Cisco 400-051 Online Practice Questions and Exam Preparation

Cisco 400-051 Online Questions & Answers

• Question 481:

  Which SIP reason phrase maps to SIP response reason code 181?

  A. Ringing
  B. Call is Being Forwarded
  C. Session in Progress
  D. Unknown Number
  E. Call Does not Exist
  B. Call is Being Forwarded

  ---

  1xx--Provisional Responses 100 Trying Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. 180 Ringing Destination user agent received INVITE, and is alerting user of call. 181 Call is Being Forwarded Servers can optionally send this response to indicate a call is being forwarded.[1]:?1.1.3 182 Queued Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available. A server may send multiple 182 responses to update progress of the queue. 183 Session in Progress This response may be used to send extra information for a call which is still being set up. 199 Early Dialog Terminated Can be used by User Agent Server to indicate to upstream SIP entities (including the User Agent Client (UAC)) that an early dialog has been terminated.

  Reference: http://en.wikipedia.org/wiki/List_of_SIP_response_codes

• Question 482:

  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
  A. MPEG-4 Part 10
  D. AVC

  ---

  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 483:

  Refer to the exhibit. Which two of the following are possible causes of the error message when an agent attempted to log into the Cisco Agent Desktop? (Choose two.)

  

  A. The IPCC extension is not associated with the end user.
  B. The resource is not available under Cisco Desktop Administrator.
  C. The MAC of the agent phone is not associated with RMCM application user on the Cisco Unified Communications Manager.
  D. The RMCM subsystem is stuck in the initializing state.
  E. The incorrect extension was entered by the agent while logging onto Cisco Agent Desktop.
  C. The MAC of the agent phone is not associated with RMCM application user on the Cisco Unified Communications Manager.
  D. The RMCM subsystem is stuck in the initializing state.

• Question 484:

  Refer to the exhibit.

  

  How many SIP signaling transaction(s) took place in this SIP message exchange between two SIP user agents?

  A. 1
  B. 2
  C. 3
  D. 4
  E. 5
  F. 6
  C. 3

  ---

  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:

  

  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.

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

• Question 485:

  

  Refer to the exhibit. Which type of SIP message does Cisco Unity Express use to respond to this incoming SIP message when it is configured for unsolicited MWI notification?

  A. 5XX
  B. 4XX
  C. 2XX
  D. 3XX
  E. 1XX
  D. 3XX

• Question 486:

  Refer to the exhibit.

  

  A Cisco Unified CME administrator is configuring SNR for a line and has these requirements:

  -The remote phone should receive the call after the local phones ring for 10 seconds. -The ANI displayed on the remote phones should be the local extension number. Which two configuration commands complete these requirements? (Choose two.)

  A. snr 92875421 delay 15 timeout 10
  B. snr 92875421 delay 10 timeout 20
  C. snr calling-number local
  D. snr calling-number remote
  E. snr answer-too-soon 10
  B. snr 92875421 delay 10 timeout 20
  C. snr calling-number local

• Question 487:

  

  Refer to the exhibit. Which Cisco Unified Boarder Element SIP Profile rules will modify the inbound SIP INVITE into outbound SIP INVITE?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  E. Option E
  E. Option E

• Question 488:

  Which three softkeys can be offered on a Cisco IP Phone 7965, running SCCP firmware, when it is in On Hold state? (Choose three.)

  A. Select
  B. Confrn
  C. NewCall
  D. EndCall
  E. iDivert
  F. Park
  G. Hold
  A. Select
  C. NewCall
  E. iDivert

• Question 489:

  An engineer is converting all gateways to SIP and wants to ensure that the device is protected from traffic with malicious intent. Which two parameters must the engineer enable to protect the Cisco Unified Communications Manager from SIP Denial of Service (DoS) attacks on any newly created SIP trunks? (Choose two.)

  A. SIP Station TCP Port Throttle Threshold
  B. SIP Max Incoming Message Headers
  C. SIP Max Incoming Message Size
  D. SIP TCP Unused Connection Timer
  E. Denial-of-Service Protection Flag
  F. SIP Trunk TCP Port Throttle Threshold
  E. Denial-of-Service Protection Flag
  F. SIP Trunk TCP Port Throttle Threshold

• Question 490:

  Which two Sip requests use the same Cseq number of an earlier INVITE request? (Choose two.)

  A. BYE
  B. NOTIFY
  C. ACK
  D. REFER
  E. CANCEL
  F. UPDATE
  D. REFER
  E. CANCEL