4-wires, and the voice enabled router is in another building from the PBX.Select the correct set of commands to allow communication between a voice enabled router and a PBX.
A. voice port 1/0/0 signal immediate-start operation 4-wire type 2
B. voice-port 1/0/0 signal delay-dial operation 4-wire type 1
C. voice port 1/0/0 signal wink-start operation 4-wire type 3
D. voice port 1/0/0 signal immediate-start operation 4-wire type 4

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 5
Which device is used to allow an H.323 stream to transit a firewall?
A. gatekeeper
B. gateway
C. proxy
D. MCU

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 6
One voice packet is lost between Phone A and Phone B. What will be the result to the listener?

A. The call is terminated.
B. The listener will experience a gap in the received audio stream.
C. The listener will hear the audio normally. Packet loss concealment will make the loss inaudible.
D. The listener will hear the audio out of order when the lost packet is retransmitted.

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 7
Refer to the graphic for IP addresses and telephone numbers. You are working with a customer that is opening a small sales office in London. You would like to be able to have the user in London be able to dial into the PBX in New York over the IP WAN. The New York PBX uses loop start, a two-wire operation, and DTMF dialing. Please choose the correct FXO port configuration for New York.

A. voice-port 1/0/0 signal loop-start operation 2-wire dial-type dtmf
B. voice-port 1/1/1 destination 2015551212 signal loop-start operation 2-wire type 1 dial-type dtmf
C. voice port 1/0/0 session target ipv4:172.16.1.1 destination 2015551212 signal loop-start operation 2-wire dial-type dtmf

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 8
Which statement is true about the MGCP call agent?
A. acts only as a recorder of call details
B. provides only call signaling and call setup
C. manages all aspects of the call and voice stream
D. monitors the quality of each call after setup

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 9
What is the E.164 numbering plan?
A. a proprietary PBX number plan
B. the IETF North American number plan
C. the European PBX standard telephony number plan
D. the ITU worldwide number plan

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 10
Refer to the exhibit. You have been asked to configure a dial peer on R2 that will match only the extensions of the four telephones attached. Which dial-peer statement will you use?

A. dial-peer voice 1 pots destination-pattern 5552.[0-5]0
B. dial-peer voice 1 pots destination pattern 5552[5-6].0
C. dial-peer voice 1 pots destination-pattern 555[2-5][56]
D. dial-peer voice 1 pots destination-pattern 5552[5-6][05]0

Correct Answer: D Section: (none) Explanation
Explanation/Reference: QUESTION 11
You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs use a proprietary signaling type.Which signaling type will allow you to support your customer?

A. E&M
B. CCS
C. CAS
D. T-CCS
E. FXO
F. FXS

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 12
What are the three components in an MGCP environment? (Choose three.)
A. gateway
B. gatekeeper
C. endpoint
D. call agent
E. proxy server

Correct Answer: ACD Section: (none) Explanation
Explanation/Reference:

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Exam A
QUESTION 1
You are the voice technician at Certkiller . Certkiller has its offices in Great Britain. You need to install a
Cisco router to support IP Telephony services with direct-connected analog phones. You need to emulate
the local PSTN provider.
What FXS port parameter do you need to change?

A. Pulse
B. Signal
C. Cptone
D. Busyout
E. Description
Correct Answer: C Section: (none) Explanation
QUESTION 2
Certkiller distributes computer components and has warehouses in New York and Chicago. Headquarters is located in Washington, DC. To keep costs low, all inside sales associates are located at headquarters. Your want to provide a direct analog telephone connection to the inside sales teams from the pick-up counters at the warehouses. This connection should not require the inside sales teams to dial any digits. One of the warehouses is having a problem with their sales phone. You receive the following output: altwhse#show voice port 1/0:1 Foreign Exchange Office Type of VoicePort is E&M Operation State is DORMANT Administrative State is UP The Last Interface Down Failure Cause is Administrative Shutdown Description is not set Noise Regeneration is enabled Non Linear Processing is enabled Music On Hold Threshold is Set to -38 dBm In Gain is Set to 0 dB Out Attenuation is Set to 0 dB Echo Cancellation is enabled Echo Cancel Coverage is set to 8 ms Connection Mode is plar Connection Number is 2000 Initial Time Out is set to 10 s Interdigit Time Out is set to 10 s Ringing Time Out is set to 180 s Region Tone is set for US What is the cause of the problem?
A. VoicePort type is incorrect.
B. Echo cancellation is enabled.
C. Connection Number is not required.
D. Interdigit Time Out is set to 10 seconds.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 3
You are the Voice technician at Certkiller . Your newly appointed Certkiller trainee wants to know what types of trunks Cisco support with the connection trunk command. What will your reply be? (Choose three)
A. FXS to FXS trunks, FXS to FXO trunks, and FXS to E&M trunks
B. FXS to FXS trunks, FXS to FXO trunks, and E&M to E&M trunks
C. FXS to FXS trunks, FXO to FXO trunks, and E&M to E&M trunks
D. FXO to FXS trunks, FXO to FXO trunks, and E&M to E&M trunks
E. FXS to FXS trunks, FXS to E&M trunks, and E&M to E&M trunks

Correct Answer: B Section: (none) Explanation
QUESTION 4
What happens if no incoming dial peer matches a router or gateway?
A. The incoming call leg takes an alternate path.
B. The incoming call leg matches the default dial peer.
C. The incoming call leg sends a busy to the originator.
D. The incoming call leg is denied and the call is dropped.
Correct Answer: B Section: (none) Explanation
QUESTION 5
You are the network engineer at Certkiller . Certkiller has its headquarters in New York and a branch office in New Hamshire. You want to configure a permanent connection between the PBX at headquarters and the PBX at the branch office. The following configuration is used at the New York site: destination-pattern 20 port 1.0:1 destination-pattern 41 session target ipv4:10.2.0.20 The following configuration is used at the New Hamshire site: destination-pattern 41 port 1.0:1
dial-peer voice 41 voip destination-pattern 20 session target ipv4:10.4.1.41 What must be added to the voice port configuration at the New York site?
A. connection trunk 20
B. connection trunk 41
C. connection tie-line 20
D. connection tie-line 41
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
You must specify the same number in the connection trunk voice port command as in the appropriate dial
peer destination-pattern command in order to create a permanent trunk.

QUESTION 6
Certkiller sells managed IP Phone service to businesses in multi-tenant units. Certkiller has POPs in many
cities, so all of their dial peer patterns are based on 10 digit numbers.
Users dial 9 for local calls, followed by the 7 digital local number.
The following dial peer has been configured in a New York POP:
destination-pattern 595
port 1/0:24
A user dials a local number, 94422.
What command must be configured in the gateway to allow the call to complete?

A. prefix 595
B. forward-digits 7
C. rule 1 9…….595…….

D. forward 9…….595…….

E. num-exp 9…….595…….
Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 7
You are the Voice technician at Certkiller . Your newly appointed Certkiller trainee wants to know what
configuration would define a destination pattern for all of the 1000 and 2000 range of extensions starting
with the numbers 555.
What will your reply be?

A. 5551…
B. 5552…
C. 555[1-2]…
D. 555[100-200]…
E. 555[1000-2000]…
Correct Answer: C Section: (none) Explanation
QUESTION 8
You are the Voice technician at Certkiller . The Certkiller network uses RTCP. Your newly appointed
Certkiller trainee wants to know what RTCP does.
What will your reply be?

A. It provides independent services irrespective of RTP.
B. It provides compression techniques to save bandwidth.
C. It provides in-band control information for an RTP flow.
D. It provides out-of-band control information for an RTP flow.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation:
RTCP provides out-of-band control information for an RTP flow.

QUESTION 9
You are the Voice technician at Certkiller . The Certkiller network uses VoIP. Your newly appointed Certkiller trainee wants to know what the disadvantage of using VoIP rather than VoFR or VoATM are. What will your reply be?
A. Data can arrive out of sequence.
B. Networks are complicated to design.
C. Data units can arrive out of sequence.
D. Network failures are not automatically found.
Correct Answer: C Section: (none) Explanation
QUESTION 10
You are the network engineer at Certkiller . You have configured real-time call control processing on the
Certkiller VoIP network. You want to verify this configuration.
What command should you use?

A. debug voip rtcp
B. debug call control
C. debug voip ccapi inout
D. debug voip call control
E. debug voice call control
Correct Answer: C Section: (none) Explanation
QUESTION 11
You are the network engineer at Certkiller . Your newly appointed Certkiller trainee wants to know what a
voice gateway is.
What will your reply be?

A. It is a device that connects two dissimilar networks.
B. It is a device that transports voice and restricts data.
C. It is a device that can support only a distributed call processing model.
D. It is a device that cannot be connected to the traditional PSTN network.
Correct Answer: B Section: (none) Explanation
QUESTION 12
Certkiller has its headquarters in New York and branch offices in Delaware, Detroit and Denver. Each office has an analog phone at each location. These phones are connected to an FXS port on the on-site router. The Finance department at the Denver office is unable to make any phone class from these analog phones. You receive the following output: 2611#s voice port 1/0/0 Foreign Exchange Station 1/0/0 Slot is 1, Sub-unit is 0, Port is 0 Type of VoicePort is FXS Operation State is DORMANT Administrative State is UP No Interface Down Failure Description is not set Noise Regeneration is enabled Non Linear Processing is enabled Non Linear Mute is disabled Non Linear Threshold is -21 dB Music On Hold Threshold is Set to 38 dBm In Gain is Set to 0 dB Out Attention is Set to 3 dB Echo Cancellation is enabled Echo Cancellation NLP mute is disabled Echo Cancellation NLP threshold is -21 dB Echo Cancel Coverage is set to default Playout-delay Mode is set to default Playout-delay Nominal is set to 60 ms Playout-delay Maximal is set to 200 ms Playout-delay Minimum mode is set to default, value 40 ms Playout-delay Fax is set to 300 ms Connection Mode is normal Connection Number is not set Initial Time Out is set to 10 s Interdigit Time Out is set to 10 s Call Disconnect Time Out is set to 60 s Ringing Time Out is set to 180 Wait Release Time Out is set to 30 s Companding Type is u-law Region Tone is set for US Analog Info Follows: Currently processing none Maintenance Mode Set to None (not in mtc mode) Number of signaling protocol errors are 0 Impedance is set to 600r Ohm Station name None, Station number None Voice card specific Info Follows: Signal Type is groundStart Ring Frequency is 25 Hz Hook Status is On Hook Ring Active Status is inactive Ring Ground Status is inactive Tip Ground Status is inactive Digit Duration Status is inactive Digit Duration Timing is set to 100 ms InterDigit Duration Timing is set to 100 ms No disconnect acknowledge Ring Cadence is defined by CPTone Selection Ring Cadance are [20 40] * 100 msec 2611# What is the cause of this problem?
A. The cptone is incorrect
B. The dial-type is incorrect
C. The signal type is incorrect
D. The playout-delay is incorrect
E. The disconnect-ack is incorrect
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 13
You are the network engineer at Certkiller . Certkiller has been using the following dial peer codec command: Codec g729r8 You reconfigure the dial peers with the following command: Codec g729ar8 bytes 10 How will this reconfiguration affect the voice network bandwidth and delay characteristics? (Choose two.)
A. There will be no change.
B. Delay will increase on a per call basis.
C. Delay will decrease on a per call basis.
D. Bandwidth consumption will decrease on a per call basis.
E. Bandwidth consumption will increase on a per call basis.
Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
QUESTION 14
You are the network engineer at Certkiller . Your newly appointed Certkiller trainee wants to know which
features render VAD ineffective.
What will your reply be? (Choose two.)

A. Fax
B. CNG
C. Call waiting
D. Music on hold
E. Call forwarding
Correct Answer: AD Section: (none) Explanation
QUESTION 15
You are the VoIP engineer at Certkiller . A Certkiller user complains that she gets a busy tone instead of a
dial tone when she tries to call another user. You want to troubleshoot this problem.
What command should you use?

A. show voice dsp
B. show voice path
C. show voice connection
D. show voice port summary
E. show dial-peer voice summary
Correct Answer: A Section: (none) Explanation
QUESTION 16
You are the Voice engineer at Certkiller . Your newly appointed Certkiller trainee wants to know what
compressed RTP does.
What will your reply be?

A. It significantly reduce packet delay
B. It significantly reduce total bandwidth
C. It significantly reduce Frame Relay overhead
D. It significantly reduce the total number of packets
Correct Answer: B Section: (none) Explanation
QUESTION 17
You are the network engineer at Certkiller . Certkiller has its offices in London. You are installing a voice
gateway.
What do you need to verify? (Choose two.)

A. The PSTN standards in England.
B. Encryption capabilities legalities.
C. The service provider installing the gateway.
D. Supplementary service including fax and modem.
Correct Answer: AB Section: (none) Explanation
QUESTION 18
What identifies an MGCP endpoint?
A. A two part identifier that consists of the telephone number and local name of the user.
B. A two part identifier that consists of the telephone number and remote name of the user.
C. A two part identifier that consists of the domain name of the user and the IP address of the gateway.
D. A two part identifier that consists of the local name of the user and the domain name of the gateway.
Correct Answer: D Section: (none) Explanation
QUESTION 19
You are the network engineer at Certkiller . You to connect a Cisco voice gateway to a PBX or the PSTN
via ISDN (PRI, QSIG, BRI).
What are two attributes of the PBX/PSTN switch that must be known to understand which features to
configure on the voice gateway to connect successfully to it? (Choose two)

A. Whether Q.921 or Q.931 is supported by the PBX/PSTN switch.
B. Whether Symmetric mode is supported by the PBX/PSTN switch.
C. Which PRI/BRI switch-type is supported by the PBX/PSTN switch.
D. Whether network or user side is supported by the PBX/PSTN switch.
E. Whether wink, delay dial, or immediate dial is supported by the PBX/PSTN switch.
Correct Answer: CD Section: (none) Explanation
QUESTION 20
Your newly appointed Certkiller trainee wants to know what protocol negotiates the codec type for H.323
sessions.
What will your reply be?

A. H.225
B. H.245
C. Q.931
D. Q.932
E. H.320
Correct Answer: B Section: (none) Explanation
QUESTION 21
You are the Voice technician at Certkiller . Your newly appointed Certkiller trainee wants to know what
request method initiates a SIP call setup.
What will your reply be?

A. ACK
B. INVITE
C. OPTIONS
D. REGISTER
E. DISCOVER
Correct Answer: B Section: (none) Explanation
QUESTION 22
You are the network engineer at Certkiller . You want to verify the registration of the gateway with the call
agent.
Which show command should you use?

A. show mgcp
B. show call agent
C. show gateway mgcp
D. show endpoint mgcp
E. show call active voice
Correct Answer: A Section: (none) Explanation
QUESTION 23
You are the Voice technician at Certkiller . Your newly appointed Certkiller trainee wants to know what
makes it possible for gatekeepers to communicate with each other.
What will your reply be?

A. RTP
B. RAS channel
C. call signaling channel
D. H.245 control channel
E. Q.931 control channel
Correct Answer: B Section: (none) Explanation
QUESTION 24
What does gateway require to function as a translating gateway?
A. The capacity to translate the audio.
B. The ability to recognize the call control procedures of both connecting endpoints.
C. The ability to establish separate RTP sessions with the originating and terminating endpoints.
D. The ability to recognize the call control procedures for at least one of the connecting endpoints.
Correct Answer: B Section: (none) Explanation
QUESTION 25
You are the Voice engineer at Certkiller . Numerous Certkiller users complain that they are unable to
complete calls through the MGCP network. You want to verify the extent of the problem by reviewing a
count of the successful and unsuccessful control commands.
Which command should you use?

A. show mgcp
B. show mgcp count
C. show mgcp statistics
D. show call active voice
E. show call history voice
Correct Answer: C Section: (none) Explanation
QUESTION 26
Which of the following call control models are based on decentralized call control? (Choose two.)
A. SIP
B. CAS
C. H.323
D. Q.931
E. MGCP
Correct Answer: AC Section: (none) Explanation
QUESTION 27
You are the Voice engineer at Certkiller . Certkiller has an H.323 gatekeeper. Your newly appointed
Certkiller trainee wants to know what functions are supported by this gatekeeper.
What will your reply be? (Choose four.)

A. It provides services to registered endpoints.
B. It converts an alias address to an IP address.
C. It responds to bandwidth requests and modifications.
D. It provides translation between audio, video, and data formats.
E. It provides conversion between call setup signals and procedures.
F. It limits access to network resources based on call bandwidth restrictions.
G. It provides conversion between communication control signals and procedures.
Correct Answer: ABCF Section: (none) Explanation QUESTION 28
You are the network engineer at Certkiller . You are configuring a connection to a SIP proxy server. Which command would you use to specify the IP address of the server?
A. sip-ua sip-server 2.3.4
B. sip-ua sip-server target:1.2.3.4
C. dial-peer voice 1 voip session target sip:1.2.3.4
D. dial-peer voice 1 voip session target sip-server:1.2.3.4
Correct Answer: A Section: (none) Explanation
QUESTION 29
With regard to SIP and SDP, which of the following statements is true?
A. SIP is similar to RAS and SDP is similar to RTP
B. SIP is similar to RTP and SDP is similar to RAS
C. SIP is similar to H.225 and SDP is similar to H.245
D. SIP is similar to H.245 and SDP is similar to H.323
E. SIP is similar to H.323 and SDP is similar to H.225
Correct Answer: C Section: (none) Explanation
QUESTION 30
You are the Voice technician at Certkiller 60. Your newly appointed Certkiller trainee wants to know on
what type of port you would set impedance.
What will your reply be?

A. T1
B. E1
C. FXS
D. FXO
E. E&M
Correct Answer: D Section: (none) Explanation
QUESTION 31
You are the network engineer at Certkiller . You are deploying an IP telephony solution using MGCP. The call agent expects the gateway to use UDP port 2427 but an application on the Certkiller network is already using that port. You want to use port 4662 instead. Which command would allow you to change the UDP port that the call agents and gateway communicate on?
A. Router(config)# mgcp UDP 4662
B. Router(config)# mgcp gateway 4662
C. Router(config)# mgcp call-agent 4662
D. Router(config-dial-peer)#application MGCPAPP 4662
E. Router(config)# mgcp default-package gm-package 4662
Correct Answer: C Section: (none) Explanation

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