Cisco 642-437 Online Practice Questions and Exam Preparation

Cisco 642-437 Online Questions & Answers

• Question 151:

  Which codec complexity type will offer the greatest number of voice channels, provided that the complexity type is compatible with the particular codecs that are in use?

  A. low complexity
  B. medium complexity
  C. high complexity
  D. flex complexity
  A. low complexity

  ---

  Codec complexity refers to the amount of processing required to perform voice compression. Codec complexity af- fects the call density--the number of calls reconciled on the DSPs. With higher codec complexity, fewer calls can be handled. Select a higher codec complexity if that is required to support a particular codec or combination of codecs. Select a lower codec complexity to support the greatest number of voice channels, provided that the lower complexity is compatible with the particular codecs in use. http://www.cisco.com/en/US/docs/ios/12_3t/voice/command/reference/vrht_c6_ps5207_TSD_Produc ts_Command_Reference_Chapter.html

• Question 152:

  If a centralized solution has to be implemented on multiple-equipment vendors devices, which signaling protocol should be used?

  A. Session Initiation Protocol
  B. Media Gateway Control Protocol
  C. Skinny Client Control Protocol
  D. H.323 protocol
  B. Media Gateway Control Protocol

• Question 153:

  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 destination-pattern takes precedence over answer-address.
  B. Dial-peer 2123, because answer-address takes precedence over destination-pattern.
  C. The matching inbound dial peer will be selected at random.
  D. Although dial-peer 2123 takes precedence, it will not be matched because the command direct-inward- dial is missing.
  E. Dial-peer 123 will be matched because dial-peer 2123 will strip all the digits.
  B. Dial-peer 2123, because answer-address takes precedence over destination-pattern.

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  The inbound call will first try to match the with the incoming called-number command. We can also use `answer-address command' which is searched if `incoming called-number' is not present. And if there is no `incoming called-number command' and `answer-address command', then the gateway will hunt for dialpeer with destination-pattern of calling party number.

  http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/dial_peer/dp_confg.html#wp1067989

• Question 154:

  Which version of Cisco Unified Communications Manager Express is recommended that is supported on endpoints running Cisco IOS 15.0(1)M?

  A. 8
  B. 7
  C. 7.1
  D. 8.5
  C. 7.1

• Question 155:

  You are configuring a network to support voice to the PSTN. One important aspect to the configuration is to be able to determine the individual slot, subunit, and port number from the gateway endpoint identifier. Which signaling protocol is appropriate for this situation?

  A. H.323
  B. SIP
  C. SCCP
  D. MGCP
  D. MGCP

  ---

  Endpoints are any of the voice ports on the designated gateway. These voice ports provide connectivity to both analog ports and digital trunks to the PSTN. Ports on gateways are identified by endpoints in very specific ways. It is important to note that gateways can have multiple endpoints dependent on the number of ports it contains, and that the endpoints are case insensitive. A sample MGCP endpoint addressing scheme is provided below.

  

  http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00801da84e.shtml

• Question 156:

  In a voice gateway, the configured codec complexity of the DSPs on a voice card can be changed. What is the impact on the DSPs if high codec complexity is configured?

  A. The codec complexity affects call density, which is the number of calls that are reconciled on the DSPs. This results in lower call density when high complexity is configured.
  B. With higher codec complexity, more calls can be processed.
  C. Lower codec complexity supports the fewest number of voice channels, provided that the lower complexity is compatible with the particular codecs that are in use.
  D. The DSP will process codecs that support high complexity transparently and shift to flex mode for those codecs that are not high complexity.
  A. The codec complexity affects call density, which is the number of calls that are reconciled on the DSPs. This results in lower call density when high complexity is configured.

  ---

  The difference between medium and high complexity codecs is the amount of CPU utilization necessary to process the codec algorithm, and therefore, the number of voice channels that can be supported by a single DSP. For this reason, all the medium complexity codecs can also be run in high complexity mode, but fewer (usually half) of the channels are available per DSP.

  http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00800b6710.shtml#cod e_com

• Question 157:

  Refer to the exhibit. When an inbound PSTN call to 4087071222 is received by the router that is shown in the exhibit, what is the resulting called number?

  

  A. 14087071222
  B. 11222
  C. 14081222
  D. 1222
  E. 4087071222
  D. 1222

  ---

  /^.*\(....$\) Truncates Numbers down to the last 4 digits. http://www.cisco.com/en/US/tech/ tk652/tk90/technologies_tech_note09186a0080325e8e.shtml

• Question 158:

  How does a Cisco Unified Border Element support codec filtering?

  A. The Cisco Unified Border Element relies on the endpoint that initiates the call to determine which codes the call will use.
  B. The Cisco Unified Border Element can be configured to support codec filtering by adding a list of supported codecs in global configuration mode.
  C. The Cisco Unified Border Element can be configured to support codec filtering by adding one or more codec types to each dial peer that is configured in the device.
  D. The Cisco Unified Border Element will only support codec filtering in media flow-around mode so that endpoints can negotiate a specific codec independently.
  C. The Cisco Unified Border Element can be configured to support codec filtering by adding one or more codec types to each dial peer that is configured in the device.

• Question 159:

  Which statement is true for an ephone-dn that has no COR applied?

  A. Calls can be made from this ephone-dn to all possible numbers from the local router.
  B. Calls cannot be made from this ephone-dn.
  C. Calls can be made from this ephone-dn only to another ephone-dn on the local router.
  D. Calls can be made from this ephone-dn only to external numbers.
  A. Calls can be made from this ephone-dn to all possible numbers from the local router.

• Question 160:

  Which command is used to assign 20% of the bandwidth of an interface to a traffic class with priority?

  A. router(config-cmap)#priority percent 20
  B. router(config-pmap-c)#bandwidth percent 20
  C. router(config-pmap-c)#priority percent 20
  D. router(config-cmap)#bandwidth percent 20
  C. router(config-pmap-c)#priority percent 20