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### 一、名词解释(一个2分,共10分) | ||
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协议 | ||
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ADSL | ||
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DNS | ||
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RIP | ||
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P2P | ||
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### 二、选择题(一个1分,共10分) | ||
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* 二进制指数后退(随机等待0~2^(n-1)个“tao”) | ||
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* TCP慢启动拥塞窗口大小(指数递增) | ||
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* Internet语音等多媒体用的什么协议-选的MPEG | ||
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* 子网掩码。给定子网掩码和特定网络,问该网络可以划分为多少个子网 | ||
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* 差错报文是什么协议-ICMP | ||
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* GBN协议的接收窗口大小-1 | ||
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* 网桥逆向学习-源端口 | ||
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* IP尽最大努力交付 | ||
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* DNS查询用的什么协议?-UDP | ||
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* 还有一个选择忘了。 | ||
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### 三、计算题(一个5分,共20分) | ||
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* 校验和 有错 | ||
* 距离矢量算法填表-书上原题 | ||
* GBN协议,发0-7号帧,发送方接收到0、3、4号帧的应答,问需要重发哪几个-5、6、7 | ||
* TCP慢启动+线性递增(书上那个图),初始拥塞窗口大小为1KB,发到16KB发生超时,此后又发了五次,前四次都在超时前有应答,问第五次发送时拥塞窗口大小?-9kB | ||
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### 四、论述题(一个10分,共40分) | ||
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* 2011年原题+少许改动;CSMA/CD+CSMA/CA | ||
* 还是某年原题,FTP等应用层协议采用了传输层哪个协议,为什么?-TCP | ||
* 让你设计网络层怎么设计(感觉是个比较开放的题) | ||
* 某单位有2个IP地址,如何实现用户通信(解决IP短缺,用NAT实现私有IP与公有IP的映射) | ||
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### 五、综合题(20分) | ||
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* 祖传题,历年祖传,今年有所改动,改动为: | ||
* 问的是TCP段长 | ||
* 加了个第六问,问TCP分片为什么1460(貌似有MTU) | ||
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* 往年题很多,一定要仔细看 | ||
* 计网不会太搞心态,往年题YYDS |
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