[Free] 2017(Apr) Ensurepass Passguide Cisco 400-051 Latest Dumps 31-40

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CCIE Collaboration Written Exam

QUESTION 31

Which statement about G.722.1 codec support on Cisco Unified Communications Manager is true?

 

A.

It is always preferred by Cisco Unified Communications Manager over G.711.

B.

It is a high-complexity wideband codec.

C.

It operates at bit rates of 15.2 and 13.3 kb/s.

D.

It is supported for SIP and SCCP devices.

E.

It is supported for SIP and H.323 devices.

 

Correct Answer: E

Explanation:

G.722.1 is a low-complexity wideband codec operating at 24 and 32 kb/s. The audio quality approaches that of G.722 while using at most half the bit rate. As it is optimized for both speech and music, G.722.1 has slightly lower speech quality than the speech-optimized iSAC codec. G.722.1 is supported for SIP and H.323 devices.

 

 

QUESTION 32

Which ITU-T recommendation defines the procedures for using more than one video channel in H.320-based systems?

 

A.

H.324

B.

H.230

C.

H.239

D.

H.264

E.

H.329

 

Correct Answer: C

Explanation:

H.239 is the ITU standard for a second video channel; this is supported by all the major vendors, and is the only content channel standard supported by Cisco acquired Codian products or Cisco TelePresence Serial Gateway Series products on H.323 video calls. Cisco acquired Codian products need to be configured to enable H.239. Any H.323 endpoint that also supports the H.239 protocol can source this channel, as can a VNC connection, though some endpoints need to be configured to use H.239 instead of their proprietary solution.

 

 

QUESTION 33

To which SIP response category does 301 Moved Permanently belong?

 

A.

Provisional

B.

Successful

C.

Redirection

D.

Client Failure

E.

Server Failure

 

Correct Answer: C

Explanation:

The 301 response from the Web server should always include an alternative URL to which redirection should occur. If it does, a Web browser will immediately retry the alternative URL. So you never actually see a 301 error in a Web browser, unless perhaps you have a corrupt redirection chain e.g. URL A redirects to URL B which in turn redirects back to URL A. If your client is not a Web browser, it should behave in the same way as a Web browser i.e. immediately retry the alternative URL.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 34

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

 

clip_image002

 

A.

The MGCP gateway uses this message to respond to an RQNT message from Cisco Unified Communications Manager.

B.

The MGCP gateway uses this message to respond to an AUCX message from Cisco Unified Communications Manager.

C.

The MGCP gateway uses this message to respond to an AUEP message from Cisco Unified Communications Manager.

D.

The MGCP gateway uses this message to respond to a DLCX message from Cisco Unified Communications Manager.

E.

The MGCP gateway uses this message to respond to an NTFY message from Cisco Unified Communications Manager.

 

Correct Answer: C

Explanation:

This message requests the status of an endpoint. Information that can be audited with this includes Requested Events, DigitMap, SignalRequests, RequestIdentifier, QuarantineHandling, Notified Entity, Connection Identifiers, Detect Events, Observed Events, Event States, Bearer Information, Restart Method, Restart Delay, ReasonCode, PackageList, Max MGCP Datagram, and Capabilities. The response will include information about each of the items for which auditing info was requested.

 

 

QUESTION 35

Which two SDP content headers can be found in a SIP INVITE message? (Choose two.)

 

A.

Expires

B.

Contact

C.

Connection Info

D.

Media Attributes

E.

Allow

F.

CSeq

 

Correct Answer: CD

Explanation:

Connection info is optional field in SDP whether Media attributes decide the codec and media type for that call.

 

 

QUESTION 36

Refer to the exhibit. Which user agent has the recipient role in this SIP REFER call transfer?

 

clip_image004

 

A.

user agent A

B.

user agent B

C.

user agent C

D.

user agent B and C

E.

user agent A and B

 

Correct Answer: B

Explanation:

The Refer method has three main roles:

 

Originator–User agent that initiates the transfer or Refer request.

Recipient–User agent that receives the Refer request and is transferred to the final-recipient.

Final-Recipient–User agent introduced into a call with the recipient.

 

Reference:

http://www.cisco.com/c/en/us/td/docs/ios_xr_sw/iosxr_r3-4/sbc/configuration/guide/sbc_c34/sbc34stx.pdf

 

 

 

 

QUESTION 37

Which statement about the iSAC on Cisco Unified Border Element is true?

 

A.

It is a narrow-band codec.

B.

It has a fixed frame of 30 milliseconds.

C.

It has an adaptive frame of up to 60 milliseconds.

D.

It is designed to deliver wideband sound quality in high-bit-rate applications only.

E.

It is not yet supported on the Cisco Unified Border Element (CUBE)

F.

It is not yet supported on Cisco Unified Border Element.

 

Correct Answer: C

Explanation:

iSAC-Internet Speech Audio Codec (iSAC) is an adaptive wideband audio codec, specially designed to deliver wideband sound quality with low delay in both low and medium-bit rate applications. Using an adaptive bit rate of between 10 and 32 kb/s, iSAC provides audio quality approaching that of G.722 while using less than half the bandwidth. In deployments with significant packet loss, delay, or jitter, such as over a WAN, iSAC audio quality is superior to that of G.722 due to its robustness. iSAC is supported for SIP and SCCP devices. The Cisco Unified Communications Manager IP Voice Media Streaming App (IPVMSApp), which includes Media Termination Point, Conference Bridge, Music on Hold Server, and Annunciator does not support iSAC. MGCP devices are not supported.

 

 

QUESTION 38

Which two types of devices on Cisco Unified Communications Manager support iSAC? (Choose two.)

 

A.

MGCP

B.

SIP

C.

SCCP

D.

Music on Hold server

E.

H.323

 

Correct Answer: BC

Explanation:

iSAC-Internet Speech Audio Codec (iSAC) is an adaptive wideband audio codec, specially designed to deliver wideband sound quality with low delay in both low and medium-bit rate applications. Using an adaptive bit rate of between 10 and 32 kb/s, iSAC provides audio quality approaching that of G.722 while using less than half the bandwidth. In deployments with significant packet loss, delay, or jitter, such as over a WAN, iSAC audio quality is superior to that of G.722 due to its robustness. iSAC is supported for SIP and SCCP devices. The Cisco Unified Communications Manager IP Voice Media Streaming App (IPVMSApp), which includes Media Termination Point, Conference Bridge, Music on Hold Server, and Annunciator does not support iSAC. MGCP devices are not supported.

 

 

 

 

 

 

 

 

 

 

QUESTION 39

Refer to the exhibit. How many SIP signaling dialog(s) took place in this SIP message exchange between two SIP user agents?

 

clip_image005

 

A.

1

B.

2

C.

3

D.

4

E.

5

F.

6

 

Correct Answer: A

Explanation:

During the establishment, maintenance and termination of a SIP session, signaling messages are exchanged between the two SIP endpoints. There are two different kinds of signaling “conversations” that those messages take part in: transactions and dialogs.

A transaction is a SIP message exchange between two user-agents that starts with a request and ends with its final response (it can also contain zero or more provisional responses in between). For example, during the termination of a SIP session, one user releases the call by sending a BYE request and the other party replies back with a 200 OK response. This message exchange is called a transaction. But what happens in the case of the INVITE request? The establishment of a SIP session starts basically with an INVITE request and is considered as completed upon the receipt of the ACK. In this case, the transaction starts with the INVITE request and ends with the 200 OK, so the ACK is not part of the transaction. The ACK can be considered as a transaction on its own. However, when the final response to an INVITE is not a 2xx response, then the ACK is considered as part of the transaction. A dialog is a complete exchange of SIP messages between two user-agents. That means that transactions are actually parts of a dialog. For example, in the case of a SIP session establishment, a dialog starts with the INVITE-200 OK transaction, continues with the ACK and ends with the BYE-200 OK transaction.

The picture below depicts the dialog and transactions that take place during the establishment of a SIP session:

 

clip_image006

 

Note:

There can also be subsequent requests that belong to the same dialog, such as a BYE or a re-INVITE message. As out-of-dialog requests are considered messages such as an initial INVITE request for a new session or an OPTIONS message for checking capabilities.

There are different SIP headers/parameters that identify the dialogs and transactions, and they will be analyzed in later posts.

 

Reference:

https://telconotes.wordpress.com/2013/03/13/sip-transactions-vs-dialogs/

 

 

QUESTION 40

Which procedure uses H.225 messages to exchange H.245 Master-Salve Determination information?

 

A.

H.323 Fast Connect

B.

H.245 tunneling

C.

H.225 tunneling

D.

H.323 early media

E.

H.245 terminal capability set

 

Correct Answer: B

Explanation:

The H.245 protocol is a media control protocol that is a part of H.323 protocol suite. The H.245 protocol is used primarily to negotiate master-slave relationship between communicating endpoints. These endpoints exchange terminal capabilities and logical channel manipulations (open, close, modify).The H.245 messages can be encapsulated and carried between H.225 controlled endpoints within H.225 messages. This way of “piggy-backing” an H.245 message to H.225 message is referred to as H245 Tunneling. The H.245 Tunneling method is optional and negotiable between communicating H.323 endpoints. If both endpoints support this option, usually the H.245 Media Controlled messages are exchanged via the Tunneling method.

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