Cisco 642-437 Online Practice Questions and Exam Preparation

Cisco 642-437 Online Questions & Answers

• Question 171:

  

  Refer to the exhibit. Which two of the following implementation methods will resolve the issue of overlapping extension numbers? (Choose two.)

  A. Implement a site code for each site that does not start with the digits 1 or 2.
  B. Implement an intersite prefix that does not conflict with the digits 1 or 2.
  C. Assign a unique username to each extension.
  D. Implement a private numbering plan.
  E. Implement an intersite prefix and a site code for each site. The prefix and site codes should not overlap with the extension numbers.
  A. Implement a site code for each site that does not start with the digits 1 or 2.
  E. Implement an intersite prefix and a site code for each site. The prefix and site codes should not overlap with the extension numbers.

• Question 172:

  What is the delta in the total end-to-end delay values of two voice packets in the voice flow?

  A. packet loss
  B. variable network delay
  C. end-to-end delay
  D. variation of delay
  E. bandwidth capacity
  D. variation of delay

• Question 173:

  Which option is used within a dial plan to define the destination that a user is allowed to call?

  A. dial peers
  B. calling peers
  C. calling privileges
  D. destination patterns
  C. calling privileges

• Question 174:

  What is the minimum number of RSVP peers that are necessary for a Cisco Unified Border Element to provide Call Admission Control?

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

• Question 175:

  Assuming no cRTP or header compression. How many VoIP G.729 calls can be made simultaneously over a 128-kb/s Frame Relay circuit (Layer 3) if 50 percent of the circuit is dedicated to voice and 50 percent is dedicated to data?

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

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  Bandwidth Calculation Formulas These calculations are used: Total packet size = (L2 header: MP or FRF.12 or Ethernet) + (IP/UDP/RTP header) + (voice payload size) Codec bit rate = codec sample size / codec sample interval PPS = (codec bit rate) / (voice payload size) Bandwidth = total packet size

  * PPS http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml

• Question 176:

  Which command should you use when checking for phone registration status or verifying button assignments?

  A. show IP phone
  B. show ephone-dn 9
  C. show ephone
  D. show telephony-service
  C. show ephone

• Question 177:

  Which two commands should you use on a common gateway between the two IP telephony networks to enable SIP to H.323 interworking? (Choose two.)

  A. allow-connections h323 to sip
  B. voice service h323 to sip
  C. voice service sip to h323
  D. allow-connections sip to h323
  A. allow-connections h323 to sip
  D. allow-connections sip to h323

• Question 178:

  Refer to the exhibit. What will the class map do if a packet arrives that is marked with a CoS of 6 and a DSCP value of EF?

  

  A. The class map will match the packet and forward it to the policy map to be marked.
  B. The class map will not map the packet and no QoS will be applied
  C. The class map will wait for the next packet in the stream to see if it has a CoS marking of 5 and then forward both packets to the policy map.
  D. For the packet to be forwarded to the policy map, it must have either a CoS of 5 or a DSCP value of EF.
  B. The class map will not map the packet and no QoS will be applied

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  If there is no match for a packet, no QoS processing occurs on the packet and the switch offers best-effort service to the packet. http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_see/confi guration/ guide/swqos.html

• Question 179:

  What is the reason that an outgoing call succeeds when COR is applied to the incoming dial peer, but no COR is applied to the outgoing dial peer?

  A. The COR list for incoming calls on the incoming dial peer is a superset of COR lists for outgoing calls on the outgoing dial peer.
  B. COR lists for incoming calls on the incoming dial peer are not a superset of COR lists for outgoing calls on the outgoing dial peer.
  C. The outgoing dial peer, by default, has the lowest priority.
  D. The incoming dial peer, by default, has the highest COR priority when no COR is applied.
  C. The outgoing dial peer, by default, has the lowest priority.

• Question 180:

  Which QoS mechanism for VoIP works with weighted fair queuing (WFQ) and class-based weighted fair queuing (CBWFQ)?

  A. Header compression
  B. FRF.12
  C. IP RTP Priority and Frame Relay IP RTP Priority
  D. Multilink PPP
  E. RSVP
  C. IP RTP Priority and Frame Relay IP RTP Priority