Cisco 642-437 Online Practice Questions and Exam Preparation

Cisco 642-437 Online Questions & Answers

• Question 121:

  You are configuring a Cisco Unified Border Element. What do you need to do to achieve address hiding?

  A. Under the voice service configuration mode, issue the media flow-around command.
  B. Under the dial-peer configuration mode, issue the codec flow-through command.
  C. Activate the voice service voip command at the dial-peer configuration mode.
  D. Under the dial-peer configuration mode, issue the media flow-through command.
  D. Under the dial-peer configuration mode, issue the media flow-through command.

• Question 122:

  For multisite deployments with distributed call processing, which three dial plan solutions does Cisco recommend? (Choose three.)

  A. using access and site codes
  B. implementing PSTN access
  C. defining remote site redundancy options
  D. defining Call Admission Control for Cisco Extension Mobility
  E. implementing PSTN backup
  F. implementing Service Advertisement Framework
  A. using access and site codes
  B. implementing PSTN access
  E. implementing PSTN backup

• Question 123:

  Which command is used to view the COR list?

  A. show voip ccapi inout
  B. show dial-peer cor
  C. show dial-peer summary
  D. show ip interface brief
  B. show dial-peer cor

• Question 124:

  Which command correctly enables a trust of the existing differentiated services code point value coming into a switch?

  A. switch(config-mls)#mls qos trust dscp
  B. switch(config-if)#mls qos trust dscp
  C. switch(config-if)#mls dscp trust
  D. switch(config-mls)#dscp trust
  B. switch(config-if)#mls qos trust dscp

• Question 125:

  Which command should you use to configure a dial peer to support T.38 fax relay and to use Cisco fax relay if T.38 negotiation is unsuccessful?

  A. fax protocol t38 fallback cisco
  B. fax t38 fallback cisco
  C. fax relay t38 cisco
  D. fax relay t38 backup ciscorelay
  A. fax protocol t38 fallback cisco

• Question 126:

  Which Session Initiation Protocol server role is given to the component that implements a mechanism to resolve addresses?

  A. location server
  B. naming server
  C. Session Initiation Protocol proxy
  D. Session Initiation Protocol router
  A. location server

• Question 127:

  Which SCCP directory number type can have a line appearance that can be used to answer a call at more than one endpoint, but can only answer one call at a time?

  A. single-line
  B. dual-line
  C. shared-line, nonexclusive
  D. two directory numbers with one telephone number
  E. shared-line, exclusive F. octo-line
  E. shared-line, exclusive F. octo-line

• Question 128:

  Drag the statement from the left to the protocol name that is associated with it on the right.

  Select and Place:

  

  

  ---

  The Real-Time Transport Protocol (RTP) is an Internet protocol standard that specifies a way for programs to manage the real-time transmission of multimedia data over either unicast or multicast network services. RTP is commonly used in Internet telephony applications. RTP does not in itself guarantee real-time delivery of multimedia data; it does, however, provide the wherewithal to manage the data as it arrives to best effect. RTP combines its data transport with a control protocol (RTCP), which makes it possible to monitor data delivery for large multicast networks. When protocols are used in conjunction, RTP is originated and received on even port numbers and the associated RTCP communication uses the next higher odd port number. Monitoring allows the receiver to detect if there is any packet loss and to compensate The Secure Real-time Transport Protocol (or SRTP) defines a profile of RTP (Real-time Transport Protocol), intended to provide encryption, message authentication and integrity, and replay protection to the RTP data in both unicast and multicast applications. Since RTP is closely related to RTCP (Real Time Control Protocol) which can be used to control the RTP session, SRTP also has a sister protocol, called Secure RTCP (or SRTCP); SRTCP provides the same security-related features to RTCP, as the ones provided by SRTP to RTP. Utilization of SRTP or SRTCP is optional to the utilization of RTP or RTCP; but even if SRTP/SRTCP are used, all provided features (such as encryption and authentication) are optional and can be separately enabled or disabled. The only exception is the message authentication feature which is indispensably required when using SRTCP. On slow links, it may be advantageous to compress the IP/UDP/RTP headers using Compressed RTP (cRTP). If you use cRTP then the 40 bytes of overhead incurred by the IP/UDP/RTP headers can typically be compressed down to 2 to 4 bytes (2 bytes when no UDP checksums are sent, and 4 bytes when checksums are sent). Enabling compression on both ends of a lowbandwidth serial link can greatly reduce the network overhead if it carries a lot of RTP traffic. cRTP is supported on serial lines using Frame Relay, HDLC, or PPP encapsulation. It is also supported over ISDN interfaces. CRTP should not be used on links greater than 2 Mbps.

• Question 129:

  Which statement about the DiffServ model is true?

  A. DiffServ provides traffic management using QoS classifications.
  B. DiffServ specifies a mechanism for classifying and managing network traffic and providing QoS on modern IP networks.
  C. DiffServ is based on building a virtual circuit in the Internet using the bandwidth reservation technique.
  D. DiffServ is a way to provide the assurance of sufficiently low delay and packet loss for certain types of applications or traffic.
  B. DiffServ specifies a mechanism for classifying and managing network traffic and providing QoS on modern IP networks.

• Question 130:

  Which of these is assigned to a phone or line to implement calling privileges?

  A. class of service
  B. partition
  C. calling search space
  D. route list
  C. calling search space