计算机网络自顶向下方法 第一章 Wireshark实验：入门 答案
https://github.com/jzplp/Computer-Network-A-Top-Down-Approach-Answer
Wireshark实验：入门
- 官方文档 第六版 第七版 第六版翻译
- Wireshark_Intro 实验答案
1. 列出上述步骤7中出现在未过滤的分组列表窗口的协议列中的3种不同的协议。
答案：
HTTP协议，TCP协议，DNS协议
2. 从HTTP GET消息发送到HTTP OK回复需要多长时间？
答案：
用了0.250858s
3. gaia.cs.umass.edu(也称为www.net.cs.umass.edu)的Internet地址是什么？您的计算机的Internet地址是什么？
答案：
gaia.cs.umass.edu的Internet地址是128.119.245.12
我的计算机的Internet地址是 49.52.10.72
4. 打印问题2提到的两个HTTP消息(GET和OK)。
答案：
GET消息：
No. Time Source Destination Protocol Length Info 310 14:16:35.846326 49.52.10.72 128.119.245.12 HTTP 359 GET /wireshark-labs/INTRO-wireshark-file1.html HTTP/1.1
Frame 310: 359 bytes on wire (2872 bits), 359 bytes captured (2872 bits) on interface 0 Ethernet II, Src: Dell_26:61:cc (50:9a:4c:26:61:cc), Dst: Cisco_f1:9d:c0 (58:97:bd:f1:9d:c0) Internet Protocol Version 4, Src: 49.52.10.72, Dst: 128.119.245.12 Transmission Control Protocol, Src Port: 65117, Dst Port: 80, Seq: 1, Ack: 1, Len: 305 Hypertext Transfer Protocol GET /wireshark-labs/INTRO-wireshark-file1.html HTTP/1.1\r\n Accept: text/html, application/xhtml+xml, image/jxr, /\r\n Accept-Language: zh-CN\r\n User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko\r\n Accept-Encoding: gzip, deflate\r\n Host: gaia.cs.umass.edu\r\n Connection: Keep-Alive\r\n \r\n [Full request URI: http://gaia.cs.umass.edu/wireshark-labs/INTRO-wireshark-file1.html] [HTTP request 1/1] [Response in frame: 316]
OK消息：
No. Time Source Destination Protocol Length Info 316 14:16:36.097184 128.119.245.12 49.52.10.72 HTTP 492 HTTP/1.1 200 OK (text/html)
Frame 316: 492 bytes on wire (3936 bits), 492 bytes captured (3936 bits) on interface 0 Ethernet II, Src: Cisco_f1:9d:c0 (58:97:bd:f1:9d:c0), Dst: Dell_26:61:cc (50:9a:4c:26:61:cc) Internet Protocol Version 4, Src: 128.119.245.12, Dst: 49.52.10.72 Transmission Control Protocol, Src Port: 80, Dst Port: 65117, Seq: 1, Ack: 306, Len: 438 Hypertext Transfer Protocol HTTP/1.1 200 OK\r\n Date: Mon, 22 Oct 2018 06:16:35 GMT\r\n Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/5.4.16 mod_perl/2.0.10 Perl/v5.16.3\r\n Last-Modified: Mon, 22 Oct 2018 05:59:01 GMT\r\n ETag: "51-578caf3246024"\r\n Accept-Ranges: bytes\r\n Content-Length: 81\r\n Keep-Alive: timeout=5, max=100\r\n Connection: Keep-Alive\r\n Content-Type: text/html; charset=UTF-8\r\n \r\n [HTTP response 1/1] [Time since request: 0.250858000 seconds] [Request in frame: 310] File Data: 81 bytes Line-based text data: text/html (3 lines) \n Congratulations! You've downloaded the first Wireshark lab file!\n \n