默认题库 - CCNP(642-845)

多选题

Which three benefits are realized by implementing Wireless LAN Solution Engine （WLSE）？（）

A. improved WLAN security
B. simplified AP deployment
C. dynamic RF management
D. on-demand location of rogue APs
E. system-wide control of status and alarm monitoring
F. automatic channel and power level adjustment

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多选题

What are the three elements of configuring congestion management？（）

A. queue creation
B. determining packet drop thresholds
C. determining the random early detection method
D. traffic classification
E. queue scheduling
FIFO configuratio

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多选题

Which two statements about the WLAN Solution Engine （WLSE） are true？（）

A. WLSE supports centralized configuration.
B. WLSE supports distributed configuration.
C. WLSE can pick up statistics on a device even if the device is not properly configured.
D. WLSE can be used to upgrade the firmware on APs and bridges.
E. WLSE monitors device fault and performance conditions but cannot report any policy misconfiguratio

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多选题

What are two benefits of control plane policing？（）

A. protection against denial of service （DoS） attacks at infrastructure routers and switches
B. protection against known worm attacks in routers and switches
C. quality of service （QoS） control for packets that are sourced from the data plane of Cisco routers and switches
D. quality of service control （QoS） for packets that are destined to the control plane of Cisco routers and switches
E. quality of service （QoS） control for packets that are destined to the data plane of Cisco routers and switche

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多选题

Which three statements are true about the data traffic characteristics of voice traffic？（）

A. latency must be kept below 150 ms
B. latency is not a concern as long as jitter is kept below 30 ms
C. voice packets do not require a specific type of queuing
D. voice packets are rather small
E. voice packets require TCP for rapid retransmission of dropped packets
F. voice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload

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多选题

Which two statements describe traffic policing？（）

A. Traffic bursts are smoothed out by queuing the excess traffic to produce a steadier flow of data
B. Excess traffic is buffered so that the traffic remains within the desired rate.
C. Packets that conform to traffic policies are not delayed.
D. Packet marking is available and allows excess packets to be re-marked with a lower priorit

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多选题

Which two statements about the implementation of WLAN QoS are true？（）

A. The 802.11e standard is the IEEE 802.11 OoS WLAN standard.
B. The Wi-Fi Multimedia （WMM） standard decreases the eight priority levels to four access categories.
C. The Wi-Fi Multimedia （WMM） standard is a Wi-Fi Alliance standard that increases the four priority levels to eight access categories.
D. The Wi-Fi Multimedia （WMM） standard is an IEEE standard that increases the four priority levels to eight access categories.
E. Wireless 802.11 deploys Distributed Coordination Function （DCF）， carrier sense multiple access with collision detection （CSMA/CD）， interframe spacing， and random wait timers to avoid collisions.
F. Wireless OoS designs and implementations commonly use Layer 3 differentiated services code point （DSCP） or Layer 2 802.1 p to ensure priority

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多选题

In the design of a QoS solution， which two factors should be taken into consideration？（）

A. On congested links， all forms of traffic will require some form of Qo
B. All traffic types and requirements should be examined to determine the number of traffic classes required.
C. In the implementation of link efficiency mechanisms on links that typically transport relatively large packets， header compression will be most efficient.
D. In the implementation of link efficiency mechanisms on links that typically transport relatively small packets， header compression will be most efficient.
E. In the implementation of link efficiency mechanisms on links that typically transport relatively small packets， payload compression will be most efficient.
F. Payload compression provides more available bandwidth and reduces processing delay time.

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单选题

Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）

A. CAC is used to allocate enough bandwidth for the number of calls that are allowed on the VoIP network.
B. CAC is used to protect the quality of the voice calls by preventing call establishment if enough resources are not available on the network.
CAC provides queuing mechanisms for voice calls if the packets exceed the configured or budgeted rate.
D. In a VoIP network the CAC can be replaced with the LLQ QoS mechanism if it has been properly implemented.

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单选题

Which statement best describes the application of link fragmentation and interleaving （LFI）？（）

A. It compresses the Layer 2 payload and marks the packet as a high priority to be transmitted first
B. It fragments larger packets and allows VoIP packets to be transmitted in between them.
C. It stops the transmission of large packets when priority packets arrive.
D. It sends high priority packets in between normal traffic packets.

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Which three benefits are realized by implementing Wireless LAN Solution Engine （WLSE）？（）

What are the three elements of configuring congestion management？（）

Which two statements about the WLAN Solution Engine （WLSE） are true？（）

What are two benefits of control plane policing？（）

Which three statements are true about the data traffic characteristics of voice traffic？ （）

Which two statements describe traffic policing？（）

Which two statements about the implementation of WLAN QoS are true？（）

In the design of a QoS solution， which two factors should be taken into consideration？（）

Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）

Which statement best describes the application of link fragmentation and interleaving （LFI）？（）

Which three statements are true about the data traffic characteristics of voice traffic？（）