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QUESTION 50
What are three benefits of using MQC for QoS configuration?
A. It allows the same QoS policy to be applied to multiple interfaces.
B. It provides support for up to 64 different class maps.
C. It allows any supported classification mechanism to be used with any QoS mechanism.
D. It allow for extensive marking capabilities to be applied to any service policy. PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
E. Classification is configured independently from the service policy.
Correct Answer: ACE Section: (none) Explanation
Explanation/Reference:
QUESTION 51
Which 3 options may be used on Cisco Catalyst switches for classifying IP Packets? (Choose 3)
A. 802.1Q
B. ISL CoS
C. Priority
D. MED
E. 802.1E
Correct Answer: ABC Section: (none) Explanation
Explanation/Reference:
QUESTION 52
Which three QoS markers can be set using class-based marking? (Choose three.)
A. discard-threshold
B. qos-group
C. mpls exp bits
D. cos
E. becn
F. fecn
Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
QUESTION 53
Based on Cisco’s best practice recommendation, where should classification and marking be applied in a network?
A. in the core
B. at the access layer
C. at the distribution layer
D. as close to the source as possible
E. as close to the desalination as possible
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 54
You work as a network administrator at PassGuide .com. You are required to implement prioritizing, protection, and isolation of traffic based on marking. Which mechanism should you deploy?
A. classification and marking
B. congestion management
C. congestion avoidance
D. metering
E. policing F. shaping
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 55
When RED is used as a dropping mechanism to avoid a full queue, which problem is exhibited if the minimum threshold and the maximum threshold are too close in size?
A. Queues fill and tail-drop drops packets.
B. The mark probability denominator is set to zero. PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
C. The default average queue size is rest to 512 packets.
D. TCP global synchronization can occur.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 56
Which Cisco IOS feature must be enabled before configuring class-based marking?
A. FEC
B. netflow
C. CEF
D. QBBP
E. Tcp small-server
F. ip classless
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 57
When queue on the Catalyst 2950 can be configured as the expedite queue?
A. queue 1
B. queue 2
C. queue 3
D. queue 4
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 58
DRAG DROP
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 59
Which three prerequisites must be met before using AutoQoS? (Choose three.)
PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
A. Cisco Express forwarding (CEF) must be enabled at the interface or ATM PVC.
B. Preconfigured policy maps must exist for AutoQoS to operate correctly.
C. AutoQoS cannot be configured if a service policy is attached to an interface.
D. The no ip address command is required for all interfaces or subinterfaces with link speeds less than 768 kbps.
E. On all interfaces or subinterfaces, the correct bandwidth should be configured with the bandwidth command.
Correct Answer: ACE Section: (none) Explanation
Explanation/Reference:
QUESTION 60
What are the three primary challenges when dealing with a converged network that QoS can help solve? (Choose three.)
A. delay
B. packet loss
C. server congestion
D. lack of bandwidth
E. port overutilization
Correct Answer: ABD Section: (none) Explanation
Explanation/Reference:
QUESTION 61
Configuration: Policy-map shape-cbwfq Class interactive Shape average 256000 Shape adaptive 128000 Bandwidth 128 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.
Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
QUESTION 62
Given the router configuration: interface Ethernet 0 ip address 10.1.1.1 255.255.255.0 ip policy-map set-prec ! route-map set-prec permit 10 match ip address 101 set ip precedence 1 ! route-map set-prec permit 20 set ip precedence 0 ! access-list 101 permit tcp any any eq telnet ! According the configuration illustrated above which of the following statements is valid?
A. All telnet packets from the Ethernet 0 interface are marked with IP precedence 0.
B. All packets sourced locally by the router that goes out on the Ethernet 0 interface are marked with IP precedence 1.
C. All non-telnet traffic from the Ethernet 0 interface is marked with IP precedence 0.
D. All telnet packets sourced locally by the router that goes out on the Ethernet 0 interface are marked with IP precedence 1.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 63
What is the result of properly configured Priority Queuing on Cisco IOS routers?
A. A starvation condition can occur where lower priority queues are never serviced.
B. Priority Queuing overhead can be too taxing on slow WAN links and might result in buffer exhaustion.
C. By default, unclassified packets are placed into the high priority output queue, which can affect high priority traffic.
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PassGuide 642-642
D. The high priority queue has a default queue limit of 80, that can result in excessive packet loss.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 64
What is the default match strategy for a class map?
A. match none
B. match any
C. match some
D. match all
E. match one
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 65
Which one of the following configurations provides a maximum bandwidth guarantee of 192 kbps for the real-time traffic class?
A. class real-time bandwidth 192
B. class real-time Priority 192
C. class real-time Shape peak 192000
D. class real-time Shape average 192000
E. class real-time police 192000 conform-action transmit exceed-action drop
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 66
The Tx Ring always uses which queuing method?
A. PQ
B. CQ
C. DRR
D. FIFO
E. WFQ
F. CBWFQ
Correct Answer: D Section: (none) Explanation Explanation/Reference:
QUESTION 67
Modified Deficit Round Robin (MDRR) service algorithm is capable of supporting which of the following operating modes? (Choose all that apply.)
A. FIFO
B. weighted priority
C. strict priority
D. shared priority
E. alternate priority
Correct Answer: CE Section: (none) Explanation
Explanation/Reference:
QUESTION 68
Which two procedures are required to configure AutoQoS on a Cisco router? (choose two)
A. Enable CEF globally
B. Configure map-class for AF traffic
C. Configure service-class for voice
D. Set the clock rate on the interface
E. Set the bandwidth statement on the interface PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
Correct Answer: AE Section: (none) Explanation
Explanation/Reference:
QUESTION 69
Which command is used to configure DSCP-based CB-WRED on an interface?
A. weighted-random dscp-based
B. random-queue dscp
C. random-detect dscp-based
D. weighted-queue dscp
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 70
Within CBWFQ, what is the default dropping scheme used when a CBWFQ class queue reaches its configured queue limit?
A. WRR
B. tail drop
C. WRED
D. RED
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 71
Which queuing method solves the problems created by inaccuate round-robin byte counting?
A. PQ
B. DRR
C. FIFO
D. MWRR
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 72
Which of the following statements represents a disadvantage of FIFO queuing?
A. FIFO queuing produces excessive jitter.
B. FIFO queuing supports packets of queue size of 40 exclusively.
C. FIFO queuing can only support packet classification based upon traffic flows.
D. FIFOI queuing is only available on interfaces that operate at 2 Mbps or higher.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 73
The newly appointed PassGuide trainee technician wants to know what services are provided through Committed Access Rate (CAR). What will your reply be? (Choose all that apply.)
A. Link efficiency
B. Traffic shaping
C. Policing
D. Classification
E. Weighted Random Early Discard (WRED)
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 74
Which of the following are shaping characteristics, but not policing characteristics? (Choose all that apply.)
A. It forces TCP resends PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
B. It is rate limiting with no buffering mechanism
C. It can adapt to Frame Relay BECN and FECN
D. It is most typically performed on egress
E. None of the above.
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 75
Which of the following statements regarding the capabilities of CAR is valid? (Choose all that apply.)
A. It is capable of supporting both policing and shaping options.
B. It allows a conform, exceed and violate action.
C. It allows cascading rate policies, in order to allow for more granular rate limits.
D. It can be used as both input and output policer.
E. It can be applied to serial interfaces, as well as ATM and Frame Relay interfaces.
Correct Answer: CDE Section: (none) Explanation
Explanation/Reference:
QUESTION 76
Shaping is the process whereby traffic flow is examined and rates are measured. What is done to packets during the shaping process when it exceeds a threshold bit rate?
A. Packets are delayed (queued)
B. Packets are discarded
C. Packets that exceed a defined burst size as well, are delayed (queued)
D. Packets that exceed a defined burst size as well, are discarded
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 77
Per-Virtual Circuit (VC) congestion avoidance discard at Layer 2 has what consequence when the ingress ATM interface discards a fragment?
A. Incomplete data packets are sent and the entire data packet must be resent.
B. The entire data packet is discarded at the ingress interface and must be resent.
C. Incomplete data packets are sent and discarded packet fragments must be resent.
D. Data packets may be sent in cells that are out of order, causing the entire packet to be resent.
Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
QUESTION 78
What are three capabilities of the route map used in policy-based routing? (Choose three)
A. Rate limiting
B. Packet marking
C. Packet classification
D. Intelligent packet discard
E. Defining customized routing paths
Correct Answer: BCE Section: (none) Explanation
Explanation/Reference:
QUESTION 79
What are two services provided through Committed Access Rate (CAR)? (Choose two)
A. Policing
B. Classification
C. Link efficiency
D. Traffic shaping PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
E. Congestion avoidance
Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
QUESTION 80
Which of the following statements regarding class maps is valid? (Choose all that apply.)
A. It is possible to configure a class map within another class map.
B. Match commands are used to specify packet classification.
C. The default behavior is match-any regardless whether match-any or match-all is specified or not.
D. Traffic that does not have a match in the class map is placed in the default class.
Correct Answer: ABD Section: (none) Explanation
Explanation/Reference:
QUESTION 81
Study the Exhibit below carefully: interface s0/0 custom-queue-list 5 ! queue-list 5 protocol ip 1 list 101 queue-list 5 queue 1 limit 40 queue-list 5 lowest-custom 2 queue-list 5 interface e0/0 2 queue-list 5 queue 2 byte-count 5000 queue-list 5 protocol ip 3 queue-list 5 queue 3 byte-count 5000 queue-list 5 queue 4 default ! access-list 101 permit ip any any precedence 5 According to the configuration in the exhibit, which
queue is used for traffic from e0/0 with a precedence of five?
A. 1
B. 2
C. 3
D. 4
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 82
Which of the following statements regarding the way in which Priority Queuing services its queues is valid?
A. The highest priority queue containing packets is serviced until it is empty.
B. The highest priority queue is always serviced first. The remaining queues are serviced in a TDM fashion.
C. A high priority queue is serviced until it is empty, only then will the service engine move to the next highest priority queue in a round-robin fashion.
D. The highest priority queue is allocated 50% of the available bandwidth. Each remaining queue is allocated half of the remaining bandwidth.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 83
What is the default scheduling mechanism that Custom Queuing uses?
A. FIFO
B. top down
C. round robin
D. weighted
E. none of the above
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 84
Exhibit:
PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642 Based on the configuration, which two of the following statements are true? (choose two)
A. This configuration will use a single token buket
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
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 85
What are three key differences between Weighted Fair Queuing (WFQ) and distributed Weighted Fair Queuing (dWFQ)? (Choose three)
A. dWFQ distributes its queuing policy to its neighbor.
B. dWFQ requires a Versatile interface Processor (VIP) to operate.
C. dWFQ adds WFQ support on ATM, Fast EtherChannel, and tunnel interfaces.
D. dWFQ supports classed-based weighting based on TOS field and QoS Group settings.
E. In order to use dWFQ, distributed Cisco Express Forwarding (dCEF) must be enabled on the interface.
Correct Answer: BDE Section: (none) Explanation
Explanation/Reference:
QUESTION 86
When configuring Priority Queuing on Cisco IOS routers, which three steps are required? (Choose three)
A. Define the priority list.
B. Configure an ACL for traffic identification.
C. Assign packets to specific priority queues.
D. Specify the maximum size of the priority queues.
E. Assign the priority list to be a designated router interface.
Correct Answer: ACE Section: (none) Explanation
Explanation/Reference:
QUESTION 87
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 staring out the low-volums flows with small packet size.
F. Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full
Correct Answer: AE Section: (none) Explanation
Explanation/Reference:
QUESTION 88
Which two statements are true about the DSCP field in an IP header? (Choose two)
PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
A. DSCP is the most significant six bits of the DS field
B. DSCP is the least significant six bits of the DS field
C. DSCP is used to select the type of service (ToS)
D. DSCP is used to select a per-hop behaviour (PHB)
E. DSCP is broken into four sub0fields
F. DSCP is broker into five sub-fields
Correct Answer: AD Section: (none) Explanation
Explanation/Reference:
QUESTION 89
Study the Exhibit below carefully: interface s0/0 bandwidth 128 ip address 10.0.0.1 255.255.255.252 encapsulation ppp fair-queue ip rtp priority 16384 16383 50 According to the configuration in the exhibit, what is the amount of bandwidth available to the fair queues?
A. 46 Kbps
B. 50 Kbps
C. 65 Kbps
D. 78 Kbps
E. 128 Kbps
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 90
Disregarding fragment size, which of the following LFI mechanism never fragments voice frames?
A. FRF .3
B. FRF.9
C. FRF.11 Annex C
D. FRF.6
E. FRF .12
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 91
Which of the following statements regarding cRTP compression is valid?
A. IP, TCP, and RTP headers are compressed, since the headers are uncompressed on the other end of the link.
B. UDP and RTP headers are compressed, but the IP header is not, so the VoIP packets can be delivered to the terminating gateway.
C. IP, UDP, and RTP headers are compressed, since the headers are uncompressed on the other end of the link.
D. TCP and RTP headers are actually removed, with a smaller header added that includes information that has changed since the last full header sent.
E. None of the above.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 92
You are the network administrator at PassGuide . The newly appointed PassGuide trainee wants to know what the approximate bandwidths required for a G.729a VoIP call with and without cRTP enabled is. What will your reply be?
A. 5.3 Kbps/8 Kbps
B. 11 Kbps/26 Kbps
C. 12 Kbps/24 Kbps
D. 28 Kbps/64 Kbps
E. none of the above. PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 93
Which packet will most likely be dropped by Weighted Fair Queuing (WFQ) during periods of traffic congestion?
A. The newest packet.
B. The packet with the worst finish time.
C. The largest packet.
D. The packet with the lowest priority.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 94
The newly appointed PassGuide trainee technician wants to know what is the reason why Weighted Fair Queuing (WFQ) is disabled on WAN interfaces using X.25, SDLC, LAPB, or reliable PPP encapsulations. What will your reply be?
A. These protocols require strict priority scheduling which is not WFQ is not capable of supporting.
B. These encapsulations require sequenced packets which is contradictory to the way in which WFQ works.
C. Each of these protocols has a pre-defined compulsory queuing scheme.
D. These protocols require delay characteristics which WFQ-enabled routers are incapable of.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 95
Which of the following statements aptly describes what the result of enabling Weighted Fair Queuing (WFQ) on a low-speed router interface is?
A. Bandwidth is guaranteed for different traffic queues.
B. Delay is guaranteed for high-priority traffic types.
C. Fixed-size queues are pre-allocated for different traffic flows.
D. Low-bandwidth traffic receives priority over high-bandwidth traffic.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 96
Under which circumstances will Cisco IOS bypass the transmit software queue on an interface and place the packet directly into the hardware queue?
A. When LLQ has been enabled.
B. When the software queue is full.
C. When the software queue is empty.
D. When the software queue has reached its MCC.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 97
Which of the following statements regarding the queuing scheme of IP Real Time Transport Protocol (RTP) prioritization is valid?
A. It is capable ofsupporting TCP traffic.
B. It is used mainly for interactive traffic.
C. It is responsible for providing low latency queuing by providing a high priority queue.
D. Packets that exceed the queue’s configured rate are placed into the default queue.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 642-642
QUESTION 98
Which of the following are versions of distributed WFQ (dWFQ)? (Choose all that apply.)
A. CAR-based dWFQ
B. QPPB-based dWFQ
C. flow-based dWFQ
D. ToS-based dWFQ
E. DiffServ-based dWFQ
F. precedence-based dWFQ
Correct Answer: CD Section: (none) Explanation
Explanation/Reference:
QUESTION 99
The newly appointed PassGuide trainee technician wants to know what the difference is between Low
Latency Queuing (LLQ) and IP Real-Time Transport Protocol (RTP) priority.
What will your reply be?
A. LLQ is not limited to defining traffic flows when making use of UDP port numbers.
B. IP RTP Priority has the ability to specify traffic matches based on DSCP whereas LLQ cannot.
C. LLQ can accommodate voice traffic that is not supported in IP RTP Priority configurations.
D. LLQ priority queues suffer from “starvation” of low priority traffic due to preferential treatment of the high priority queue.
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 100
Which of the following represent important advantages of applying QoS to IP networks? (Choose all that apply.)
A. QoS manages packet loss during periods of bursty congestion.
B. QoS facilitates the integration of differing traffic types such as voice, video, and data into a single infrastructure.
C. QoS is capable of preoviding performance enhancements for commercial application issues such as server sizing and tuning.
D. QoS allows the control usage patterns of network applications.
E. QoS is capable of solving traffic problems on low bandwidth, high-latency, high-loss WAN links.
Correct Answer: ABE Section: (none) Explanation
Explanation/Reference:
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