第三章 internet

# 第三章 internet --- 課程連結 board.idunit.online ---- ## 開始之前先說好 before we start ---- - workshop 需要的工具 - 筆電 ---- - workshop 會用到的線上工具 [hackmd](board.idunit.online) discord https://discord.gg/UdtEyq slido https://app.sli.do/event/pr46kr0u ---- - 現場資源 - wifi - 電源 ---- - 如果太累可以睡覺，但請不要打乎吵到其他人。 ---- - 如果覺得講太快請告訴我 ---- - 由於我們時間有限，我們無法涵蓋所有內容 ---- - 而是挑選幾個代表性的工具跟用法 ---- - 如果覺得內容有誤 - 或覺得講得可以更好歡迎來意見回饋 bootcamp 工作人員 ---- - 或你有更多想說 - 歡迎報名成為講師 ---- - Greeting I am jeffery - icafe - self-study to open source in security - teapook - London linux scholarship - consult ---- - shell basic last time ---- ### .net + powershell + chocolatey ---- - 接下來是 - OSI layer 1-4 TCP/IP - OSI layer 5-7 http - frontend domain - ssh forwarding ---- - 再來就是 - git workshop 9/5 --- web frontend backend need to know ---- internet basic structure OSI https://zh.wikipedia.org/zh-tw/OSI%E6%A8%A1%E5%9E%8B ![](https://cdn1.techbang.com/system/excerpt_images/15859/original/e832e43ce763c0faf46acd2b08c49531.jpg?1385627311 =400x) ---- [IETF](https://zh.wikipedia.org/wiki/%E4%BA%92%E8%81%94%E7%BD%91%E5%B7%A5%E7%A8%8B%E4%BB%BB%E5%8A%A1%E7%BB%84) 眾人合力的 [RFC(Request for Comments)](https://zh.wikipedia.org/zh-tw/RFC) 網路是眾人合力的成果 ---- layer 1 the hardware Broadcom cisco 通訊晶片廠 aruba asus 路由器廠 ---- layer 2 節點資料有沒有接起來 https://en.wikipedia.org/wiki/Data_link_layer ``` ppp pppoe arp -a ``` ---- mac https://en.wikipedia.org/wiki/Medium_access_control ---- layer 3 ICMP (Internet Control Message Protocol) ---- IP (Internet Protocal) https://en.wikipedia.org/wiki/Network_layer ---- reserved privated ip https://m.gamer.com.tw/home/creationDetail.php?sn=402247 ---- ``` ping traceroute ``` ---- layer 4 TCP UDP https://en.wikipedia.org/wiki/Transport_layer ![](https://preview.redd.it/duv11av99nm11.png?auto=webp&s=e911479f36d71ebe903030d45b66e5a68f686efd =400x) ---- TCP handshake ![](https://i.imgur.com/BQcseB1.png =400x) ---- port https://en.wikipedia.org/wiki/Port_(computer_networking) ---- 65535? ---- 0-65535 65535 + 1 =65536 2 ** 16 ---- nmap --- layer 5 - layer 7 ---- [What happens when...](https://github.com/alex/what-happens-when) ---- request and response ![](https://cdn.tutsplus.com/net/authors/jeremymcpeak/http1-request-response.png) ---- more user? ![](https://i.stack.imgur.com/wOfS8.png =500x) ---- [HTTP: The Protocol Every Web Developer Must Know ](https://code.tutsplus.com/tutorials/http-the-protocol-every-web-developer-must-know-part-1--net-31177) ---- URL ![](https://cdn.tutsplus.com/net/authors/jeremymcpeak/http1-url-structure.png) [API(Application Programming Interface)](https://zh.wikipedia.org/zh-hant/%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E6%8E%A5%E5%8F%A3) ---- http get https://developer.mozilla.org/zh-TW/docs/Web/HTTP/Methods ---- http status code https://developer.mozilla.org/en-US/docs/Web/HTTP/Status ---- restful api 1.Nouns 名詞：定義資源位置的 URL，每個資源在網路上都會有唯一的位置，就如每戶人家都有唯一的地址一樣。 2.Verbs 動詞：對資源要做的動作。 3.Content Types 資源呈現方式：API 資源可以以多種方式表現，最常用的是 JSON，較輕，也較好處理。 ---- ``` curl ``` ---- https://httpbin.org/ https://http.cat/ --- html css javascript ---- ``` wget ``` ---- wget 整包帶回家 https://www.moreofless.co.uk/download-website-wget-entire-html-css-js/ ---- crawler 爬蟲你以為你是資料工程師，有時候你其實是爬蟲工程師 ---- http header ---- js py ---- cookie and session ---- more reference ---- ![](https://images-na.ssl-images-amazon.com/images/I/51qvr+iNtML._SX376_BO1,204,203,200_.jpg =400x) ---- 鳥哥伺服器篇 --- domain [how dns works](https://howdns.works/) ---- ``` whois dig url nslookup ``` ---- TWNIC APNIC ---- SEO ---- google hacking ---- shodan --- ssh ---- remote login ---- to your own machine ---- play with others'? https://null-byte.wonderhowto.com/how-to/haunt-computer-with-ssh-0199625/ ---- vm ---- even mobile ---- port forwarding ---- NAT ifconfig iptable, router command ---- tunneling https://newtoypia.blogspot.com/2020/05/ssh-tunnel.html ---- vpn proxy ---- protect yourself from shodan https://null-byte.wonderhowto.com/how-to/set-up-ssh-server-with-tor-hide-from-shodan-hackers-0194455/ ---- key-gen https://docs.github.com/en/github/authenticating-to-github/connecting-to-github-with-ssh ---- for cert

Syntax	Example	Reference
# Header	Header	基本排版
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`Code`	`Code`	在筆記中貼入程式碼
```javascript var i = 0; ```	`var i = 0;`
:smile:		Emoji list
{%youtube youtube_id %}	Externals
$L^aT_eX$	L^aT_eX
:::info This is a alert area. :::	This is a alert area.