Cisco 642-457 Online Practice Questions and Exam Preparation

Cisco 642-457 Online Questions & Answers

• Question 1:

  Refer to the exhibit.

  

  Which statement about the configuration between the Default and BR regions is true?

  A. Calls between the two regions can use either 64 kbps or 8 kbps.
  B. Calls between the two regions can use only the G.729 codec.
  C. Only 64 kbps will be used between the two regions because the link is "lossy".
  D. Both codecs can be used depending on the loss statistics of the link. When lossy conditions are high, the G.711 codec will be used.
  B. Calls between the two regions can use only the G.729 codec.

• Question 2:

  Which two configurations provide the best SIP trunk redundancy with Cisco Unified Communications Manager? (Choose two.)

  A. Configure all SIP trunks with DNS SRV
  B. Configure all SIP trunks with Cisco Unified Border Element
  C. Configure all SIP trunks to point to a SIP gateway
  D. Configure SIP trunks to be members of route groups and route lists
  E. Configure all SIP trunks to allow TCP ports 5060
  F. Configure all SIP trunks to point to a gatekeeper through SIP to H.323 gateway
  A. Configure all SIP trunks with DNS SRV
  D. Configure SIP trunks to be members of route groups and route lists

• Question 3:

  When device mobility mode is enabled or disabled for a cluster, to which does the cluster setting apply?

  A. all phones in the cluster that support device mobility
  B. all phones in the cluster that subscribed to device mobility
  C. mobile phones in the cluster that support device mobility
  D. mobile phones in the cluster that are in default mode
  A. all phones in the cluster that support device mobility

• Question 4:

  You are deploying a remote office setup that connects with Cisco Unity Communications Manager at a hub location. You have an available dedicated bandwidth of 20% from the 2-Mb/s WAN circuit for VoIP that supports a maximum of 17 calls. Which codec do you configure in Cisco Unity Communications Manager to achieve this?

  A. G.722
  B. G.711
  C. G.729
  D. iSAC
  E. GSM-FR
  F. iLBC
  C. G.729

• Question 5:

  Which two features require or may require configuring a SIP trunk? (Choose two.)

  A. SIP gateway
  B. Call Control Discovery between a Cisco Unified Communications Manager and Cisco Unified Communications Manager Express
  C. Cisco Device Mobility
  D. Cisco Unified Mobility
  E. registering a SIP phone
  A. SIP gateway
  B. Call Control Discovery between a Cisco Unified Communications Manager and Cisco Unified Communications Manager Express

• Question 6:

  Which two have to be defined in the Forward All field? (Choose two.) (SourcE. Preventing Toll Fraud)

  A. calling search space
  B. destination
  C. partition
  D. hunt list
  A. calling search space
  B. destination

• Question 7:

  Which command displays the detailed configuration of all the Cisco Unified IP phones, voice ports, and dial peers of the Cisco Unified SRST router?

  A. show call-manager-fallback all
  B. show dial-peer voice summary
  C. show ephone summary
  D. show voice port summary
  A. show call-manager-fallback all

• Question 8:

  Which configuration command disables the secondary dial tone on the branch office ISR for users calling from the PSTN into the branch office during a WAN failure?

  A. direct-inward-dial
  B. voice translation-rule
  C. incoming called-number
  D. application
  A. direct-inward-dial

• Question 9:

  A voice-mail product that supports only the G.711 codec is installed in headquarters.

  Which action allows branch Cisco IP phones to function with voice mail while using only the 729 codec over the WAN link to headquarters?

  A. Configure Cisco Unified Communications Manager regions.
  B. Configure transcoding within Cisco Unified Communications Manager.
  C. Configure transcoding resources in Cisco IOS and assign to the MRGL of Cisco IP phones.
  D. Configure transcoder resources in the branch Cisco IP phones.
  C. Configure transcoding resources in Cisco IOS and assign to the MRGL of Cisco IP phones.

• Question 10:

  Which two statements about remote survivability are true? (Choose two.)

  A. SRST supports more Cisco IP Phones than Cisco Unified Communications Manager Express in SRST mode.
  B. Cisco Unified Communications Manager Express in SRST mode supports more Cisco IP Phones than SRST.
  C. MGCP fallback is required for ISDN call preservation.
  D. MGCP fallback functions with SRST.
  A. SRST supports more Cisco IP Phones than Cisco Unified Communications Manager Express in SRST mode.
  D. MGCP fallback functions with SRST.