Q&A. DEMO Version

Transcription

1 Cisco Voice over IP (CVOICE) Q&A DEMO Version Copyright (c) 2010 Chinatag LLC. All rights reserved.

2 Important Note Please Read Carefully For demonstration purpose only, this free version Chinatag study guide contains 10 full length questions selected from our full version products which have more than 200 questions each. This Study guide has been carefully written and compiled by Chinatag certification experts. It is designed to help you learn the concepts behind the questions rather than be a strict memorization tool. Repeated readings will increase your comprehension. For promotion purposes, all PDF files are not encrypted. Feel free to distribute copies among your friends and let them know Chinatag website. Study Tips This product will provide you questions and answers along with detailed explanations carefully compiled and written by our experts. Try to understand the concepts behind the questions instead of cramming the questions. Go through the entire document at least twice so that you make sure that you are not missing anything. Latest Version We are constantly reviewing our products. New material is added and old material is revised. Free updates are available for 90 days after the purchase. You should check the products page on the website for an update 3-4 days before the scheduled exam date. Please tell us what you think of our products. We appreciate both positive and critical comments as your feedback helps us improve future versions. Feedback on specific questions should be send to feedback@chinatag.com. Thanks for purchasing our products and look forward to supplying you with all your Certification training needs. Good studying! Technical and Support Team Chinatag LLC. Leading the way in IT testing and certification tools,

3 QUESTION 1 Refer to the exhibit. You have been asked to configure a dial peer on R2 that will match only the extensions of the four telephones attached. Which dial-peer statement will you use? A. dial-peer voice 1 pots destination-pattern 5552.[0-5]0 B. dial-peer voice 1 pots destination pattern 5552[5-6].0 C. dial-peer voice 1 pots destination-pattern 555[2-5][56] D. dial-peer voice 1 pots destination-pattern 5552[5-6][05]0 Answer: D QUESTION 2 Refer to the exhibit. When extension dials , how are the digits manipulated in R1 so that they are presented correctly at R2? 3

4 A. The outbound VoIP dial peer is matched and all digits are sent. B. The digits are stripped off before matching the outbound POTS dial peer. C. The digits are stripped off by the connection trunk and R2 receives only D. R1 collects the 1200 and prepends the tie-line digits That number is matched to a VoIP dial peer and sent to the appropriate address. Answer: A QUESTION 3 Refer to the exhibit. Your customer wants to converge the existing PBX network with the IP network. The three remote offices have various types of PBXs. The customer is using a combination of tie-lines and trunks to connect the PBXs today. Which kind of connection should be implemented to allow calls to be placed from to so that when the call is completed, network resources are returned for other uses? 4

5 A. PLAR B. trunk C. tie-line D. answer-mode Answer: C QUESTION 4 Which dial plan characteristic shows the most obvious improvement by dropping a number translation step? A. availability B. post-dial delay C. scalability D. hierarchical design Answer: B Post dial delay: Post-dial delay is the time between when the last digit is dialed and the moment the phone rings at the receiving location. The more translations, digit manipulations, and lookups that take place, the longer the post dial delay becomes. Overall network design, translation rules, and alternate paths affect post dial delay. Minimize the amount of dial peers and translations to reduce post-dial delay. QUESTION 5 Which option is true concerning the MGCP call agent? A. acts only as a recorder of call details B. provides only call signaling and call setup C. manages all aspects of the call and voice stream D. monitors the quality of each call after setup Answer: B MGCP Call Agent is a central control component to remotely control various devices. When the MGCP call agent exists in the network, calls are routed via route patterns on the Call Agent (Cisco Unified Communications Manager), not by dial peers on the gateway. The messages sent between the voice gateway and the MGCP Call Agent are just used for call signaling and call setup only. In summary, the Call Agent will instruct the gateways what to do in each stage: receive dialed digits, find the destination gateway, send connection request Finally, the Call Agent will allow gateways to establish RTP Streams with each other. Notice that the voice streams only flow between the two voice gateways, not to the Call Agent. At the conversation finishs (one of the endpoints goes on-hook), that gateway notifies the Call Agent and the Call Agent sends Delete Connection (DLCX) Requests for both gateways. QUESTION 6 At what point does the MGCP call agent release the setup of the call path to the residential gateways? 5

6 A. after the call agent has been notified that an event occurred at the source residential gateway B. after the call agent has been notified of an event and has instructed the source residential gateway to create a connection C. does not release call path setup D. after the call agent has sent a connection request to both the source and destination and has relayed a modify-connection request to the source so that the source and destination can set up the call path E. after the call agent has forwarded session description protocol information to the destination from the source and has sent a modify connection to the destination and a create-connection request to the source Answer: D Below is the call flow between two voice gateway through a MGCP Call Agent. The MGCP call agent releases the setup of the call path to the residential gateways when the conversation begins. After sending the Modify Connection (MDCX), the two gateways have enough information to start the conversation so the duty of the Call Agent finishs. QUESTION 7 Refer to the exhibit for IP addresses and telephone numbers. You are working with a customer opening a small sales office in Atlanta. You want the user in Atlanta to be able to dial into the PBX in New York over the IP WAN. The New York PBX uses ground start, a two-wire operation, and DTMF dialing. Choose the correct FXO port configuration commands for New York. 6

7 A. voice-port 1/0/0 signal ground-start operation 2-wire dial-type dtmf B. voice-port 1/1/1 destination signal ground-start operation 2-wire type 1 dial-type dtmf C. voice port 1/0/0 session target ipv4: destination signal ground-start operation 2-wire dial-type dtmf D. voice port 1/0/0 session target ipv4: source signal wink-start operation 2-wire dial-type dtmf Answer: A QUESTION 8 Refer to the exhibit. Lighthorse Equine Management would like to investigate converging voice and data on their existing T1 Frame Relay WAN link between New York and Atlanta. Currently the following list of applications are consuming no more bandwidth than what is listed on this segment of the network. T1 link 1536 kbps 75 kbps 7

8 internet 200 kbps Oracle 500 kbps FTP 250 kbps Total 1025 kbps The customer has allocated 25% of the WAN link for routing updates and other overhead. They would like to increase the number of samples encapsulated in each PDU to 40 ms. You have calculated 6 bytes of overhead for Frame Relay, no crtp, and the use of the G.711 codec. How many simultaneous calls could be placed on this link? A. 0 calls B. 1 call C. 2 calls D. no more than 5 calls E. no more than 10 calls F. no more than 20 calls Answer: B QUESTION 9 Refer to the exhibit. A QoS strategy has already been deployed on the LAN. Choose three WAN QoS best practices that should be used over the WAN link. (Choose three.) A. Implement NBAR. B. Implement admission control. C. Mark voice traffic as EF in DSCP. D. Mark voice traffic highest priority in 802.1p. E. Use crtp to maximize bandwidth utilization. F. Configure access switches to trust traffic from IP phones. Answer: BCE QUESTION 10 When setting up a VoIP call, what is the first thing a gateway router tries to match to a dialed number? A. call leg 8

9 B. IP route C. session target D. destination pattern Answer: D First, the gateway attempts to match the called number with the incoming called-number. If no match is found, the router or gateway attempts to match the calling number of the call set-up request with the answer-address of each dial-peers. If no match is found, it attempts to match the calling number of the call set-up request to the destination-pattern of each dial-peer. Notice that these steps are just applied for inbound dial peer. 9