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  3. 2011年11月网络工程师考试上午真题【基础知识】
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2011年11月网络工程师考试上午真题【基础知识】

【65】以下属于万兆以太网物理层标准的是(65)

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【66】ieee802.11采用了类似于802.3m协议,之所以不采用m协议的原因是(66)

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【67】无线局域网(wl)标准ieee802.llg规定的最大数据速率是(67)

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【68】大型局域网通常组织成分层结构(核心层、汇聚层和接入层),以下关于网络核心层的叙述中,正确的是(68)

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【69-70】网络设计过程包括逻辑网络设计和物理网络设计两个阶段,各个阶段都要产生相应的文档,以下选项中,(69)属于逻辑网络设计文档,(70)属于物理网络设计文档。

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【71-75】a transport layer protocol usually has several responsibilities .one is to createaprocess-to-process communication;UDP uses (71)numbers to accomplish this.another responsibilityisto provide control mechanisms at the transpt level.UDP does this task at a very minimallevel.thereis no flow control mechanism and there is no(72) for received packet. UDP,however ,does provideerrorcontrol to some extent.if UDP detects an error in the received packet,it will silentlydropit.thetransport layer also provides a connection mechanism for the processes.the(73)must be abletosendstreams of data to the transport layer.it is the responsibility of the transport layer at(74)stationto make the connection with the receiver.chop the stream into transportable units,numberthem,andsend them one by one.it is the responsibility of th transorort layer at the receivingendtowaituntil all the different units belong to th same process have arrived,check and passthosethatare(75) free ,and deliver them to the receiving process as a stream.

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