计算机网络教程自顶向下方法选择题及答案-Chapt-4-Network-Layer-QUIZZ.docx
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1、Chapter 4 Network Layer.Packetizing at the network layer involvesA) Encapsulating the payload at the sourceB) Adds a header that contains the source and destination informationC) Decapsulating the payload at the destinationD) All of the choices are correct2.Routers in the path are not allowed to.A)
2、fragment the packet they receiveB) decapsulate the packetC) change source or destination addressD) All of the choices are correctl l J VH/ ABCDThe network layer in the Internet provides. comprehensive error and flow control, limited error control, but no flow control, comprehensive error control but
3、 limited flow control. All of the choices are correct4.In a virtual-circuit approach, the forwarding decision is based on the value of the field in the packet header.a)b)qd)source addressdestination addresslabelNone of the choices are correct5.In a datagram approach, the forwarding decision is based
4、 on the value of the field inthe packet header.A)B)QD)source addressdestination addresslabelNone of the choices are correct6.The performance of a network can be measured in terms of.A)B)QD)delaythroughputpacket lossall of the choices are correct7.Transmission delay (time) is the ratio of.A) transmis
5、sion rate to packet lengthB) transmission rate to distanceC) packet length to transmission rateD) processing time to transmission rate8.l ) n IHf ABCDPropagation delay (time) is the ratio of. transmission rate to propagation speed propagation speed to distance packet length to propagation speed dist
6、ance to propagation speed9.When the load in the network reaches the network capacity, the packet delay and theA)B)QD)network throughput reaches. increases sharply; its minimum increases sharply; its maximum decreases sharply; its minimum decreases sharply; its maximum10.In open-loop congestion contr
7、ol, policies are applied.A) to prevent congestion before it happensB) to alleviate congestion after it happensC) to either prevent congestion before it happens or to alleviate congestion after it happensD) None of the choices are correct11.The technique is one of the open-loop congestion policyA) ba
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