Cisco 400-051 Online Practice Questions and Exam Preparation

Cisco 400-051 Online Questions & Answers

• Question 241:

  Which option is the default Cisco Wireless Unified Communications endpoints marking for video media traffic or video RTP traffic?

  A. DSCP 8
  B. DSCP 24
  C. DSCP 34
  D. DSCP 46
  C. DSCP 34

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  When configuring network-level quality of service (QoS), Cisco video endpoints (including Cisco Unified IP Phone 8900 and 9900 Series and Cisco TelePresence System EX Series devices) generally mark traffic at Layer 3 according to Cisco general QoS guidelines related to voice and video packet marking (video media as DSCP 34 or PHB AF41; call signaling as DSCP 24 or PHB CS3) and therefore these devices can be trusted.

• Question 242:

  Which computing model does Fog use?

  A. cluster
  B. centralized
  C. distributed
  D. grid
  C. distributed

• Question 243:

  An engineer notices that two Cisco utility Connection servers in a cluster are in split-brain mode. The engineer corrects a network issue that allows the two servers to communicate again. Which two statements describe negative effects of this event? (Choose two)

  A. A user calling in to check their voicemail during the recovery may be informed that their messages are not available.
  B. Message waiting lights van become out of sync after the split-brain recovery. Forcing the administrator to run an MWI Synchronization.
  C. The replication between the nodes becomes defunct, requiring the administrator to run utils cuc cluster activate to re-establish intracluster.
  D. A message left on the subscriber server during the outage may be lost during the cluster recovery.
  E. The replication between the nodes becomes defunct, requiring the administrator to run utils cuc cluster renegotiate to re-establish intracluster communication.
  F. The Unity Connection Database can become corrupted, causing the need to reinstall the subscriber server.
  A. A user calling in to check their voicemail during the recovery may be informed that their messages are not available.
  C. The replication between the nodes becomes defunct, requiring the administrator to run utils cuc cluster activate to re-establish intracluster.

• Question 244:

  Which two Cisco IOS multipoint video conferencing profiles are supported on the Cisco Integrated Router Generation 2 with packet voice and video digital signal processor 3? (Choose two.)

  A. homogeneous
  B. rendezvous
  C. guaranteed-audio
  D. scheduled
  E. guaranteed-video F. ad-hoc
  A. homogeneous
  C. guaranteed-audio

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  Q. What video conferences are supported?

  A. Three types of video profiles are supported: homogeneous conferences (video switching), heterogeneous conferences (video mixing), and guaranteed audio conferences (best-effort video).

  References: http://www.cisco.com/c/en/us/products/collateral/unified-communications/voice-video-conferencing-isr-routers/qa_c67-649850.html

• Question 245:

  What is the amount of audio bandwidth, in kilobits per second, that is used in the Cisco Unified Communications Manager location bandwidth calculation for a G.728 call?

  A. 8
  B. 16
  C. 24
  D. 29
  E. 80
  B. 16

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  G.728--Low-bit-rate codec that video endpoints support.It support kilobits per second

• Question 246:

  Refer to the exhibit.

  

  The public key infrastructure debugs are generated on a Cisco IOS VPN router for a failed certification validation on an incoming connection from an IP phone client. Which option is a possible solution for this problem?

  A. Define a matching Certification Revocation List on the Cisco IOS VPN router.
  B. Define a Certification Revocation List in the IP phone certificate.
  C. Disable revocation check for the trustpoint.
  D. Define an enrollment URL for the trustpoint.
  E. Define a matching Certification Revocation List on the Cisco Unified Communications Manager.
  C. Disable revocation check for the trustpoint.

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  When a certificate is issued, it is valid for a fixed period of time. Sometimes a CA revokes a certificate before this time period expires; for example, due to security concerns or a change of name or association. CAs periodically issues a signed list of revoked certificates. Enabling revocation checking forces the IOS router to check that the CA has not revoked a certificate every time it uses that certificate for authentication. When you enable revocation checking during the PKI certificate validation process, the router checks certificate revocation status. It can use either CRL checking or Online Certificate Status Protocol or both, with the second method you set in effect only when the first method returns an error, for example, that the server is unavailable. With CRL checking, the router retrieves, parses, and caches Certificate Revocation Lists, which provide a complete list of revoked certificates. OCSP offers a more scalable method of checking revocation status in that it localizes certificate status on a Validation Authority, which it queries for the status of a specific certificate.

• Question 247:

  Which two security services are provided by the Phone Proxy function on a Cisco ASA appliance? (Choose two.)

  A. It provides interworking to ensure that external IP phone traffic is encrypted, as long as the Cisco Unified Communications Manager cluster runs in secure mode.
  B. It only applies to encrypted voice calls where both parties utilize encryption.
  C. It manipulates the call signaling to ensure that all media is routed via the adaptive security appliance.
  D. It supports encrypted TFTP operation of IP phone configuration files.
  E. It intercepts and authenticates soft clients before they reach Cisco Unified Communications Manager clusters.
  F. It requires a remote routing device with an IPsec VPN tunnel.
  C. It manipulates the call signaling to ensure that all media is routed via the adaptive security appliance.
  E. It intercepts and authenticates soft clients before they reach Cisco Unified Communications Manager clusters.

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  When using TLS Proxy, the Cisco ASA appliance is inserted between the phones and Cisco Unified Communications Manager. The phones will now establish a TLS session with the ASA appliance. The appliance will, in turn, establish a proxy TLS connection with Cisco Unified Communications Manager on the phone's behalf. This function generates two TLS sessions.

• Question 248:

  Refer to the exhibit. Which description of the event captured in the SIP message on a Cisco Unified Communications Manager Express router with Cisco Unity Express and registered IP phones (SIP and SCCP) is true?

  

  A. the Cisco UCM Express router notifies a SIP IP phone to turn on its MWI.
  B. Cisco Unity Express notifies a SIP IP phone to turn on its MWI.
  C. the Cisco UCM Express router hairpins a SIP message to itself to notify an SCCP IP phone to turn on MWI.
  D. the Cisco UCM Express router notifies Cisco Unity Express that MWI has been turned on for a SIP IP phone.
  E. Cisco Unity Express notifies the Cisco UCM Express router to turn on MWI for a SIP IP phone.
  E. Cisco Unity Express notifies the Cisco UCM Express router to turn on MWI for a SIP IP phone.

• Question 249:

  Refer to the exhibit.

  

  Which two statements about the show command output are true? (Choose two.)

  A. T1 0/2/1 terminates Q.921 signaling to a Cisco Unified Communications Manager server.
  B. T1 0/0/0 terminates Q.921 signaling on the gateway.
  C. T1 0/0/0 terminates SIP Signaling to a Cisco Unified Communications Manager server.
  D. T1 0/0/0 terminates Q.931 signaling to a Cisco Unified Communications Manager server.
  E. T1 0/2/1 terminates Q.931 signaling on the gateway.
  B. T1 0/0/0 terminates Q.921 signaling on the gateway.
  D. T1 0/0/0 terminates Q.931 signaling to a Cisco Unified Communications Manager server.

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  As you can see the T1 0/0/0:23 interface is active in layer 1,2(multi frame established) and 3,it means Q.931 signaling terminates at gateway and using backhauled technique q931 messages are going to CUCM server. But in case of T1 0/2/1 port multi frames are not established in layer 2.So, it's not configured properly and doesn't backhauling q931 messages to CUCM

• Question 250:

  How is Video Call Traffic Class defined on Cisco Unified CM for Enhanced Location CAC bandwidth deductions?

  A. On each device's configuration page
  B. On Device Profile page
  C. On SIP Profile configuration page
  D. On Location configuration page
  E. On each device or Device Pool's configuration page
  D. On Location configuration page