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add: 计网
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J1aM1ng committed Jan 8, 2022
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1 change: 1 addition & 0 deletions README.md
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* [操作系统](./操作系统OS)
* [计算机系统原理](./计算机系统原理)
* [计算机组成与设计](./计算机组成与设计)
* [计算机网络](./计算机网络)
* [计算机图形学](./计算机图形学)
* [马克思主义基本原理概论](./马克思主义基本原理概论)
* [毛泽东思想与中国特色社会主义概论](./毛泽东思想与中国特色社会主义概论)
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60 changes: 60 additions & 0 deletions 计算机网络/2020-2021第二学期计网考试回忆版.md
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### 一、名词解释(一个2分,共10分)

协议

ADSL

DNS

RIP

P2P



### 二、选择题(一个1分,共10分)

* 二进制指数后退(随机等待0~2^(n-1)个“tao”)

* TCP慢启动拥塞窗口大小(指数递增)

* Internet语音等多媒体用的什么协议-选的MPEG

* 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

* 差错报文是什么协议-ICMP

* GBN协议的接收窗口大小-1

* 网桥逆向学习-源端口

* IP尽最大努力交付

* DNS查询用的什么协议?-UDP

* 还有一个选择忘了。



### 三、计算题(一个5分,共20分)

* 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

### 四、论述题(一个10分,共40分)

* 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)

### 五、综合题(20分)

* 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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