单选题How does weighted random early detection （WRED） prevent packet loss？（）A increases link capacityB increases buffer space to accommodate bursts of traffic from delay-sensitive applicationsC provides prioritized forwarding for drop-sensitive applicationsD

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单选题

How does weighted random early detection （WRED） prevent packet loss？（）

increases link capacity

increases buffer space to accommodate bursts of traffic from delay-sensitive applications

provides prioritized forwarding for drop-sensitive applications

drop lower priority packets before congestion occurs

separates traffic into as many as 64 queues that can be uniquely prioritized

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第1题：

Which of the following would allow an administrator to incorporate a new Windows service pack into an installation when the media does not include the service pack?()

A. Templates

B. RIS

C. Ghost

D. Slipstreaming

参考答案：D

第2题：

--How much did this set of furniturecost?
--I forgot__

A.how much it costs
B.how much did it cost
C.how much it cost
D.how much does it cost

答案：C

解析：

第3题：

____does Jane write to herparents? Once a week

A.How seldom

B.How often

C.How long

D.How soon

正确答案：B

第4题：

拥塞避免，是指通过监视网络资源（如队列或内存缓冲区）的使用情况，在拥塞有加剧的趋势时，主动丢弃报文，通过调整网络的流量来解除网络过载的一种流控机制，常见的丢弃策略有（）。

A、尾部丢弃（Tail-Drop）
B、WFQ的丢弃方式
C、RED（Random Early Detection）
D、WRED（Weighted Random Early Detection）

正确答案:A,B,C,D

第5题：

Which two statements about WRED are true？（）

A、WRED can selectively discard lower priority traffic when the interface becomes congested and can provide differentiated performance characteristics for different classes of service.
B、Resource Reservation Protocol （RSVP） and WRED cannot be configured on the same interface.
C、WRED will throttle back voice traffic only as a last resort.
D、If the average queue length is greater than the minimum threshold but less than the maximum threshold， then based on the drop probability， WRED will either queue the packet or perform a random drop.
E、WRED statistically drops more packets from low-bandwidth users than high-bandwidth users. Therefore， traffic sources that generate the least traffic are more likely to be slowed down than traffic sources that generate the most traffic.
F、 WRED treats non-IP traffic as precedence 4.

正确答案:A,D

第6题：

拥塞避免,是指通过监视网络资源(如队列或内存缓冲区)的使用情况,在拥塞有加剧的趋势时,主动丢弃报文,通过调整网络的流量来解除网络过载的一种流控机制,常见的丢弃策略有()。

A.尾部丢弃（Tail-Drop）

B.WFQ的丢弃方式

C.RED（Random Early Detection）

D.WRED（Weighted Random Early Detection）

参考答案：A, B, C, D

第7题：

Which two statements about queuing mechanisms are true？（）

A、FIFO queuing is only appropriate for slower serial interfaces
B、weighted fair queuing is the default queuing mechanism used for all but slower than E1 rate interfaces
C、only one queuing mechanism type can be applied to an interface
D、weighted fair queuing does not require the configuration of access lists to classify traffic
E、flow-based weighted fair queuing provides for queues to be serviced in a round-robin fashion

正确答案:C,D

第8题：

how does the rudder answer?

正确答案：The rudder answer well/ slowly./ No answer./sluggish.

第9题：

当需要用英语询问制作一道菜需要多长时间，你可以用（）。

A、How ofen do the course？
B、How about the flavour of this course？
C、How long does it preparefor dinner？
D、How long does it take to cook this course？

正确答案:D

第10题：

What are two QoS mechanisms that are used to prevent packet loss？（）

A、header compression
B、payload compression
C、low latency queuing （LLQ）
D、weighted random early detection （WRED）
E、traffic policing
F、traffic shaping

正确答案:C,D

How does weighted random early detection （WRED） prevent pack

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