[Free] 2017(Apr) Ensurepass Passguide Cisco 400-051 Latest Dumps 51-60

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CCIE Collaboration Written Exam

QUESTION 51

Refer to the exhibit. Which SIP response message should the TGW send if it cannot process the tunneled QSIG messages from the OGW?

 

clip_image001

 

A.

405 Method Not Allowed

B.

406 Not Acceptable

C.

412 Conditional Request Failed

D.

415 Unsupported Media Type

E.

485 Ambiguous

 

Correct Answer: D

Explanation:

Fallback from QSIG Tunneling

In some situations, QSIG tunneling will fail or need to fall back:

Remote party does not support multipart MIME body: In this case, the remote side sends a “415 Media Not Supported” response. Upon receiving this response, OGW will fall back to normal mode and send an INVITE request without any tunneled content. This procedure helps ensure that at least the basic call will work normally.

Remote party does not understand tunneled content: If the remote side does not support the tunneled content, it should drop the tunneled content and continue as a normal call; because all essential parameters are present in the original INVITE, the call can go through without the need for fallback.

 

Reference:

http://www.cisco.com/c/en/us/solutions/collateral/enterprise-networks/empowered-branch-solution/white_paper_c11_459092.html

 

 

QUESTION 52

In a SIP REFER-based call transfer, which SIP message is being used by the recipient to notify the originator that the final recipient was successfully contacted?

 

A.

200 OK

B.

NOTIFY with a message body of 200 OK

C.

202 Accepted

D.

100 Trying

E.

200 BYE

 

Correct Answer: B

Explanation:

The Refer method always begins within the context of an existing call and starts with the originator. The originator sends a Refer request to the recipient (user agent receiving the Refer request) to initiate a triggered Invite request. The triggered Invite request uses the SIP URL contained in the Refer-To header as the destination of the Invite request. The recipient then contacts the resource in the Refer-To header (final-recipient), and returns a SIP 202 (Accepted) response to the originator. The recipient also must notify the originator of the outcome of the Refer transaction–whether the final-recipient was successfully or unsuccessfully contacted. The notification is accomplished using the Notify Method, SIP’s event notification mechanism. A Notify message with a message body of SIP 200 OK indicates a successful transfer, while a body of SIP 503 Service Unavailable indicates an unsuccessful transfer. If the call was successful, a call between the recipient and the final-recipient results.

 

 

QUESTION 53

Which SIP response is considered a final response?

 

A.

183 Session in Progress

B.

199 Early Dialog Terminated

C.

200 OK

D.

180 Ringing

E.

100 Trying

 

Correct Answer: C

Explanation:

200 OK Indicates the request was successful. Whether other options state the request is still in progress or request is initiated.

 

 

QUESTION 54

What is the name of the logical channel proposal that is transmitted from the called entity to the calling entity in H.323 Fast Connect?

 

A.

Forward Logical Channel

B.

Backward Logical Channel

C.

Reverse Logical Channel

D.

Originator Logical Channel

E.

Destination Logical Channel

 

Correct Answer: C

Explanation:

Unlike the OpenLogicalChannel request used by H.323 for video uni-directional logical channels, the request used by H.324 for opening video bi-directional logical channels specifies the temporalSpatialTradeOff Capability in both the forward and reverse directions–in the forwardLogicalChannelParameters.dataTypeandreverseLogicalChannelParameters.dataType components, respectively. The semantics of temporalSpatialTradeOffCapability used in forward LogicalChannelParameters.dataType is described in the previous section. The semantics for its presence in the reverse direction is described in this section.

 

 

QUESTION 55

Which two compression formats for high-definition video have technical content that is identical to H.264? (Choose two.)

 

A.

MPEG-4 Part 10

B.

MPEG-4 Part 14

C.

MPEG-2 Part 7

D.

AVC

E.

VC3

F.

VP8

 

Correct Answer: AD

Explanation:

MPEG-4 Part 10, also known as MPEG-4 AVC (Advanced Video Coding), is actually defined in an identical pair of standards maintained by different organizations, together known as the Joint Video Team (JVT). While MPEG-4 Part 10 is a ISO/IEC standard, it was developed in cooperation with the ITU, an organization heavily involved in broadcast television standards. Since the ITU designation for the standard is H.264, you may see MPEG-4 Part 10 video referred to as either AVC or H.264. Both are valid, and refer to the same standard.

 

 

QUESTION 56

Which RAS message is used between two gatekeepers to resolve an alias address?

 

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A.

GRQ

B.

ARQ

C.

IRQ

D.

LRQ

E.

RRQ

 

Correct Answer: D

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 57

Which element was added to H.225 messages to enable Fast Connect in H.323 version 2?

 

A.

fastStart

B.

fastConnect

C.

H.245 PDU

D.

User-User Information

E.

Connection Information

 

Correct Answer: A

Explanation:

Fast start allows for H323 media connections to be started at the beginning of a call. This is helpful for ringback scenarios, and also reduces the amount of time calls take to establish media. H245 is still negotiated later, but the actual media can be done earlier through H225 messages.

 

 

 

 

 

 

QUESTION 58

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

 

A.

Check to see if the destination address is locally registered.

B.

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

C.

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

D.

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

E.

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

 

Correct Answer: B

Explanation:

Admission Request (ARQ) and Location Request (LRQ) are the two H.225 Registration, Admission, Status (RAS) messages that trigger a gatekeeper to initiate the call routing decision process.

ARQ–Local zone messages that are sent by H.323 endpoints (usually gateways) to the Cisco gatekeeper. Gatekeepers receive ARQs from an endpoint if.

 

 

QUESTION 59

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

 

A.

SoftKeyEvent

B.

CloseReceiveChannelAck

C.

CallState

D.

KeypadButton

E.

OpenReceiveChannel

F.

Offhook

 

Correct Answer: CE

Explanation:

Upon receiving an OpenReceiveChannelmessage, the IP phone selects the UDP port number it wants to use to receive RTP packets and reports this information to call manager.

With the SCCP protocol architecture, the majority of the H.323 processing power resides in an H.323 proxy — the Cisco CallManager. The end stations (IP phones) run the Skinny client, which consumes less processing overhead. The client communicates with CallManager using connection-oriented (TCP/IP-based) communication to establish a call with another H.323-compliant end station. Once Cisco CallManager has established the call, the two H.323 end stations use connectionless (UDP/IP-based) communication for audio transmissions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 60

Refer to the exhibit. You received this debug output to troubleshoot a Cisco IOS MGCP gateway problem at a customer site. Which statement about this endpoint on the Cisco MGCP gateway is true?

 

clip_image003

 

A.

This endpoint is on a T1 Controller 0/1/0.

B.

This endpoint is on an E1 Controller 0/1/0.

C.

This endpoint is on a T1 Controller 0/1/1.

D.

This endpoint is on an E1 Controller 0/1/2.

E.

This endpoint is on an T1 Controller 0/1/2.

 

Correct Answer: A

Explanation:

The s0/Su1/DS1-0 refers to the slot and port information (0/1/0). It is also a DS1 as shown by this output, which means it is a T1 not an E1.

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