Cisco 642-437 Online Practice Questions and Exam Preparation

Cisco 642-437 Online Questions & Answers

• Question 41:

  When troubleshooting poor VoIP call quality, which two tools should you use to measure the overall metrics? (Choose two.)

  A. mean opinion score
  B. quality of service
  C. quality of experience
  D. R-Factor
  E. signal-to-noise ratio
  A. mean opinion score
  D. R-Factor

• Question 42:

  Refer to the exhibit. Which class is always present even though it is not in the configuration snip?

  

  A. class best-effort
  B. class class-default
  C. default class
  D. best-effort class
  E. class class-scavenger
  B. class class-default

  ---

  The class-default is in every policy-map by default and it cannot be removed. The class- default class is used to classify traffic that does not fall into one of the defined classes. Once a packet is classified, all of the standard mechanisms that can be used to differentiate service among the classes apply. The class-default class was predefined when you created the policy map, but you must configure it. If no default class is configured, then by default the traffic that does not match any of the configured classes is flow classified and given best-effort treatment. http://www.cisco.com/en/US/docs/ios/12_0t/12_0t5/feature/guide/cbwfq.html#wp25297

• Question 43:

  A voice gateway has the isdn switch-type command in the global configuration and on the T1 signaling channel.

  Which configuration takes precedence if the two configurations are different?

  A. The configuration in the global configuration always takes precedence over the interface configuration.
  B. The voice gateway parses the configuration from top to bottom and will use the first isdn switch-type entry.
  C. The voice gateway will use the isdn switch-type command that matches the ISDN switch that is connected to the T1 controller.
  D. The configuration in the T1 controller portion of the Cisco IOS configuration takes precedence over the isdn switch-type command in the global configuration.
  E. The configuration under the ISDN signaling channel takes precedence over the isdn switch- type command in the global configuration.
  E. The configuration under the ISDN signaling channel takes precedence over the isdn switch- type command in the global configuration.

• Question 44:

  Which types of voice ports allow a small office to provide outbound DNIS and inbound DID?

  A. FXS and FXO
  B. FXO and EandM
  C. FXS and FXS-DID
  D. FXS and EandM
  E. FXS-DID and FXO
  E. FXS-DID and FXO

  ---

  An FXO trunk is one of the simplest analog trunks available. Because Dialed Number Information Service (DNIS) information can only be sent out to the PSTN, no direct inward dialing (DID) is possible. ANI is supported for inbound calls. Two signaling types exist, loopstart and groundstart, with groundstart being the preferred method. An FXS DID trunk can receive only inbound calls, thus a combination of FXS DID, and FXO ports is required for inbound and outbound calls http:// www.cisco.com/en/US/docs/voice_ip_comm/cucme/srnd/design/guide/gatewy.html#wp10 52323

• Question 45:

  Which troubleshooting command will allow you to view the Cisco Unified Border Element operations for components such as the description of the media flow, negotiated parameters, and RTP port numbers?

  A. debug voice ccapi inout
  B. debug voip ipipgw
  C. debug ccsip all
  D. debug h245 events
  E. debug h225 events
  B. debug voip ipipgw

• Question 46:

  

  Refer to the exhibit. When an inbound PSTN call from 4087071222 arrives at the ISDN port that is shown in the exhibit, which dial peer will be matched for the inbound leg?

  A. Dial-peer 123, because incoming called-number takes precedence over answer-address.
  B. Dial-peer 2123, because answer-address takes precedence over incoming called-number.
  C. The matching inbound dial peer will be selected at random.
  D. Although dial-peer 123 takes precedence, there is no direct-inward-dial that is configured, therefore 2123 will be selected.
  E. Although dial-peer 123 takes precedence, there is no port that is configured under dial-peer 123, therefore dial-peer 2123 will be selected.
  A. Dial-peer 123, because incoming called-number takes precedence over answer-address.

• Question 47:

  Digital signal processors offload media processing functions from voice processing equipment.

  What is the function of the dsp services dspfarm command that is issued under the voice-card configuration mode?

  A. Provides resources for Flex-DSPRM status UP.
  B. Permits the codec rate to be attempted for SCCP-controlled connections.
  C. Takes the DSP resources that are not being used for the voice part and assigns them to a farm.
  D. Enables profile failed due to insufficient transcoding resources.
  C. Takes the DSP resources that are not being used for the voice part and assigns them to a farm.

• Question 48:

  The voice gateway selects an inbound VoIP dial peer by matching the information elements in the setup message with the dial-peer attributes. from the list on the left, drag the elements to the right and drop them in the order in which a voice gateway matches inbound calls. Not all options are used.

  Select and Place:

  

  

  ---

  Inbound Dial Peers Matching Process

  When the Cisco IOS router or gateway receives a call setup request, a dial peer match is made for the incoming call in order to facilitate routing the call to different session applications. This is not a digit-by-digit match; rather the full digit

  string received in the setup request is used to match against configured dial peers. The router or gateway matches the information elements in the setup message with the dial peer attributes to select an inbound dial peer. The router or

  gateway matches these items in this order:

  Called number (DNIS) with the incoming called-number command:

  First, the router or gateway attempts to match the called number of the call setup request with the configured incoming called-number of each dial peer. Because call setups always include DNIS information, it is recommended to use the

  incoming called-number command for inbound dial peer matching. This attribute has matching priority over the answer-address and destination-pattern commands.

  Calling Number (ANI) with the answer-address command:

  If no match is found in step 1, the router or gateway attempts to match the calling number of the call setup request with the answer-address of each dial peer. This attribute can be useful in situations where you want to match calls based on

  the calling number (originating).

  Calling Number (ANI) with the destination-pattern command:

  If no match is found in step 2, the router or gateway attempts to match the calling number of the call setup request to the destination-pattern of each dial peer. For more information about this, see the first bullet in the Dial Peer Additional

  Information section of this document.

  Voice-port (associated with the incoming call setup request) with configured dial peer port (applicable for inbound POTS call legs):

  If no match is found in the step 3, the router or gateway attempts to match the configured dial peer port to the voice-port associated with the incoming call. If multiple dial peers have the same port configured, the dial peer first added in the

  configuration is matched.

  If no match is found in the first four steps, then the default dial peer 0 command is used.

  http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010fed1.shtml#conv

• Question 49:

  The IP precedence marking uses which bits of the ToS IP header field?

  A. the two left-most bits
  B. the three left-most bits
  C. the four left-most bits
  D. the seven left-most bits
  B. the three left-most bits

• Question 50:

  What should you use to configure endpoint addressing if you are using Cisco Unified Communications Manager Express with SRST?

  A. POTS
  B. VoIP
  C. ephone-dn
  D. dial-peer
  C. ephone-dn