9E0-431 (CVOICE) Cisco Voice Over IP Version 3.0
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Copyright
Answer: B
QUESTION NO: 2
Your customer is a computer components warehouse. To keep costs low, all inside sales
associates are located at corporate headquarters in another state.

Your customer is interested in providing a direct analog telephone connection to the
inside sales teams from the pick-up counters at their warehouses. This connection will
not require the customer to dial any digits.
One of the warehouses is having a problem with their sales phone.

Given 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

(Choose three)

A. FXS to FXS trunks
B. FXS to FXO trunks
C. FXO to FXO trunks
D. E&M to FXS trunks
E. E&M to FXO trunks
F. E&M to E&M trunks Answer: A, B, F
QUESTION NO: 4
If no incoming dial peer matches a router or gateway, the incoming call leg _____.

A. Takes an alternate path.
B. Matches the default dial peer.
C. Sends a busy to the originator.
D. Is denied and the call does not complete. Answer: B
QUESTION NO: 5
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Answer: B
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 NO: 6
A telephony service provider sells managed IP Phone service to businesses in multi-
tenant units. The provider 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.

In a Chicago POP, the following dial peer has been configured:

dial-peer voice 312 pots
destination-pattern 312
port 1/0:24

A user dials a local number, 9-555-0597.
What command must be configured in the gateway to allow the call to complete?

A. prefix 312
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C. In-band control information for an RTP flow.
D. Out-of-band control information for an RTP flow. Answer: D
RTCP provides out-of-band control information for an RTP flow.
QUESTION NO: 9
What is the disadvantage of using VoIP rather than VoFR or VoATM?

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. Answer: C
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QUESTION NO: 10
What can you use to verify real-time call control processing in a VoIP network?


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
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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

Ring Cadence is defined by CPTone Selection
Ring Cadance are [20 40] * 100 msec
2611#

What is the problem?

A. Incorrect cptone
B. Incorrect dial-type
C. Incorrect signal type
D. Incorrect disconnect-ack Answer: C 9E0 -431

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QUESTION NO: 13
A company has been using the following dial peer codec command:

Codec g729r8

Over the weekend they reconfigured their dial peers with the following command:

Codec g729ar8 bytes 10


A. show voice dsp
B. show voice connection
C. show voice port summary
D. show dial-peer voice summary Answer: A
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QUESTION NO: 16
What does compressed RTP significantly reduce?

A. Packet delay
B. Total bandwidth
C. Frame Relay overhead
D. Total number of packets Answer: B

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.
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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. Answer: C, D
QUESTION NO: 20
Which protocol negotiates codec type for H.323 sessions?

A. H.225
B. H.245
C. Q.931
D. H.320
QUESTION NO: 23
When gatekeepers communicate with each other, what do they use?

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A. RTP
B. RAS channel
C. call signaling channel
D. H.245 control channel Answer: B
QUESTION NO: 24
To function as a translating gateway, the gateway must ______.

A. Have the capacity to translate the audio.
B. Recognize the call control procedures of both connecting endpoints.
C. Establish separate RTP sessions with the originating and terminating endpoints.
D. Recognize the call control procedures or at least one of the connecting endpoints. Answer: B



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QUESTION NO: 27
Which four functions are supported by an H.323 gatekeeper? (Choose four)

A. Providing services to registered endpoints.
B. Converting an alias address to an IP address.
C. Translation between audio, video, and data formats.
D. Responding to bandwidth requests and modifications.
E. Conversion between call setup signals and procedures.
F. Conversion between communication control signals and procedures.
G. Limiting access to network resources based on call bandwidth restrictions. Answer: A, B, D, G
QUESTION NO: 28
Which command is used to specify the IP address of a SIP proxy server?

A. sip-ua
sip-server ipv4:1.2.3.4
B. sip-ua
sip-server target:1.2.3.4
C. dial-peer voice 1 voip
session target sip:1.2.3.4

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B. FXS
C. FXO
D. E&M Answer: C
QUESTION NO: 31
You have a customer that is deploying an IP telephony solution using MGCP. They
understand that the call agent expects the gateway to use UDP port 2427. The customer
would like to use another port because of a conflict with another application on their
network.

If they want to use port 5000, which command allows the customer to change the UDP
port their call agents and gateway communicate on?

A. Router (config)# mgcp UDP 5000
B. Router (config)# mgcp call-agent 5000
C. Router (config-dial-peer)#application MGCPAPP 5000
D. Router (config)# mgcp default-package gm-package 5000 Answer: B
QUESTION NO: 32

QUESTION NO: 34
Exhibit: In the network shown in the exhibit, if the show gatekeeper calls command
shows a total of five active calls on the gatekeeper, how many call legs would the show
call active voice command display on Gateway A?

A. 1
B. 2
C. 5
D. 6
E. 10 Answer: E
QUESTION NO: 35
Which two use UDP as their transport mechanism? (Choose two)

A. RTP
B. RAS control function
C. call signaling function
D. H.245 control function


D. G-729A Answer: C, D
QUESTION NO: 38
In ISDN, Q.921 signaling equates to which layer of the OSI model?

A. Session
B. Network
C. Transport
D. Data-Link Answer: D
QUESTION NO: 39
Which protocol is designated to allow functionality between two PBX systems from
different manufactures across an ISDN network?

A. QSIG
B. Q.921
C. Q.931
D. T-CCS Answer: A
QUESTION NO: 42
Which three signal types are used by E&M? (Choose three)

A. loop start
B. wink start
C. delay start
D. immediate start Answer: B, C, D
QUESTION NO: 43
Which application enables stock brokerage firms to communicate to multiple remote
offices simultaneously?

A. IP Phone
B. IP Centrex
C. Toll Bypass
D. Multi-tenant
E. Hoot and Holler
H. Is denied and the call does not complete. Answer: B
QUESTION NO: 46
In switchwide queuing, what is the recommended configuration for the transmit
interface?

A. CoS
B. PFC
C. FIFO
D. 2Q1T Answer: D
QUESTION NO: 47
Which three QoS measures, when prompted implemented, affect the outbound queue?
(Choose three)

A. LLQ
B. RSQ
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B. Dynamic and static.
C. Smooth and serrated.
D. Minimum and maximum. Answer: B
QUESTION NO: 50
In a branch office, one VoIP dial-peer has been configured to point to the company
headquarters over a low speed serial link.
Which command would limit the maximum number of concurrent calls to 2?

A. interface serial 3/2
ip rsvp bandwidth 2
B. dial-peer voice 1000 voip
max-conn 2
C. dial-peer voice 1000 voip
max-concurrent 2
D. dial-peer voice 1000 voip
ip rsvp neighbor 2

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QUESTION NO: 53
If a network link is oversubscribed, ______.

A. The link goes down.
B. All voice calls suffer.
C. Voice packets are fragmented.
D. Data packets are given priority.
E. Excess voice calls are dropped. Answer: B
QUESTION NO: 54
CAC is a concept that applies to ____ only.

A. Latency
B. Data traffic
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C. Voice traffic
D. TCP networks Answer: C

QUESTION NO: 57
Why is Frame Relay traffic shaping an important tool for ensuring the delivery of
traffic?

A. It ensures that voice packets are not trapped behind large data packets.
B. It ensures that the priority of the voice packet is higher than the data packets.
C. It ensures that the RTP headed is reduced in size to reduce the overall size of the voice
packet.
D. It ensures that excess traffic above the CIR on the link is not dropped, but is buffered
and sent when there is capacity on the link. Answer: D 9E0 -431

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QUESTION NO: 58
A branch office is using a 128 kbps Frame Relay link to connect to the company
headquarters.
Which two QoS mechanisms should be implemented on the Frame Relay interface to
ensure good voice quality? (Choose two)

A. CIR
B. LLQ


Answer: A
QUESTION NO: 61
Which two factors affect audio quality? (Choose two)

A. Echo
B. Infidelity
C. Delay variation
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D. Transmission medium Answer: A, C
QUESTION NO: 62
If the playout delay buffer size is configured too large, the overall ______ on the
connection may rise to unacceptable levels.

A. Echo
B. Delay

need to cross the WAN.

What are the recommended five major components of QoS for VoIP over Frame Relay?
(Choose five)

A. Fragmentation
B. Traffic shaping
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C. Priority queuing
D. Low Latency Queuing
E. Call Admission Control
F. Link efficiency with cRTP
G. Weighted Random Early Detection
H. Class Based Weighted Fair Queuing Answer: A, B, C, D, F
QUESTION NO: 65
Your customer has deployed VoIP over their WAN. Early in the workday, the quality of
calls between headquarters and the three branch offices is very good, but as the day goes
on and more calls are placed to the branch offices, the quality degrades. Using RSVP,
the WAN bandwidth to the branch offices allows 4 calls to branch A, 6 calls to branch B,

A. Digital
B. Logical
C. Physical
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D. Hardwired Answer: B
QUESTION NO: 68
When the requirement is for users at site A to be able to call users at site B and vice
versa, how many dial peers must be configured for end-to-end calls in both directions?

A. 0
B. 2
C. 3
D. 4 Answer: D