Cisco 400-051 Online Practice Questions and Exam Preparation

Cisco 400-051 Online Questions & Answers

• Question 381:

  Which SIP request method enables reliability of SIP 1xx response types?

  A. ACK
  B. PRACK
  C. OPTIONS
  D. CANCEL
  E. REGISTER
  B. PRACK

  ---

  In order to achieve reliability for provisional responses, we do nearly the same thing. Reliable provisional responses are retransmitted by the TU with an exponentialbackoff. Those retransmissions cease when a PRACK message is received. The PRACK request plays the same role as ACK, but for provisional responses. There is an important difference, however. PRACK is a normal SIP message, like BYE. As such, its own

• Question 382:

  Which two actions does the Cisco Unified IP phone use the initial Trust list to perform? (Choose two.)

  A. Decrypt secure XML files
  B. Encrypt RTP traffic for ip phones that are not registered to the same call manager cluster
  C. Download background image files
  D. Authenticate their configuration file signature
  E. Talk securely to CAPF which is a prerequisite to support configuration files encryption
  D. Authenticate their configuration file signature
  E. Talk securely to CAPF which is a prerequisite to support configuration files encryption

• Question 383:

  Refer to the exhibit.

  

  Assume the B-ACD configuration on a Cisco Unified Communications Manager Express router is operational.

  Which option describes what will happen to an incoming call that entered the call queue but all members of the hunt group are in Do Not Disturb status?

  A. The call is forwarded to extension 2120.
  B. The call is forwarded to extension 2220.
  C. The call is forwarded to extension 2003.
  D. The call is disconnected with user busy.
  E. The call is forwarded to extension 2100.
  B. The call is forwarded to extension 2220.

  ---

  Because all members of hunt group are unavailable or activate DnD and incoming queued call will forward to voicemail using the param voice-mail 2220 command. References: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/bacd/configuration/guide/cme40tcl/40bacd.html#wpmkr1105714

• Question 384:

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

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

• Question 385:

  Which statement describes the Cisco best practice recommendation about priority queue bandwidth allocation in relationship to the total link bandwidth when multiple strict priority LLQs are configured on the same router interface?

  A. Each LLQ should be limited to one-third of the link bandwidth capacity.
  B. The sum of all LLQs should be limited to two-thirds of the link bandwidth capacity.
  C. The sum of all LLQs should be limited to one-half of the link bandwidth capacity.
  D. The sum of all LLQs should be limited to one-third of the link bandwidth capacity.
  E. Cisco does not recommend more than one strict priority LLQ per interface.
  D. The sum of all LLQs should be limited to one-third of the link bandwidth capacity.

  ---

  Cisco Technical Marketing testing has shown a significant decrease in data application response times when Real-Time traffic exceeds one-third of a link's bandwidth capacity. Cisco IOS Software allows the abstraction (and, thus, configuration) of multiple LLQs. Extensive testing and production-network customer deployments have shown that limiting the sum of all LLQs to 33 percent is a conservative and safe design ratio for merging real-time applications with data applications.

• Question 386:

  

  Refer to the exhibit. Which SIP Rack header value is in a PRACK message that is sent in response to this 183 Session Progress message?

  A. No Rack header is included
  B. 200
  C. 3235
  D. 102
  E. 3234
  C. 3235

• Question 387:

  What does a period accomplish when it is used in a SIP Dial Rule pattern that is associated with a Cisco 9971 IP Phone that is registered to Cisco Unified Communications Manager?

  A. It matches any single digit from 0 to 9.
  B. It matches one or more digits from 0 to 9.
  C. It is a delimiter and has no significant dialing impact.
  D. It matches any single digit from 0 to 9, or the asterisk (*) or pound (#) symbols.
  E. It matches one or more digits from 0 to 9, or the asterisk (*) or pound (#) symbols.
  D. It matches any single digit from 0 to 9, or the asterisk (*) or pound (#) symbols.

  ---

  Asterisk (*) matches one or more characters. The * gets processed as a wildcard character. You can override this by preceding the * with a backward slash (\) escape sequence, which results in the sequence \*. The phone automatically strips the \, so it does not appear in the outgoing dial string. When * is received as a dial digit, it gets matched by the wildcard characters * and period (.).

• Question 388:

  Which two enterprise presence domains can federate with Cisco IM and Presence by using SIP? (Choose two.)

  A. AOL
  B. Microsoft OCS
  C. IBM Sametime
  D. Cisco WebEx Connect
  E. Google Talk
  F. Cisco Unified Presence 8.X Releases
  A. AOL
  B. Microsoft OCS

  ---

  Microsoft Lync and OCS support presence services with sip as well as AOL so to sip is easy to troubleshoot and feasible for signaling that's why cisco federate these with sip.

• Question 389:

  Refer to the exhibit.

  

  Which option describes the method used by Cisco IOS gateways to tunnel QSIG signaling messages in H.323 protocol?

  A. H.323 Annex M1
  B. H.323 Annex M2
  C. H.323 Annex A
  D. ISDN Generic Transparency Descriptor
  E. H.450.1
  D. ISDN Generic Transparency Descriptor

  ---

  H.323 is an umbrella recommendation that encompasses various ITU-T recommendations, primarily recommendations H.225.0 and H.245 (basic communication capabilities) and recommendation H.450.1 (generic functional protocol for the support of supplementary services). Tunneling QSIG over H.323 is specified in H.323 Annex-M1. However, Cisco IOS ?Software H.323 QSIG tunneling does not implement Annex-M1 (as the Cisco Unified Communications Manager H.323 implementation does). Instead it uses the ISDN Generic Transparency Descriptor (GTD) to transport QSIG messages in the corresponding H.225 message to another Cisco gateway device on the other side of the network.

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

• Question 390:

  

  Refer to the exhibit. Which statement described the event captured in the SIP message between a Cisco Unified Communication Manager Express (CUCME) and a Unity express (CUE)?

  A. An SIP IP phone initiated this SIP Message to the CUE for MWI to request for MWI information.
  B. The CUCME initiated this SIP message, in response to an earlier solicitation from CUE for MWI information.
  C. An SIP IP phone initiated this message to the CUCME to request for MWI information.
  D. The CUCME initiated this SIP message to CUE for message notification.
  E. The CUCME forwarded this sip message, originated from an registered SIP IP phone , to the CUE to request for MWI information.
  A. An SIP IP phone initiated this SIP Message to the CUE for MWI to request for MWI information.