Cisco 400-051 Online Practice Questions and Exam Preparation

Cisco 400-051 Online Questions & Answers

• Question 301:

  Which MGCP message does a Cisco IOS MGCP gateway send to the backup Cisco Unified CM server when two consecutive keep-alive exchanges failed with the primary Cisco Unified CM server?

  A. AUEP
  B. DLCX
  C. NTFY
  D. RSIP
  E. AUCX
  D. RSIP

• Question 302:

  Refer to the exhibit.

  

  Which two wireless security modes offer these configuration options on a Cisco 9971 IP Phone? (Choose two)

  A. Shared Key
  B. AKM
  C. EAP-FAST
  D. Open
  E. LEAP
  F. Open with WEP
  A. Shared Key
  F. Open with WEP

• Question 303:

  What is the maximum number of option 66 IP addresses that a Cisco IP SCCP phone will accept and use from a DHCP server?

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

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  References: http://www.techtronicssolution.com/blog/?p=1201

• Question 304:

  An engineer wants to configure a Cisco IOS router to allow for up to four simultaneous conferences in CME mode. Which configuration meets the requirement?

  A. dspfram profile 1 conferenceCodec G711ulawMaximum sessions 4Maximum conference-participants 8Telephony-serviceSdspfarm units 4Sdspfarm tag 4 hwcfbConference hardware
  B. dspfram profile 1 conferenceCodec G711ulawMaximum conference-participants 8Telephony-serviceSdspfarm units 4Sdspfarm tag 4 hwcfbConference hardwareMax-conference-participants 8
  C. dspfram profile 1 conferenceCodec G711ulawMaximum sessions 4Maximum conference-participants 8Telephony-serviceSdspfarm units 1Sdspfarm tag 1 hwcfbConference hardwareMax-conferences 2
  D. dspfram profile 1 conferenceCodec G711ulawMaximum sessions 4Maximum conference-participants 8Telephony-serviceSdspfarm units 1Sdspfarm tag 1 hwcfbConference hardwareMax-conferences 4
  D. dspfram profile 1 conferenceCodec G711ulawMaximum sessions 4Maximum conference-participants 8Telephony-serviceSdspfarm units 1Sdspfarm tag 1 hwcfbConference hardwareMax-conferences 4

• Question 305:

  Which statement describes a disadvantage of using the Cisco TFTP service to serve IP phone load files?

  A. The Cisco TFTP services can run on only one Cisco Unified Communications Manager server in a cluster.
  B. Because TFTP operates on top of UDP, there is a high risk of corrupted load file delivery at the completion of the TFTP process due to undetected data loss in the network.
  C. If a response is not received in the timeout period, the TFTP server will not resend the data packet.
  D. Packet loss can significantly increase the TFTP session completion time.
  E. Because TFTP operates with an adaptive timeout period, the time to complete the file transfer is unpredictable.
  D. Packet loss can significantly increase the TFTP session completion time.

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  Voice traffic cannot recapture lost packets. Rather than retransmitting a lost network connection, the phone resets and attempts to reconnect its network connection.

  References: http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/6921_6941_6961/7_1_2/english/admin/guide/6921trb.html#wp1031181

• Question 306:

  

  Refer to the exhibit. Which two conditions place the Self-Provisioning status to Ready state? (Choose two.)

  A. Self-provisioning IVR Service is started
  B. At least one User Profile is configured
  C. Self-Provisioning is enabled in Enterprise Parameters
  D. Auto-Registration is enabled
  E. At least one end-user is configured for Self-Provisioning
  F. Authentication Mode is set to "No Authentication Required"
  G. Self-Provisioning is enabled in Service Parameters
  A. Self-provisioning IVR Service is started
  D. Auto-Registration is enabled

• Question 307:

  Which two data frame lengths are supported by iLBC? (Choose two.)

  A. 10 milliseconds
  B. 20 milliseconds
  C. 30 milliseconds
  D. 40 milliseconds
  E. 50 milliseconds
  F. 60 milliseconds
  B. 20 milliseconds
  C. 30 milliseconds

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  iLBC-Internet Low Bit Rate Codec (iLBC) provides audio quality between that of G.711 and G.729 at bit rates of 15.2 and 13.3 kb/s, while allowing for graceful speech quality degradation in a lossy network due to the speech frames being encoded independently. By comparison, G.729 does not handle packet loss, delay, and jitter well, due to the dependence between speech frames. iLBC is supported for SIP, SCCP, H323, and MGCP devices.

• Question 308:

  To which SIP response class do the SIP response codes 300 to 399 belong?

  A. Provisional
  B. Client Failure
  C. Server Failure
  D. Successful
  E. Redirection
  E. Redirection

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  Redirection -- further action needs to be taken in order to complete the request. That is what this class implies.

• Question 309:

  Which two SCCP call states support the MeetMe softkey? (Choose two.)

  A. On Hook
  B. Connected
  C. On Hold
  D. Off Hook
  E. Ring Out
  F. Connected Conference
  A. On Hook
  D. Off Hook

• Question 310:

  Which statement about application inspection of SAF network services on an adaptive security appliance is true?

  A. The adaptive security appliance can inspect and learn the ephemeral port numbers that are used by H.225 and H.245 on SAF-enabled H.323 trunks.
  B. An explicit ACL must be configured on the adaptive security appliance for SAF-enabled SIP trunks.
  C. An explicit ACL must be configured on the adaptive security appliance for SAF-enabled H.323 trunks to account for ephemeral port numbers that are used by H.225 and H.245.
  D. The adaptive security appliance can inspect and learn the ephemeral port numbers that are used by H.225 on SAF-enabled H.323 trunks, but H.245 ports must be explicitly defined.
  E. The adaptive security appliance provides full application inspection for SAF network services.
  C. An explicit ACL must be configured on the adaptive security appliance for SAF-enabled H.323 trunks to account for ephemeral port numbers that are used by H.225 and H.245.

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  The Adaptive Security Appliances do not have application inspection for the SAF network service. When Unified CM uses a SAF-enabled H.323 trunk to place a call, the ASA cannot inspect the SAF packet to learn the ephemeral port number used in the H.225 signaling. Therefore, in scenarios where call traffic from SAF-enabled H.323 trunks traverses the ASAs, ACLs must be configured on the ASAs to allow this signaling traffic. The ACL configuration must account for all the ports used by the H.225 and H.245 signaling.

  References: Cisco Collaboration 9.x Solution Reference Network Designs (SRND) page 4-34