Cisco 642-437 Online Practice Questions and Exam Preparation

Cisco 642-437 Online Questions & Answers

• Question 141:

  Refer to the exhibit.

  

  A new Cisco Unified Communications Manager Express system has been deployed and the technician is trying to add the first new IP phone to the system. The phone powers up, but it does not register with the system. The technician has verified that the phone is getting the proper VLAN information from Cisco Discovery Protocol. The phone is also getting the correct IP address and TFTP server address from DHCP. The phone has been assigned to an ephone and the correct MAC address is configured. With the information provided, which two of the following does the administrator need to verify to resolve this situation? (Choose two.)

  A. Verify that the ip helper-address is correctly configured.
  B. Verify that telephony-service has been configured.
  C. Verify that the ephone has a button assigned.
  D. Verify that the tftp-server path has been configured.
  E. Verify that the Cisco Unified Communications Manager Express service is running.
  F. Verify that the correct phone type files are in the tftp-server path.
  D. Verify that the tftp-server path has been configured.
  F. Verify that the correct phone type files are in the tftp-server path.

  ---

  Since the phone is getting the correct TFTP address, the next thing that needs to be verified is the TFTP Server path and IP Reachablity for the IP Phone to the TFTP Server. Once the TFTP settings has been verified, check if the files mentioned in the termxx.defaults.loads file is available in the TFTP Server for the phone to download. http://www.cisco.com/en/US/docs/voice_ip_comm/ cuipph/7960g_7940g/7_0/sip/english/admini stration/guide/7960trbS.html

• Question 142:

  Which three call permissions are assigned with the Employee calling privileges? (Choose three.)

  A. long distance
  B. international
  C. 911 (emergency)
  D. local
  A. long distance
  C. 911 (emergency)
  D. local

• Question 143:

  What is the function of class-based marking?

  A. Marking packets is based only on CoS value, IP precedence value or DSCP value allows Layer 3 frames to be identified and distinguished from other packets.
  B. Marking frames based only on CoS value or IP precedence value allows Layer 2 frames to be identified and distinguished from other frames.
  C. Marking frames or packets sets information in the Layer 2 and Layer 3 headers of a packet so that the frame or packet can be identified and distinguished from other frames or packets in the same traffic flow.
  D. Marking frames only sets information in the Layer 2 headers of a frame so that the frame can be identified and distinguished from other packets or frames.
  E. Marking allows network devices to classify a packet or frame, based on a specific traffic descriptor.
  E. Marking allows network devices to classify a packet or frame, based on a specific traffic descriptor.

• Question 144:

  Which command should you use to activate the analog voice port in voice-port configuration mode?

  A. voice-port slot/ port
  B. no shutdown
  C. cptone locale
  D. dial-type {dtmf | pulse}
  B. no shutdown

• Question 145:

  What are the PHBs that DiffServ use?

  A. resource reservation and admission control
  B. default, AF, and EF PHBs
  C. AF, EF, and CS PHBs
  D. AF and EF PHBs
  E. default, AF, EF, and CS PHBs
  E. default, AF, EF, and CS PHBs

  ---

  A Per Hop Behavior refers to the packet scheduling, queuing, policing, or shaping behavior of a node on any given packet belonging to a Behavior Aggregate, and as configured by a Service Level Agreement (SLA) or policy. To date, four standard PHBs are available to construct a DiffServ-enabled network and achieve coarse-grained, end-to-end CoS and QoS: The Default PHB, Class-Selector PHBs, Expedited Forwarding PHB and Assured Forwarding PHB.

  http://www.cisco.com/en/US/technologies/tk543/tk766/technologies_white_paper09186a00800a 3e2f_ps6610_Products_White_Paper.html

• Question 146:

  Which queuing method is the basis for the low latency queuing?

  A. weighted random early detection
  B. custom queuing
  C. weighted fair queuing
  D. class-based weighted fair queuing
  D. class-based weighted fair queuing

• Question 147:

  A new Cisco 7965 IP phone is installed on a Cisco Unified Communications Manager Express system. When the phone requests the .loads file from the TFTP server, it sees that the versions are different. What does the IP phone do to resolve this issue?

  A. The IP phone requests the SEP.cfg file and reboots.
  B. The IP phone attempts to obtain the new firmware file image from the TFTP server.
  C. The IP phone boot requests the XMLDefault.cnf.xml file and boots up.
  D. The IP phone does not boot up and will require manual intervention to factory reset the phone before a new firmware image can be downloaded.
  B. The IP phone attempts to obtain the new firmware file image from the TFTP server.

  ---

  Cisco IP Phone Initialization Process:

  1.

  At initialization, the Cisco IP phone sends a request to the DHCP server to get an IP address, DNS server address, and TFTP server name or address, if appropriate. Options are set in DHCP server (Option 066, Option 150, and so on). It also gets a default gateway address if set in DHCP server (Option 003).

  2.

  If a DNS name of the TFTP sever is sent by DHCP, then a DNS sever IP address is required to map the name to an IP address. This step is bypassed if the DHCP server sends the IP address of the TFTP server. In this case study, the DHCP server sent the IP address of TFTP because DNS was not configured.

  3.

  If a TFTP server name is not included in the DHCP reply, then the Cisco IP phone uses the default server name.

  4.

  The configuration file (.cnf) file is retrieved from the TFTP server. All .cnf files have the name SEP.cnf, where "SEP" is an acronym for Selsius Ethernet Phone. If this is the first time the phone is registering with the Cisco CallManager, then a default file, SEPdefault.cnf, is downloaded to the Cisco IP phone.

  5.

  All .cnf files include the IP address(es) of the primary and secondary Cisco CallManager(s). The Cisco IP phone uses the IP address to contact the primary Cisco CallManager and register. 6.Once the Cisco IP phone has connected and registered with Cisco CallManager, the Cisco CallManager tells the Cisco IP phone which executable version (called a load ID) to run. If the specified version does not match the executing version on the Cisco IP phone, the Cisco IP phone will request the new executable from the TFTP server and reset automatically.

  http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080129d92 .shtml

• Question 148:

  Which of the following best describes the implementation challenges that are associated with variable- length numbering plans?

  A. the variable number of extensions that need to be implemented
  B. the number of trunks that need to be assigned
  C. the mapping between IP addresses and extension numbers
  D. the identification of the number of digits that need to be dialed before the call is routed
  E. the degree in which the dial plan varies
  D. the identification of the number of digits that need to be dialed before the call is routed

• Question 149:

  What are the three acceptable values for one-way delay, jitter, and packet loss in a VoIP network? (Choose three.)

  A. 0-400 ms for delay
  B. 1 packet loss
  C. 20 ms for jitter
  D. 0-150 ms for delay
  E. 1 percent packet loss
  F. 30 ms for jitter
  A. 0-400 ms for delay
  E. 1 percent packet loss
  F. 30 ms for jitter

• Question 150:

  Which three methodologies are specific types of QoS used on a 512-kb/s point-to-point IP WAN link? (Choose three.)

  A. header compression
  B. FRF.12
  C. LLQ
  D. Multilink PPP
  E. RSVP
  A. header compression
  B. FRF.12
  C. LLQ