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Slide 1: PassGuide 642-642 Cisco 642-642 Cisco® Quality of Service (QoS) Q&A Demo www.PassGuide.com (C) Copyright 2006-2009 CertBible Tech LTD,All Rights Reserved. PassGuide.com - Make You Succeed To Pass IT Exams
Slide 2: PassGuide 642-642 Important Note Please Read Carefully Study Tips This product will provide you questions and answers 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 120 days after the purchase. You should check your member zone at PassGuide an update 3-4 days before the scheduled exam date. Feedback If you spot a possible improvement then please let us know. We always interested in improving product quality. Feedback should be send to feedback@passguide.com. You should include the following: Exam number, version, page number, question number, and your login ID. Our experts will answer your mail promptly. Be Prepared. Be Confident. Get Certified. ------------------------------------------------------------------------------------------------------------------------Sales and Support Manager Sales Team: sales@passguide.com Support Team: support@passguide.com --------------------------------------------------------------------------------------------------------------------- Copyright Each pdf file contains a unique serial number associated with your particular name and contact information for security purposes. So if we find out that a particular pdf file is being distributed by you, CertBible reserves the right to take legal action against you according to the International Copyright Laws. PassGuide.com - Make You Succeed To Pass IT Exams
Slide 3: PassGuide 642-642 Question：1 What is the purpose of the qos pre-classify command? A. to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header B. to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header C. to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header D. to enable the IOS to classify the packet based on the outer tunnel IPheader instead of the original IP header E. to enable class-based marking on tunnel interface F. to enable class-based marking on IPSec crypto maps Answer:C Question：2 What are two benefits of WFQ? (Choose two.) A. WFQ is very easy to configure, and no manual traffic classification is necessary. B. WFQ can provide fixed-bandwidth and fixed-delay guarantees. C. WFQ can provide fixed-bandwidth guarantees. D. WFQ can provide fixed-delay guarantees. E. WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size. F. Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full. Answer:AE Question：3 Based on the configuration, which two of the following statements are true? (Choose two.) A. This configuration will use a single token bucket. B. This configuration will drop all exceeding traffic. C. This is a dual-rate, class-based policing example. D. This is a percentage-based policing example. E. This is a multi-action, class-based policing example. Answer:CD Question：4 Based on the configuration, which two statements are true? (Choose two.) A. The interactive traffic class will have a minimum bandwidth guarantee of 256 kbps. B. The interactive traffic class will have a maximum bandwidth guarantee of 256 kbps. C. If the interactive traffic class exceeds an average rate of 256 kbps, the traffic rate will be throttled down to 128 kbps. D. This configuration allows class-based traffic shaping to lower the traffic rate in response to the BECN bit. E. The interactive traffic class will have a min-rate (min-cir) of 128 kbps. Answer:DE Question：5 Which technology is required when configuring FRF.12 on a Cisco device? A. FRF11.c B. FRF.8 C. VoFR D. MLP with interleaving E. FRTS F. WRED Answer:E Question：6 What are three methods of reducing delay for critical applications in a converged network?(Choose three.) A. Apply payload compression. B. Increase link capacities. C. Apply header compression. PassGuide.com - Make You Succeed To Pass IT Exams
Slide 4: PassGuide 642-642 D. Increase LFI fragment size. E. Reduce inter-packet gaps. F. Increase all queue depths. Answer:ABC Question：7 At the network layer, IP packets are typically classified based on which three items? (Choose three.) A. packet length B. VLAN Identifier C. flow control bits D. source and destination IP addresses E. content of the ToS byte Answer:ADE Question：8 What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.) A. decrease delay B. decrease jitter C. increase link speed D. increase throughput E. decrease propagation delay Answer:ABD Question：9 Which mechanism is used for the prioritizing, protection, and isolation of traffic based on marking? A. classification and marking B. congestion management C. congestion avoidance D. metering E. policing F. shaping Answer:B PassGuide.com - Make You Succeed To Pass IT Exams