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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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