Exam Number/Code: 642-845

Exam Name: Optimizing Converged Cisco Networks

Updated:3/1/2010

Questons and Answers : 152 questions

Exam Language(s): English

1. Which two Cisco AutoQoS interface statements are true? (Choose two.)Select 2 response(s).A. AutoQoS is supported on Frame Relay multipoint subinterfaces.B. AutoQoS is supported on low-speed ATM PVCs in point-to-point subinterfaces.C. AutoQoS is supported on serial PPP and HDLC interfaces.D. AutoQoS is supported only on Frame Relay main interfaces and not on any subinterface configuration.Answer: BC 2. Which two wireless security statements are true? (Choose two.)Select 2 response(s).A. A TACACS+ server is required to implement 802.1x.B. MIC protects against man-in-the-middle and replay attacks.C. The 802.1x standard provides encryption services for wireless clients.D. The AES (symmetric block cipher) is specified in the IEEE 802.11i specification.E. The IEEE 802.11i specification uses RC4 as its encryption mechanism.F. WPA requires TKIP and AES as encryption methods.Answer: BD 3. Which two statements regarding the Wireless LAN Solution Engine (WLSE) are true? (Choose two.)Select 2 response(s).A. To support fault and policy reporting, the WLSE requires a Wireless Control System (WCS).B. When WLSE detects an AP failure, it automatically increases the power and cell coverage of nearby APs.C. WLSE requires the 2700 location appliance to offer location tracking.D. WLSE can locate rogue APs and automatically shut them down.E. WLSE configuration is done using the command line interface (CLI) or a WEB based template.Answer: BD 4. Which two statements are true about the function of CAC? (Choose two.)Select 2 response(s).A. CAC provides guaranteed voice quality on a link.B. CAC artificially limits the number of concurrent voice calls.C. CAC is used to control the amount of bandwidth that is taken by a call on a link.D. CAC prevents oversubscription of WAN resources that is caused by too much voice traffic.E. CAC allows an unlimited number of voice calls while severely restricting, if necessary, other forms of traffic.F. CAC solves voice congestion problems by using QoS to give priority to UDP traffic.Answer: BD 5. Which two statements are true about the implementation of QoS? (Choose two.)Select 2 response(s).A. Implementing DiffServ involves the configuration of RSVP.B. Implementing IntServ allows QoS to be performed by configuring only the ingress and egress devices.C. Implementing IntServ involves the utilization of RSVP.D. Traffic should be classified and marked by the core network devices.E. Traffic should be classified and marked as close to the edge of the network as possible.Answer: CE 6. What are the steps for configuring stateful NBAR for dynamic protocols?Select the best response.A. Use the command ip nbar protocol-discovery to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface.B. Use the command match protocol rtp to allow identification of real-time audio and video traffic. Use the command ip nbar port-map to extend the NBAR functionality for well-known protocols to new port numbers.C. Use the command match protocol to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface.D. Configure a traffic class. Configure a traffic policy. Attach the traffic policy to an interface.E. Configure video streaming. Configure audio streaming. Attach the codec to an interface.Answer: D 7. Two sites are using a multisite centralized call processing model. The voice gateway on the remote branch has lost IP connectivity to its Cisco CallManager server. Which feature enables the remote gateway to take the role of the call agent during the WAN failure?Select the best response.A. automated alternate routing (AAR)B. Cisco CallManager Attendant ConsoleC. real-time protocol (RTP)D. Survivable Remote Site Telephony (SRST)Answer: D 8. Refer to the exhibit. Both routers have been configured as VoIP gateways. They must also support traditional telephony devices to connect to analog telephones. Which two configuration changes would correctly support the voice requirements? (Choose two.)Select 2 response(s).A. On each router, under the dial-peer voice 1 pots configuration, add the port fa0/0 command.B. On each router, under the dial-peer voice 1 pots configuration, add the port 1/0/0 command.C. On each router, configure dial-peer voice 1 as a voip connection and configure dial-peer voice 2 as a pots connection.D. Under the dial-peer voice 1 pots configuration, change the destination pattern of 1111 to 2222 on the R1 router, and 2222 to 1111 on the R2 router.E. Under the dial-peer voice 2 voip configuration, change the destination pattern of 1111 to 2222 on the R1 router, and 2222 to 1111 on the R2 router.F. Under the dial-peer voice 2 voip configuration, change the destination target address of 10.2.2.2 to 10.1.1.1 on the R1 router, and the destination target address of 10.1.1.1 to 10.2.2.2 on the R2 router.Answer: BE 9. To have the best possible voice quality and to utilize effectively the available bandwidth, which queuing and compression mechanisms need to be used? (Choose two.)Select 2 response(s).A. class-based weighted fair queuing (CBWFQ)B. low latency queuing (LLQ)C. priority queuing (PQ) or custom queuing (CQ)D. Real-Time Transport Protocol (RTP) header compressionE. TCP header compressionF. UDP header compressionAnswer: BD 10. Which three statements about end-to-end delay are true? (Choose three.)Select 3 response(s).A. End-to-end delay is the sum of propagation delays, processing delays, serialization delays, and queuing delays.B. Coast-to-coast end-to-end delay over an optical link is about 20 ms.C. Processing delay depends on various factors, which include CPU speed, CPU utilization, IP switching mode, and router architecture.D. Propagation and serialization delays are related to the media.E. Propagation delay is the time it takes to transmit a packet and is measured in bits-per-second (bps).F. Serialization delay is the time it takes for a router to take the packet from an input interface and put it into the output queue of the output interface.Answer: ACD

Categories : 642-845, ccnp