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Exam
: Cisco 642-432
Title
: Cisco® Voice Over IP
Version : Demo
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1.In T1 CAS, where are the signaling states and control features carried for Super Frame robbed-bit
signaling?
A. 6th and 12th frame
B. 6th, 12th, 18th, and 24th frame
C. the first and seventeenth time slot
D. the first and sixteenth time slot
Answer: A
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
Answer: D
3.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
Answer: C
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.
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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
Answer: A
5.Examine the example output.
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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
Answer: B
6.Examine the output.
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Your customer has sent you their MGCP gateway configuration. They are unable to get the gateway to
communicate with the call agent. What command needs to be inserted to resolve the problem?
A. ccm-manager mgcp 172.16.1.1
B. mgcp call-agent 172.16.1.1
C. application MGCPAPP 172.16.1.1
D. mgcp 5036 172.16.1.1
Answer: B
7.Which command parameter specifies that the router should not attempt to initiate a trunk connection but
should wait for an incoming call before establishing the trunk?
A. codec clear-channel
B. connection-trunk 404555.... answer-mode
C. voice-port 1/0:1
D. ds0-group timeslots 1-23 type ext-sig
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Answer: B
8.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
Answer: B
9.In a VoIP environment when speech samples are framed every 20 ms, a payload of 20 bytes is generated.
What is the size of the combined IP, UDP, and RTP headers?
A. 40 bytes
B. 12 bytes
C. 20 bytes
D. 8 bytes
E. 4 bytes
F. 2 bytes
Answer: A
10. A customer would like to be able to retire their existing permanent PSTN trunk connection between their
PBXs and migrate to permanent connections over the IP WAN. There is one configuration statement
missing from each router in the figure. What are the two missing statements? (Choose two.)
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A. connection tie-line e&m
B. connection trunk 4045551200
C. connection tie-line 2015551000
D. connection trunk 2015551000
E. connection tie-line 4045551200
F. connection tie-line
Answer: BD
11. 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.)
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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
Answer: CE
12. 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?
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A. E&M
B. CCS
C. CAS
D. T-CCS
E. FXO
F. FXS
Answer: D
13.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
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C. 3
D. 4
Answer: C
14. 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
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F. FXO
Answer: C
15. 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
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Answer: A
16. 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.
Answer: D
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