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    188宝金博页面版: 计算机网络原理（双语）C答案

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    内容提示： C 卷答案 一、A A C C D C B C C B 二、T F F T T T T F T F 三、 1、 Ethernet is a popular CSMA/CD protocol. Explain how it works. Solution: A station first senses the wire to see whether it is free. If there is currently no other activity, the station will start transmitting its data while it continues to listen. If a collision is detected, transmission stops immediately and a next attempt is made some random period later determined by an exponential backoff algorithm. 2 、 What is th...

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    C 卷答案 一、A A C C D C B C C B 二、T F F T T T T F T F 三、 1、 Ethernet is a popular CSMA/CD protocol. Explain how it works. Solution: A station first senses the wire to see whether it is free. If there is currently no other activity, the station will start transmitting its data while it continues to listen. If a collision is detected, transmission stops immediately and a next attempt is made some random period later determined by an exponential backoff algorithm. 2 、 What is the difference between a switch and a router? What effect does this have on the number of times they must forward a message. Solution: A switch is layer 2, a router is layer 3. A switch builds its switch table by eavesdropping on packets. Thus, the switch plugs and plays but will need to forward a messages to all output links if it has not heard from the destination node. A router builds its routing table through routing algorithms (eg. distance vector or link state). Thus, a router can forward a message to almost any host by sending only a single message. 3 、 What is the purpose of ARP? Describe how ARP works. Solution: The purpose of ARP is to resolve IP addresses to MAC addresses within a subnet. ARP uses MAC-level broadcast where only the host with the matching IP address responds to the host sending the ARP. From this response, the sending host can learn the MAC address of the responding host. 4 、 What is performance? Give at least three performance measures of interest for computer networks. Solution: A quantitative measurement of a system. Delay, throughput, loss (also resource consumption, utilization, reliability, availability). 5 、 What is the difference between a network service and a network protocol? Is it possible to have different implementations of the same protocol? Solution: A service describes what the network offers to its clients by means of an interface. A protocol is a set of rules describing exactly how that service is to be realized through the exchange of messages between computers. These rules may be implemented differently (e.g., using different programming languages), as long as those implementations coincide with the rules. 四、 1 、 Calculate how long it takes to send a 1Mb file over a 1.5Mbps link (1) a circuit switched network that uses 24 different frequency slots and a 500msec connection

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