Cisco 642-437 Online Practice Questions and Exam Preparation

Cisco 642-437 Online Questions & Answers

• Question 21:

  What is the total bandwidth per call in a link, if you use a G.729 (high-complexity codec) with a 40- byte sample and Frame Relay with cRTP?

  A. 19,200
  B. 11,200
  C. 9,600
  D. 7,420
  C. 9,600

• Question 22:

  How many rules does a voice translation profile allow?

  A. up to 15
  B. up to 25
  C. up to 8
  D. up to 12
  A. up to 15

• Question 23:

  Which signaling protocol is defined by the ITU-T standard?

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

• Question 24:

  When configuring AutoQoS VoIP on a Cisco Catalyst switch how is the configuration performed?

  A. The auto qos voip command is applied to each interface.
  B. The auto qos voip command is applied globally in the switch.
  C. Each interface will need either the auto qos voip cisco-phone or auto qos voip trust on each interface depending on the upstream device.
  D. Each interface will need either the auto qos voip trust cisco-phone or auto qos voip trust trust on each interface depending on the upstream device.
  C. Each interface will need either the auto qos voip cisco-phone or auto qos voip trust on each interface depending on the upstream device.

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  The QoS mechanisms on a Catalyst switch differ from those QoS mechanisms found on a router. For example, while a router uses LLQ as a priority queuing strategy, a Catalyst switch might use weighted round-robin (WRR) as a priority queuing strategy. Fortunately, the AutoQoS feature available on some Catalyst switch models applies voice- specific QoS features globally to a Catalyst switch and also at the port level. To configure AutoQoS on supported Catalyst switch platforms, issue the following command from interface configuration mode:

  Switch(config-if)#auto qos voip [trust | cisco-phone] If the trust option is used in the previous command, the Catalyst switch makes queuing decisions based on Layer 2 Class of Service (CoS) markings. However, if the cisco-phone option is used, the Catalyst switch makes queuing decisions based on CoS markings originating from a Cisco IP phone. The switch detects the presence of a Cisco IP phone via the CDP. http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/ feature/guide/ftautoq1.html

• Question 25:

  What do you use an FXS for?

  A. an analog telephone
  B. a PBX
  C. an IP phone
  D. an E1
  A. an analog telephone

• Question 26:

  Which type of voice port supports immediate-start, wink-start, and delay-start followed by pulse or DTMF tones?

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

• Question 27:

  Refer to the exhibit. Your company's QoS policy states that all traffic that is arriving at access layer switches from IP phones should be marked with a DSCP value of 46 and that all untagged traffic that is arriving from a PC that is attached to an IP phone should be marked with a CoS value of 1. Which two options will satisfy the requirements for the CoS-to-DSCP map and are the correct QoS commands? (Choose two.)

  

  A. mls qos 1
  B. mls qos map cos-dscp 0 10 18 26 34 46 48 56
  C. mls qos cos 1
  D. mls qos map dscp 0 8 16 26 32 40 48 56
  E. mls qos map cos 0 8 18 26 40 48 50 56
  F. mls qos dscp 1
  B. mls qos map cos-dscp 0 10 18 26 34 46 48 56
  C. mls qos cos 1

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  To define the ingress Class of Service (CoS)-to-differentiated services code point (DSCP) map for trusted interfaces, use the mls qos map cos-dscp command in global configuration mode. mls qos map cos-dscp dscp1...dscp8 dscp1...dscp8 - Defines the CoS-to-DSCP map. For dscp1...dscp8, enter eight DSCP values that correspond to CoS values 0to 7. Separate consecutive DSCP values from each other with a space. The supported DSCP values are 0, 8, 10, 16, 18, 24, 26, 32, 34, 40, 46, 48, and 56. To define the default multilayer switching (MLS) class of service (CoS) value of a port or to assign the default CoS value to all incoming packets on the port, use the mls qos cos command in interface configuration mode. mls qos cos cos-value cos-value - Assigns a default CoS value to a port. If the port is CoS trusted and packets are untagged, the default CoS value is used to select one output queue as an index into the CoS-to- DSCP map. The CoS range is 0 to 7. The default is

  0. http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_m2.html#wp1041343

• Question 28:

  A TFTP server is configured with the IP address 10.10.10.150. Which command should you enter in the DHCP pool configuration mode to configure a client to use the defined TFTP server?

  A. option 150 10.10.10.150
  B. tftp-server ip 10.10.10.150
  C. tftp-server 10.10.10.150
  D. option 150 ip 10.10.10.150
  D. option 150 ip 10.10.10.150

• Question 29:

  Refer to the exhibit. An administrator is migrating a PBX telephony system to a VoIP solution using a fixed numbering plan. The extension numbers and PSTN DIDs cannot be changed. Which of the following methods can be used in order to reach the individual extensions at Site B when called via the PSTN?

  

  A. The administrator can replace the last three digits of the DID with xxx to cover the individual extensions.
  B. The administrator can replace the last three digits of the DID with xxx and use translation rules to map the individual extensions.
  C. The administrator needs to implement an auto-attendant solution where individual extensions can be dialed.
  D. The administrator needs to map the last four digits in the DID to the extension numbers using translation rules.
  D. The administrator needs to map the last four digits in the DID to the extension numbers using translation rules.

• Question 30:

  Which type of analog voice port would be used on a telephony device to connect to a telephone or fax machine?

  A. T1
  B. ear and mouth
  C. Foreign Exchange Office
  D. Foreign Exchange Station
  D. Foreign Exchange Station