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ExamPDF




Exam : 642-436

Title : Cisco Voice over IP

(CVOICE)



Version : Demo











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1. 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
Answer: D
2. Refer to the exhibit. When extension 201-555-1000 dials 404-555-1200, how are the digits manipulated
in R1 so that they are presented correctly at R2?
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A. The outbound VoIP dial peer is matched and all digits are sent.
B. The digits 404-555 are stripped off before matching the outbound POTS dial peer.
C. The digits 404-555 are stripped off by the connection trunk and R2 receives only 1200.
D. R1 collects the 1200 and prepends the tie-line digits 404555. That number is matched to a VoIP dial
peer and sent to the appropriate address.
Answer: A
3. Refer to the exhibit. Your customer wants to converge the existing PBX network with the IP network.
The three remote offices have various types of PBXs. The customer is using a combination of tie-lines
and trunks to connect the PBXs today.
Which kind of connection should be implemented to allow calls to be placed from 201-555-1000 to
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727-555-1000 so that when the call is completed, network resources are returned for other uses?
A. PLAR
B. trunk
C. tie-line
D. answer-mode
Answer: C
4. 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
Answer: B
5. Which option is true concerning the MGCP call agent?
A. acts only as a recorder of call details
B. provides only call signaling and call setup
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C. manages all aspects of the call and voice stream
D. monitors the quality of each call after setup
Answer: B
6. 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
Answer: D
7. Refer to the exhibit for IP addresses and telephone numbers. You are working with a customer opening
a small sales office in Atlanta. You want the user in Atlanta to be able to dial into the PBX in New York over
the IP WAN. The New York PBX uses ground start, a two-wire operation, and DTMF dialing.
Choose the correct FXO port configuration commands for New York.
A. voice-port 1/0/0
signal ground-start
operation 2-wire
dial-type dtmf
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B. voice-port 1/1/1
destination 2015551212
signal ground-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 ground-start
operation 2-wire
dial-type dtmf
D. voice port 1/0/0
session target ipv4:172.16.1.1
source 2015551212
signal wink-start
operation 2-wire
dial-type dtmf
Answer: A
8. Refer to the exhibit.
Lighthorse Equine Management would like to investigate converging voice and data on their existing T1
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Frame Relay WAN link between New York and Atlanta. Currently the following list of applications are
consuming no more bandwidth than what is listed on this segment of the network.
T1 link 1536 kbps
e-mail 75 kbps
internet 200 kbps
Oracle 500 kbps
FTP 250 kbps
Total 1025 kbps
The customer has allocated 25% of the WAN link for routing updates and other overhead. They would like
to increase the number of samples encapsulated in each PDU to 40 ms. You have calculated 6 bytes of
overhead for Frame Relay, no cRTP, and the use of the G.711 codec.
How many simultaneous calls could be placed on this link?
A. 0 calls
B. 1 call
C. 2 calls
D. no more than 5 calls
E. no more than 10 calls
F. no more than 20 calls
Answer: B
9. Refer to the exhibit. A QoS strategy has already been deployed on the LAN. Choose three WAN QoS
best practices that should be used over the WAN link. (Choose three.)
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A. Implement NBAR.
B. Implement admission control.
C. Mark voice traffic as EF in DSCP.
D. Mark voice traffic highest priority in 802.1p.
E. Use cRTP to maximize bandwidth utilization.
F. Configure access switches to trust traffic from IP phones.
Answer: BCE
10. When setting up a VoIP call, what is the first thing a gateway router tries to match to a dialed number?
A. call leg
B. IP route
C. session target
D. destination pattern
Answer: D
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