[Free] 2017(Apr) Ensurepass Passguide Cisco 400-051 Latest Dumps 21-30

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CCIE Collaboration Written Exam

QUESTION 21

What is the minimum number of TCP sessions needed to complete a H.323 call between two H.323 gateways using slow start?

 

A.

0

B.

1

C.

2

D.

3

E.

4

 

Correct Answer: C

Explanation:

H.323 has two modes of operation: slow start and fast start. The initiation of a call may proceed in a slow start or fast start in H.323. In a slow start, H.323 signaling consists of Setup, Call Proceeding, Alerting, and Connect steps. After these steps, the H.245 media negotiation is performed. When a call is initiated in H.323 fast start, the H.245 media negotiation is performed within the initial Setup message. With slow start, multiple TCP connections are needed for an H.323 call, such as one H.225 signaling channel and one H.245 signaling channel if required (minimum of these two).

QUESTION 22

Refer to the exhibit. You received this debug output to troubleshoot a Cisco IOS MGCP gateway media-related problem at a customer site. What is the purpose of this message?

 

clip_image002

 

A.

The MGCP gateway is responding to an RQNT message from Cisco Unified Communications Manager to poll the media capabilities on its endpoints.

B.

The MGCP gateway is responding to an AUEP message from Cisco Unified Communications Manager to poll the media capabilities on its endpoints.

C.

The MGCP gateway is responding to an AUCX message from Cisco Unified Communications Manager to poll the active calls on its endpoints.

D.

The MGCP gateway is responding to an MDCX message from Cisco Unified Communications Manager during a call setup.

E.

The MGCP gateway is responding to a CRCX message from Cisco Unified Communications Manager during a call setup.

 

Correct Answer: D

Explanation:

See MGCP packet debugging examples and their meanings at the Reference link below.

 

Reference:

Sample of Debug MGCP Packets

http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/42104-debug-mgcp.html

 

 

QUESTION 23

Refer to the exhibit. You received this debug output to troubleshoot a Cisco IOS MGCP gateway media-related problem at a customer site. What is the purpose of this message?

 

clip_image004

 

A.

The MGCP gateway is responding to an RQNT message from Cisco Unified Communications Manager to poll the media capabilities on its endpoints.

B.

The MGCP gateway is responding to an AUEP message from Cisco Unified Communications Manager to poll the media capabilities on its endpoints.

C.

The MGCP gateway is responding to an AUCX message from Cisco Unified Communications Manager to poll the active calls on its endpoints.

D.

The MGCP gateway is responding to an MDCX message from Cisco Unified Communications Manager during a call setup.

E.

The MGCP gateway is responding to a CRCX message from Cisco Unified Communications Manager during a call setup.

 

Correct Answer: E

 

 

QUESTION 24

Refer to the exhibit. If this SIP call is initiated using early offer, which SI
P message will UA#2 use to communicate its media capability to UA#1?

 

clip_image005

 

A.

INVITE

B.

180 Ringing

C.

200 OK

D.

ACK

E.

RTP Media

 

Correct Answer: C< /font>

Explanation:

In Early offer, SIP Send SDP in the invite, the other node will send the SDP in the 200 message.

 

 

QUESTION 25

When a Cisco IOS gatekeeper receives an LRQ, what is the first step it will take in an attempt to resolve the destination address?

 

A.

Check to see if the LRQ reject-unknown-prefix flag is set.

B.

Check to see if the destination address matches the technology prefix.

C.

Check to see if the destination address matches the hop-off technology prefix.

D.

Check to see if the destination address matches the remote zone prefix.

E.

Check to see if the LRQ forward-queries flag is set.

 

Correct Answer: B

Explanation:

LRQ — These messages are exchanged between gatekeepers and are used for inter-zone (remote zone) calls. For example, gatekeeper A receives an ARQ from a local zone gateway requesting call admission for a remote zone device. Gatekeeper A then sends an LRQ message to gatekeeper B. Gatekeeper B replies to the LRQ message with either a Location Confirm (LCF) or Location Reject (LRJ) message, which depends on whether it is configured to admit or reject the inter-zone call request and whether the requested resource is registered.

 

 

QUESTION 26

Refer to the exhibit. Which DTMF relay method is advertised when the originating SIP gateway sends an INVITE message with a Call-Info header shown?

 

clip_image007

 

A.

RFC 2833

B.

SIP INFO

C.

SIP NOTIFY

D.

SIP KPML

E.

In-band audio

 

Correct Answer: C

Explanation:

You can develop user-specific applications that reside on your network entity and have the ability to subscribe for event services supported by the IMG. If the network entity wants the ability to detect an entered DTMF digit (only telephone event of “###” are currently supported) from the TDM-side of a call to the IP side of a call, the entity can subscribe to the IMG for these events and receive SIP NOTIFY events containing the digit event.

 

 

QUESTION 27

Which H.245 information is exchanged within H.225 messages in H.323 Fast Connect?

 

A.


Terminal Capability Set

B.

Open Logical Channel

C.

Master-Slave Determination

D.

Call Setup

E.

Call Progress

 

Correct Answer: B

Explanation:

With the standard H.245 negotiation, the two endpoints need three round-trips before they agree on the parameters of the audio/video channels (1. master/slave voting, 2. terminal capability set exchange, and finally, 3. opening the logical channels). In certain situations and especially with high-latency network links, this can last too long and users will notice the delay.

 

 

 

QUESTION 28

Which two SCCP call signaling messages are sent by an IP phone to Cisco Unif
ied Communications Manager? (Choose two.)

 

A.

SoftKeyEvent

B.

OpenReceiveChannelAck

C.

StartMediaTransmission

D.

SelectSoftKeys

E.

CloseReceiveChannel

F.

StopTone

 

C
orrect Answer:
AB

Explanation:

This message indicates which soft key was pressed. Upon receipt of this message, CallManager invokes the action associated with the pressed soft key. For example, if Hold was the pressed soft key, CallManager places the active call on user hold. In some trace files you might see a soft key number without the corresponding description. The following list defines each soft key number.

 

 

QUESTION 29

Refer to the exhibit. If this SIP call is initiated using delayed offer, which SIP message will UA#2 use to communicate its media capability to UA#1?

 

clip_image005[1]

 

A.

INVITE

B.

180 Ringing

C.

200 OK

D.

ACK

E.

RTP Media

 

Correct Answer: C

Explanation:

200 OK Indicates the request was successful.

 

QUESTION 30

Refer to the exhibit. You received this debug output to troubleshoot a Cisco IOS MGCP gateway call quality issue at a customer site. Which statement about this message is true?

 

clip_image008

 

A.

The MGCP gateway is responding to an RQNT message from Cisco Unified Communications Manager to poll the call statistics of an active call.

B.

The MGCP gateway is responding to an AUEP message from Cisco Unified Communications Manager to poll the call statistics of a terminating call.

C.

The MGCP gateway is responding to an MDCX message from Cisco Unified Communications Manager during a call setup.

D.

The MGCP gateway is responding to an AUCX message from Cisco Unified Communications Manager about an active call.

E.

The MGCP gateway is responding to a DLCX message from Cisco Unified Communications Manager about a terminating call.

 

Correct Answer: E

Explanation:

DeleteConnection — used by a call agent to instruct a gateway to delete an existing connection. DeleteConnection can also be used by a gateway to release a connection that can no longer be sustained.

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