diff --git a/docs/courses/软件工程学院/计算机网络/computer_network_lab1.zip b/docs/courses/软件工程学院/计算机网络/computer_network_lab1.zip deleted file mode 100644 index 184300c..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/computer_network_lab1.zip and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000032800000154F3640027.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000032800000154F3640027.png deleted file mode 100644 index 403bb59..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000032800000154F3640027.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000032900000152B123680E.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000032900000152B123680E.png deleted file mode 100644 index aa7ab10..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000032900000152B123680E.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000003320000015C8A9E98EE.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000003320000015C8A9E98EE.png deleted file mode 100644 index b9bd396..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000003320000015C8A9E98EE.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000033300000151977B0DF0.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000033300000151977B0DF0.png deleted file mode 100644 index 70365f3..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000033300000151977B0DF0.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000004000000007864293250.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000004000000007864293250.png deleted file mode 100644 index e6743ea..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000004000000007864293250.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/1000000100000470000000F4B4E41AC7.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/1000000100000470000000F4B4E41AC7.png deleted file mode 100644 index d985765..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/1000000100000470000000F4B4E41AC7.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000004EE0000005E50C8B369.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000004EE0000005E50C8B369.png deleted file mode 100644 index e9b2e07..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/10000001000004EE0000005E50C8B369.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000094B000002EADEAFEA2E.png b/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000094B000002EADEAFEA2E.png deleted file mode 100644 index 5ebf16b..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/images/Pictures/100000010000094B000002EADEAFEA2E.png and /dev/null differ diff --git a/docs/courses/软件工程学院/计算机网络/lab1.md b/docs/courses/软件工程学院/计算机网络/lab1.md deleted file mode 100644 index d86977f..0000000 --- a/docs/courses/软件工程学院/计算机网络/lab1.md +++ /dev/null @@ -1,122 +0,0 @@ -**华东师范大学软件学院实验报告** - -**一、实验目的** - -1. 学会使用curl与wget指令 - -2. 学会通过Wireshark获取数据包 - -3. 了解协议层数据包的结构 - -4. 学会计算并分析协议开销 - -**二、实验内容与实验步骤** - -1. 在控制台中输入"curl http://1st.moe/"，并观察到"200 OK" - -2. 启动Wireshark，选择监听以太网，并将捕获过滤器设置为tcp port - > 80，关闭混杂模式，并启用"enable network name resolution"选项 - -3. 关闭所有浏览器窗口后开始捕获 - -4. 重新在控制台输入"curl [**http://1st.moe/**](http://1st.moe/)" - -5. 停止Wireshark捕获 - -**三、实验环境** - -> B226机房电脑 - -**四、实验过程与分析** - -1. 实验过程 - - 1) 捕获内容如图所示 - -> ![](./images/Pictures/100000010000094B000002EADEAFEA2E.png){width="17.007cm" -> height="5.3cm"} - -2. 1) 分析协议包的内容 - -> ![](./images/Pictures/10000001000003320000015C8A9E98EE.png){width="8.504cm" -> height="3.6cm"}![](./images/Pictures/100000010000032800000154F3640027.png){width="8.504cm" -> height="3.579cm"}![](./images/Pictures/100000010000032900000152B123680E.png){width="8.504cm" -> height="3.556cm"}![](./images/Pictures/100000010000033300000151977B0DF0.png){width="8.504cm" -> height="3.489cm"} - -> 根据如上四张图片，可以发现各个协议所占的字节数为 - -+---------------------------------------+-------------+ -| > 协议 | > 字节数 | -+---------------------------------------+-------------+ -| > Ethernet (eth) | > 14 bytes | -+---------------------------------------+-------------+ -| > Internet Protocol Version 6 (ipv6) | > 40 bytes | -+---------------------------------------+-------------+ -| > Transmission Control Protocol (tcp) | > 20 bytes | -+---------------------------------------+-------------+ -| > Hypertext Transfer Protocol (http) | > 128 bytes | -+---------------------------------------+-------------+ - -> 则包的结构大致如下 - -+-------------------+--------------------+------------+-------------+ -| > eth | > ip | > tcp | > http | -+-------------------+--------------------+------------+-------------+ -| > 14 bytes | > 40 bytes | > 20 bytes | > 128 bytes | -+-------------------+--------------------+------------+-------------+ -| > Ethernet Header | > Ethernet Payload | | | -+-------------------+--------------------+------------+-------------+ -| > IP Header | > IP Payload | | | -+-------------------+--------------------+------------+-------------+ - -3. 问题 - - 1) 分析协议开销 - -> 一个GET本身的大小为128 -> bytes，而其相应产生的SYN、ACK请求也应算入其开销中。根据图片 - -> ![](./images/Pictures/10000001000004EE0000005E50C8B369.png){width="17.096cm" -> height="1.281cm"} - -> 可以计算得出由于协议产生的总开销为86+74+(202-128)+74=308 -> bytes，从而计算得出比值约为0.4156，考虑到信息传输的稳定性，协议开销是值得的。 - -4. 1) 以太网头部中哪一部分是解复用键并且告知它的下一个高层指的是IP，在这一包内哪一个值可以表示IP - -> 根据图片 - -> ![](./images/Pictures/10000001000004000000007864293250.png){width="17.096cm" -> height="2.009cm"} - -> ![](./images/Pictures/1000000100000470000000F4B4E41AC7.png){width="17.096cm" -> height="3.667cm"} - -> 可以直观看出ipv6对应的分解键为0x86dd，tcp对应的分解键为6 - -5. 故障分析 - -> 在实验过程中出现了控制台有反馈但Wireshark没有捕获的情况，经排查后发现是由于控制台指令输入错误：误将http输入为https所致。 - -**五、实验结果总结** - -1. 实验完成了对一个HTTP包的拆解与分析，其大体结构大致如下 - -+-------------------+--------------------+------------+-------------+ -| > Eth | > ip | > tcp | > http | -+-------------------+--------------------+------------+-------------+ -| > 14 bytes | > 40 bytes | > 20 bytes | > 128 bytes | -+-------------------+--------------------+------------+-------------+ -| > Ethernet Header | > Ethernet Payload | | | -+-------------------+--------------------+------------+-------------+ -| > IP Header | > IP Payload | | | -+-------------------+--------------------+------------+-------------+ - -2. 实验通过curl指令与Wireshark软件完成，在其中熟悉网络工具的使用，并体会到其强大之处 - -3. 通过查询相关资料，了解开销、分解键等概念 - -**六、附录** - -**无** diff --git a/docs/courses/软件工程学院/计算机网络/计算机网络实验报告 Lab Protocal Layer.odt b/docs/courses/软件工程学院/计算机网络/计算机网络实验报告 Lab Protocal Layer.odt deleted file mode 100644 index dbdf210..0000000 Binary files a/docs/courses/软件工程学院/计算机网络/计算机网络实验报告 Lab Protocal Layer.odt and /dev/null differ