9E0-431 (CVOICE) Cisco Voice Over IP Version 3.0

9E0-431 (CVOICE)


Cisco Voice Over IP


Version 3.0

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Note:
Section A contains 90 questions
Section B contains 55 questions.
The total number of questions is 145.


Section A


QUESTION NO: 1
A customer in Great Britain needs to install a Cisco router to support IP Telephony
services with direct-connected analog phones.
What FXS port parameter do you need to change to emulate the local PSTN provider?

A. Signal
B. Cptone
C. Busyout
D. Description

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

Echo Cancellation is enabled
Echo Cancel Coverage is set to 8 ms
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Connection Mode is plar
Connection Number is 2000
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 s
Region Tone is set for US

What is causing the calls to fail?

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.


Answer: A



QUESTION NO: 3
Which three types of trunks does Cisco support with the connection trunk command?

(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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The following configuration is used at Site A:

dial-peer voice 20 pots
destination-pattern 20
port 1.0:1
dial-peer voice 41 voip
destination-pattern 41
session target ipv4:10.2.0.20

The following configuration is used at site B:

dial-peer voice 40 pots
destination-pattern 41
port 1.0:1
dial-peer voice 20 voip
destination-pattern 20
session target ipv4:10.4.1.41

To configure a permanent connection between the PBXs, what must be added to the
voice port configuration at site A?

A. connection trunk 20
B. connection trunk 41
C. connection tie-line 20
D. connection tie-line 41

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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B. forward-digits 7
C. rule 1 9.......312.......
D. num-exp 9.......312.......


Answer: D



QUESTION NO: 7
Which configuration defines a destination pattern for all of the 1000 and 2000 range of
extensions starting with the numbers 555?

A. 5551…
B. 5552…
C. 555[1-2]…
D. 555[1000-2000]…


Answer: C



QUESTION NO: 8
What does RTCP provide?

A. Independent services irrespective of RTP.
B. Compression techniques to save bandwidth.

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?

A. debug voip rtcp
B. debug call control
C. debug voip ccapi inout
D. debug voice call control


Answer: C



QUESTION NO: 11
A voice gateway is a box that ______.

A. Connects two dissimilar networks.
B. Transports voice and restricts data.
C. Can support only a distributed call processing model.
D. Cannot be connected to the traditional PSTN network.


Answer: B



QUESTION NO: 12
You have a customer that operates a group of factories. Each factory has an analog
phone at each location. These phones are connected to an FXS port on the on-site router.
The press operators are unable to make any phone class from these analog phones.

Use the following output to resolve the problem:

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

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 problem?

A. Incorrect cptone
B. Incorrect dial-type
C. Incorrect signal type
D. Incorrect disconnect-ack


Answer: C


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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

How does this affect their voice network bandwidth and delay characteristics?

A. There is no change.
B. Per call delays have increased.
C. Per call bandwidth consumption has increased.
D. Both bandwidth and delay have increased on a per call basis.


Answer: D



QUESTION NO: 14
Which two features render VAD ineffective? (Choose two)

A. Fax
B. CNG
C. Call waiting
D. Music on hold


Answer: A, D



QUESTION NO: 15
A user is trying to call another user over a VoIP network and gets a busy tone instead of
a dial tone.
What command should you use to troubleshoot the problem?

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

QUESTION NO: 17
While installing a voice gateway outside the United States, what two requirements need
to be verified? (Choose two)

A. PSTN standards in that country.
B. Encryption capabilities legalities.
C. The service provider installing the gateway.
D. Supplementary service including fax and modem.


Answer: A, B



QUESTION NO: 18
An MGCP endpoint is identified by a two part identifier that consists of the ______.

A. Telephone number and local name of the user.
B. Telephone number and remote name of the user.
C. Domain name of the user and the IP address of the gateway.
D. Local name of the user and the domain name of the gateway.


Answer: D



QUESTION NO: 19
A customer needs 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.
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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

Answer: B



QUESTION NO: 21
Which request method initiates a SIP call setup?

A. ACK
B. INVITE
C. OPTIONS
D. REGISTER


Answer: B



QUESTION NO: 22
Which show command displays the registration of the gateway with the call agent?

A. show mgcp
B. show gateway mgcp
C. show endpoint mgcp
D. show call active voice


Answer: A

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

QUESTION NO: 25
Your customer is having problems completing calls through the MGCP network.
Which command displays a count of the successful and unsuccessful control commands?

A. show mgcp
B. show mgcp statistics
C. show call active voice
D. show call history voice


Answer: B



QUESTION NO: 26
Which two call control models are based on decentralized call control? (Choose two)

A. SIP
B. CAS
C. H.323
D. MGCP


Answer: A, C



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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

D. dial-peer voice 1 voip
session target sip-server:1.2.3.4


Answer: A



QUESTION NO: 29
SIP is similar to H.225 and SDP is similar to ____.

A. RAS
B. RTP
C. H.245
D. H.323


Answer: C



QUESTION NO: 30
Impedance is set on what type of port?

A. T1
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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

The SIP protocol is based upon which other protocol model?

A. HTML
B. H.323
C. MGCP
D. HTPP/WWW


Answer: D



QUESTION NO: 33
What are two methods that an endpoint can use to determine the address of the
gatekeeper? (Choose two)

A. The endpoint issues a GCP.
B. The endpoint issues a GRQ.
C. The endpoint queries the registrar server.
D. The endpoint is preconfigured to recognize the domain name or IP address of its
gatekeeper.
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Answer: B, D

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

Answer: A, B



QUESTION NO: 36
How is a call defined in the context of MGCP?

A. The path between two telephones.
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B. The RTP sessions between the endpoints.
C. A connection between an endpoint and the call agent.
D. Two or more endpoints sharing the same Call ID and the same media stream.


Answer: D



QUESTION NO: 37
Which two are CS-ACELP coding schemes? (Choose two)

A. G.711
B. G.728
C. G.729

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: 40
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Which application conveys fax using T.37 fax relay?

A. IVR
B. TCL
C. TIFF
D. SMTP


Answer: D



QUESTION NO: 41
Packet switching is an example of what type of multiplexing?

A. Statistical
B. Time division
C. Phase division
D. Frequency division

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

Answer: E
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QUESTION NO: 44
Which four are attributes of a scalable dialing plan? (Choose four)

A. Logic distribution
B. Hierarchical design
C. Simplicity in provisioning
D. Reduction in pre-dial delay
E. reduction in post-dial delay


Answer: A, B, C, E



QUESTION NO: 45
If no incoming dial peer matches a router or gateway, the incoming call leg _____.

E. Takes an alternate path.
F. Matches the default dial peer.
G. Sends a busy to the originator.

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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C. WFQ
D. FIFO
E. FRF.12
F. CBWFQ


Answer: A, C, F



QUESTION NO: 48
Traffic engineering for voice is based on a target ______.

A. Peak of service.
B. Class of service.
C. Grade of service.
D. Quality of service.


Answer: C



QUESTION NO: 49
What are modes of the playout delay buffer?

A. Nominal and full.

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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Answer: B



QUESTION NO: 51
Which three are categories for QoS in a campus network? (Choose three)

A. Queue scheduling
B. Pruning of queues
C. Separation of queues
D. Marking control and management traffic


Answer: A, C, D



QUESTION NO: 52
When does glare occur?

A. When echo cancellers fail to synchronize.
B. When two phones go off-hook at the same time.
C. When two optical wavelengths collide in the same fiber.
D. When both ends of a telephone line or trunk are seized by different users.


Answer: D

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: 55
Which FRF.x standard defines fragmentation for VoIP over Frame Relay?

A. FRF.5
B. FRF.6
C. FRF.11
D. FRF.12


Answer: D



QUESTION NO: 56
Which command shows the status of LLQ on the interface serial 3/2?

A. show class 11q
B. show interface serial 3/2
C. show queue interface serial 3/2
D. show interface serial 3/2 class 11q
E. show policy-map interface serial 3/2


Answer: E

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


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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

C. WFQ
D. WRED
E. Fragmentation


Answer: B, E



QUESTION NO: 59
What component can compensate for jitter?

A. FIFO queuing
B. Ethernet hubs
C. DSP algorithms
D. Playout delay buffer


Answer: D



QUESTION NO: 60
What delay range is considered acceptable according to the G.114 standard?

A. 0 – 150 ms
B. 0 – 250 ms
C. 0 – 400 ms
D. 0 – 500 ms

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

C. Stress
D. Volume


Answer: B



QUESTION NO: 63
Which four does the TCP’s reliable deliver service provide? (Choose four)

A. Flow control
B. Sequenced delivery
C. Unregulated send rate
D. Connectionless service
E. Automatic error recovery
F. Transmission window management


Answer: A, B, E, F



QUESTION NO: 64
You have a customer that is interested in deploying an IP telephony solution in their
organization. The network today is a traditional LAN/WAN The WAN is based on
Frame Relay.

The customer has read about the issues of converging both their data and voice traffic
onto a single network. They are especially concerned about the quality of their calls that

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,

and 8 calls to branch C.
What command allows you to verify the configuration of Call Admission Control on the
headquarters router?

A. show call cac conf
B. show call rsvp-sync conf
C. show call rsvp-sync stats
D. show call rsvp-sync events


Answer: B



QUESTION NO: 66
What is the worst-case compression delay for CD-ACELP?

A. 2.5 ms
B. 5 ms
C. 10 ms
D. 20 ms


Answer: D



QUESTION NO: 67
A call leg is considered what type of connection?

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

QUESTION NO: 69
Which three issues adversely affect voice quality on an IP network? (Choose three)

A. Jitter
B. Delay
C. Packet loss
D. Prioritization
E. Acknowledgment
F. Delivery guarantee


Answer: A, B, C



QUESTION NO: 70
When implementing IPSEC VPNs in the converged network, what is the biggest issue
affecting voice transport?

A. Hop count.
B. Using G.729 as the codec.
C. Throughput considerations.
D. Ensuring only software encryption is running.


Answer: C