642-452题库下载

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<p align="left"><p align="left">最新642-452题库分享</p></p><p align="left"><p align="left">1. Refer to the exhibit. Highland Park Property Development is integrating a Cisco CallManager system with the existing PBX via an E1 QSIG trunk. After the initial configuration, no calls can be placed from IP phones to PBX phones. How can this problem be resolved?</p></p><p align="left"><p align="left">A. Add the command isdn contiguous-bchan to the serial interface.</p></p><p align="left"><p align="left">B. Change the channel selection order from descending to ascending.</p></p><p align="left"><p align="left">C. Add the command isdn negotiate-bchan to the serial interface.</p></p><p align="left"><p align="left">D. Increase the ISDN T302 timer to allow more time for call setup.</p></p><p align="left"><p align="left">Answer: C</p></p><p align="left"><p align="left">2. Which dial peer will send calls to the PSTN via the CAS T1 using this controller configuration?controller t1 3/0framing esflinecode b8zsds0-group 1 timeslots 1-24 type e&amp;m-wink-start</p></p><p align="left"><p align="left">A. dial-peer voice 1 potsdestination-pattern 9.@port 3/0:1</p></p><p align="left"><p align="left">B. dial-peer voice 1 potsdestination-pattern 9.@port 3/0:24</p></p><p align="left"><p align="left">C. dial-peer voice 1 potsdestination-pattern 91port 3/0:1</p></p><p align="left"><p align="left">D. dial-peer voice 1 potsdestination-pattern 91port 3/0:24</p></p><p align="left"><p align="left">Answer: C</p></p><p align="left"><p align="left">3. Which three features are available during SRST failover? (Choose three.)</p></p><p align="left"><p align="left">A. music on hold</p></p><p align="left"><p align="left">B. IP phone speed dial</p></p><p align="left"><p align="left">C. distinctive ring</p></p><p align="left"><p align="left">D. call forwarding</p></p><p align="left"><p align="left">Answer: ABC</p></p><p align="left"><p align="left">4. Refer to the exhibit. What is the purpose of the TCL script snippet?</p></p><p align="left"><p align="left">A. process a script exit</p></p><p align="left"><p align="left">B. play an audio prompt</p></p><p align="left"><p align="left">C. terminate a call</p></p><p align="left"><p align="left">D. gather initial digits</p></p><p align="left"><p align="left">E. interrupt a call in progress</p></p><p align="left"><p align="left">Answer: D</p></p><p align="left"><p align="left">5. In a particular company, field offices route calls to headquarters out IP gateways to the PSTN. The numbers are all of the form 1-202-454-XXXX. When dialing, the field offices wish to dial only the last four digits. Which of the following Cisco IOS commands must be a part of the PSTN dial peer on the field office gateways?</p></p><p align="left"><p align="left">A. no digit-strip</p></p><p align="left"><p align="left">B. prefix 1</p></p><p align="left"><p align="left">C. num-exp .... 1202454....</p></p><p align="left"><p align="left">D. rule 1 ^202454 1</p></p><p align="left"><p align="left">Answer: C</p></p><p align="left"><p align="left">6. A company determines that all long-distance calls to area code 603 will route across the WAN. The destination gateway is 10.172.163.5 connected through serial interface 1/0. Which set of Cisco IOS commands will accomplish this?</p></p><p align="left"><p align="left">A. dial-peer voice 100 potsdestination-pattern 1603.......port ipv4:10.172.163.5</p></p><p align="left"><p align="left">B. dial-peer voice 101 voipdestination-pattern 1603.......port 1/0</p></p><p align="left"><p align="left">C. dial-peer voice 102 voipdestination-pattern 1603.......session-target ipv4:10.172.163.5</p></p><p align="left"><p align="left">D. dial-peer voice 103 potsdestination-pattern 1603.......session-target 1/0</p></p><p align="left"><p align="left">Answer: C</p></p><p align="left"><p align="left">7. You have a client that is a national organization that has deployed an IP telephony network across all of the offices. The organization is divided into geographic regions. These regions include the east, the midwest, and the west. The organization would like to deploy a directory gatekeeper to provide dial-plan resolution for all of the regions. Which three statements correctly describe a DGK solution? (Choose three.)</p></p><p align="left"><p align="left">A. provides fault tolerance through a full mesh of regional gatekeepers</p></p><p align="left"><p align="left">B. allows up to a four-tier gatekeeper hierarchy to be deployed</p></p><p align="left"><p align="left">C. simplifies regional gatekeeper provisioning</p></p><p align="left"><p align="left">D. does not limit the number of hops in an LRQ</p></p><p align="left"><p align="left">E. allows local zones and LRQ forwarding zones to be mixed</p></p><p align="left"><p align="left">F. The directory-gatekeeper maintains states about the forwarded-LRQ calls.</p></p><p align="left"><p align="left">Answer: BCE</p></p><p align="left"><p align="left">8. A service provider wants to add SIP devices to the existing H.323 voice network. Which Cisco device will allow the SIP devices to use the existing routing structure on the H.323 gatekeeper?</p></p><p align="left"><p align="left">A. SIP voice gateway</p></p><p align="left"><p align="left">B. Cisco SIP Proxy Server</p></p><p align="left"><p align="left">C. Cisco SIP Redirect Server </p></p><p align="left"><p align="left">D. Cisco SIP Registrar Server</p></p><p align="left"><p align="left">Answer: B</p></p>