名词解释题Queuing delay编队延迟
名词解释题
Queuing delay编队延迟
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● Serialization delay and （71） delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the （72） on the wire, and queuing delay (depth of the queue) are improved by increasing the （73） from a 128Kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （74） in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the （75） of the application will only result in an increased bandwidth with no positive effects on performance.
Serialization delay and(71)delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the(72)on the wire, and queuing delay(depth of the queue)are improved by increasing the(73)from a 128Kbps circuit to a THowever, three other components of delay, routing/switching deiay, distance delay, and protocol delay are components that can not be positively affected by an(74)in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the(75)of the application will only result in an increased bandwidth with no positive effects on performance.A．bufferingB．queuingC．receivingD．timing
网络的延迟（delay）定义了网络把数据从一个网络节点传送到另一个网络节点所需要的时间。网络延迟包括（）。A、传播延迟（propagation delay）B、交换延迟（switching delay）C、介质访问延迟（access delay）D、队列延迟（queuing delay）
OLT通过Ranging测距过程获取ONU的往返延迟RTD（Round Trip Delay），从而指定合适的均衡延时参数EqD（Equalization Delay），保证每个ONU发送数据时不会在分光器上产生冲突。
OLT通过（）获取ONU的往返延迟RTD（Round Trip Delay），从而指定合适的均衡延时参数EqD（Equalization Delay），保证每个ONU发送数据时不会在分光器上产生冲突。
Which two statements about queuing mechanisms are true？ （）A、FIFO queuing is only appropriate for slower serial interfacesB、weighted fair queuing is the default queuing mechanism used for all but slower than E1 rate interfacesC、only one queuing mechanism type can be applied to an interfaceD、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
Which two queuing methods will allow a percentage of the available bandwidth to be allocated to each queue？（）A、first-in， first-out queuing （FIFO）B、priority queuing （PQ）C、custom queuing （CQ）D、weighted fair queuing （WFQ）E、class-based WFQ （CBWFQ）F、low latency queuing （LLQ）
What are two ways to minimize the delay of VoIP packets that are traversing a network？（）A、Use WFQ， CBWFO， and LLO to prioritize delay-sensitive packetsB、Use WFO， CBWFO， and LLO to compress the payload.C、Give TCP packets priority over UDP packets.D、Use control plane policing for cRTP queuing.E、Use stacker and predictor to compress the payload.
To have the best possible voice quality and to utilize effectively the available bandwidth， which queuing and compression mechanisms need to be used？（）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 compression
网络的延迟（delay）定义了网络把数据从一个网络节点传送到另一个网络节点所需要的时间网络延迟包括（）A、传播延迟（propagationdelay）B、交换延迟（switchingdelay）C、介质访问延迟（accessdelay）D、队列延迟（queuingdelay）
关于过渡动画的延迟效果，设置正确的是（）。A、transition-delay：none；B、transition-delay：0.3s；C、transition-delay：-1s；D、transition-delay：500ms；
设置主接口由Up转Down后延迟30秒切换到备份接口，主接口由Down转Up后60秒钟切换回主接口的配置为（）A、backup 30 60B、backup delay 30 60C、backup delay 60 30D、backup delay enable-delay 30 disable-delay 60
OLT通过（）获取ONU的往返延迟RTD（Round Trip Delay），从而指定 合适的均衡延时参数EqD（Equalization Delay），保证每个ONU发送数据时不会在分光器上产生冲突。A、测距技术B、光模块突发控制B、AES加密D、动态带宽分配
Which three statements about end-to-end delay are true？（）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.
SDM creates a low latency queuing （LLQ） service policy with its associated classes. What are the two types of low latency queuing available using the SDM QoS wizard？（）A、 FIFO queuing， which provides a means to hold packets while they are waiting to exit an interfaceB、 Priority queuing， which ensures a fixed amount of bandwidthC、 Custom queuing （CQ）， which provides a queuing tool that services all queues， even during times of congestionD、 Bandwidth queuing， which ensures a minimum amount of bandwidthE、 Weighted fair queuing （WFQ）， which classifies packets based on flows
What are two ways to minimize the delay of VoIP packets that are traversing a network？ （）A、 Use WFQ， CBWFQ， and LLQ to prioritize delay-sensitive packets.B、 Use WFQ， CBWFQ， and LLQ to compress the payload.C、 Give TCP packets priority over UDP packets.D、 Use control plane policing for cRTP queuing.E、 Use stacker and predictor to compress the payload.
设置主接口由Up转Down后延迟30秒切换到备份接口，主接口由Down转Up后60秒钟切换回主接口的配置为（）A、backup 3060B、backup delay3060C、backup delay6030D、backup delay enable-delay 30 disable-delay 60
单选题设置主接口由up转down后延迟30秒切换到备份接口，主接口由down转up后60秒钟切换回主接口的配置为（）。Astandby timer 30 60Bstandby timer 60 30Cstandby timer enable-delay 60 disable-delay 30Dstandby timer enable-delay 30 disable-delay 60
多选题To have the best possible voice quality and to utilize effectively the available bandwidth， which queuing and compression mechanisms need to be used？（）Aclass-based weighted fair queuing （CBWFQ）Blow latency queuing （LLQ）Cpriority queuing （PQ） or custom queuing （CQ）DReal-Time Transport Protocol （RTP） header compressionETCP header compressionFUDP header compression
多选题Which two statements about queuing mechanisms are true？ （）AFIFO queuing is only appropriate for slower serial interfacesBweighted fair queuing is the default queuing mechanism used for all but slower than E1 rate interfacesConly one queuing mechanism type can be applied to an interfaceDweighted fair queuing does not require the configuration of access lists to classify trafficEflow-based weighted fair queuing provides for queues to be serviced in a round-robin fashion
多选题Which two queuing methods will allow a percentage of the available bandwidth to be allocated to each queue？（）Afirst-in， first-out queuing （FIFO）Bpriority queuing （PQ）Ccustom queuing （CQ）Dweighted fair queuing （WFQ）Eclass-based WFQ （CBWFQ）Flow latency queuing （LLQ）