题目内容
流量控制和拥塞控制一样，是一个全局过程，都涉及到网络中所有的主机、路由器，以及与降低网络传输性能有关的因素。
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UDP协议是无连接的，使用尽最大努力交付，即不保证可靠交付，是面向报文的。
TCP 报文段首部字段中的数据偏移字段表示的是TCP 报文段的首部长度。
在某段时间，若对网络中某一资源的需求超过了该资源所能提供的可用部分，网络的性能就要变坏，这种情况就叫做拥塞(congestion)。TCP 进行拥塞控制的算法有四种，即慢开始(slow-start) 、拥塞避免(congestion avoidance)、快重传(fast retransmit)和快恢复(fast recovery)。
Directions:In the boxes below are some of the words and phrases you have learned in this unit. Choose the one that best completes the sentences.1.Once we've ___________, you must come round for dinner.2.The prime minister succeeded in ___________ the challenge to his authority.3.After he qualified as a doctor, his mother __________ him _________ in a practice of his own.4.I'd like you to _____________ that manoeuvre again and then bring the car to a halt.5.Although horses do not generally mind the cold, ______________ from rain and wind is important.6.He's never done this type of work before; I'm not sure how he'll _______________ the other people.7.The police ___________ the suspect's fingerprints with those found at the crime scene.8.The methods of communication used during the war were _________ by today's standards.9.He gets ______________ when people don't understand what he's trying to say.10.Thousands of people blocked the street, _________ against the new legislation.11.After working her way around the world, she __________ teaching English as a foreign language.12.He said all he ____________ was that I'd change my mind at the last moment like Rose Spencer.13.She ___________ angrily at everyone and stormed out of the room.14.When she lost her job they could no longer ___________ their expensive lifestyle.15.Many software companies have ____________ popular programs to the new operating system.16.Those harmful things may be in the name of love, but it must be other things similar to ___________ desire.
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