Cisco 642-437 Online Practice Questions and Exam Preparation

Cisco 642-437 Online Questions & Answers

• Question 131:

  All calls over the IP WAN use G.729.IP phones A and B use Cisco Unified communications Manager Express. IP Phone A is on a call with IP Phone B. IP Phone A conference in Analog Phone c with IP Phone B. Software conference resources are not being used. Drag the appropriate DSP resources for each gateway from the list to the correct locations in the graphic so the call can be completed.

  Select and Place:

  

  

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  Order is: 1.Transcoder. 2.Conference Bridge 3.Media Termination Point http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_0_1/ccmsys/a05dsp.html

• Question 132:

  What are the three appropriate DSCP-to-CoS map statements that will assign AF31 and AF32 a CoS of 3, and AF42 a CoS of 4? (Choose three.)

  A. mls qos map dscp-cos 28 to 3
  B. mls qos map dscp-cos af31 to 3
  C. mls qos map dscp-cos 0 8 18 af31 34 46 48 56
  D. mls qos map dscp-cos 0 8 16 26 34 46 48 56
  E. mls qos map dscp-cos 32 to 3
  F. mls qos map dscp-cos 36 to 4
  A. mls qos map dscp-cos 28 to 3
  B. mls qos map dscp-cos af31 to 3
  F. mls qos map dscp-cos 36 to 4

• Question 133:

  Which two methods are used by a Cisco gateway to transmit fax traffic across the IP network? (Choose two.)

  A. fax pass-through
  B. T.30 signaling
  C. modem pass-through
  D. modem relay
  E. Cisco fax relay
  A. fax pass-through
  E. Cisco fax relay

• Question 134:

  Two networks have Resource Reservation Protocol and Cisco Unified Border Element gateway configuration. To RSVP reserve bandwidth and guarantee a minimum bit rate between these two networks, which command should you use on the outgoing gateway dial peer of the Cisco Unified Border Element?

  A. req-qos guaranteed-delay
  B. acc-qos guaranteed-delay
  C. ip rsvp bandwidth bandwidth
  D. h323-gateway voip rsvp-reserve
  A. req-qos guaranteed-delay

• Question 135:

  How does LLQ ensure that voice traffic is always expedited?

  A. LLQ adds WRED to CBWFQ. This allows delay-sensitive data such as voice to be dequeued and sent first.
  B. LLQ uses CBWFQ to prioritize voice traffic and by dequeuing the voice packets so they can be handled first.
  C. The strict priority queue has a higher weight than the queues in CBWFQ. This weight allows the delay- sensitive data such as voice to be dequeued and sent first.
  D. The LLQ strict priority queue allows delay-sensitive data such as voice to be dequeued and sent first (before packets in other queues are dequeued), giving delay-sensitive data preferential treatment over other traffic.
  D. The LLQ strict priority queue allows delay-sensitive data such as voice to be dequeued and sent first (before packets in other queues are dequeued), giving delay-sensitive data preferential treatment over other traffic.

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  Without Low Latency Queueing, CBWFQ provides weighted fair queueing based on defined classes with no strict priority queue available for real-time traffic. This scheme poses problems for voice traffic that is largely intolerant of delay, especially variation in delay. For voice traffic, variations in delay introduce irregularities of transmission manifesting as jitter in the heard conversation. The Low Latency Queueing feature provides strict priority queueing for CBWFQ, reducing jitter in voice conversations. Configured by the priority command, Low Latency Queueing enables use of a single, strict priority queue within CBWFQ at the class level, allowing you to direct traffic belonging to a class to the CBWFQ strict priority queue. http://www.cisco.com/en/US/docs/ios/12_0t/12_0t7/feature/guide/pqcbwfq.html

• Question 136:

  Which four voice and video issues are caused by the absence of QoS? (Choose four.)

  A. jitter
  B. delays
  C. circuit issues
  D. call setup failure
  E. echo
  F. defective CAT cable
  G. dropped calls
  A. jitter
  B. delays
  E. echo
  G. dropped calls

• Question 137:

  In which situation would the trust boundary be located at the access layer?

  A. if the endpoints, both IP phones and PCs, are incapable of marking traffic properly
  B. if PCs are switched through an IP phone and the IP phone traffic can be trusted to mark both traffic streams properly
  C. if the access layer switch cannot trust or re-mark incoming traffic from endpoints properly
  D. if there are endpoints that cannot be trusted and connect directly to the distribution layer
  A. if the endpoints, both IP phones and PCs, are incapable of marking traffic properly

• Question 138:

  What is the reason that a call succeeds when COR is applied to the incoming dial peer and is equal to or greater than the COR settings that are 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.
  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.

• Question 139:

  Which debug command can be used to show events specific to the Cisco Unified Border Element gateway?

  A. debug ip voip cube
  B. debug voip ipipgw
  C. debug ip cube
  D. debug voip cube events
  B. debug voip ipipgw

• Question 140:

  A small company would like to minimize the number of analog lines that they use to connect to the PSTN. They are considering a single FXO circuit.

  Which issue will they encounter if they deploy this solution?

  A. They won't be able to support DID and will require a mechanism to handle inbound calls, like PLAR to an operator line.
  B. They will be able to support both inbound and outbound calls without any issues.
  C. They will need an additional FXS-DID circuit to support inbound ANI.
  D. They will need an FXS port for inbound calls to carry ANI.
  A. They won't be able to support DID and will require a mechanism to handle inbound calls, like PLAR to an operator line.