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+---
+title: What-happens-type-url-into-browser-and-press-enter
+date: 2021-09-11T16:21:12+08:00
+tags: ["network", "interrput", "dns"]
+---
+
+## dns query
+
+get the ip of the target domain
+
+### browser cache
+
+firefox(about:networking#dns)
+
+### /etc/hosts
+
+### os cache
+
+1. macos 查看 dns 请求日志 sudo log stream --predicate 'process == "mDNSResponder"' --info
+
+
+### dns resolver
+
+/etc/resolv.conf
+
+1. arp -a 查看有没有 dns 服务器的 mac 地址
+2. ARP request for the nameserver
+3. send dns query to get the ip of the domain
+
+## arp 获取 gateway 的 mac 地址
+
+## References
+
+1. [keyborad-interrput](http://www.science.smith.edu/~nhowe/262/oldlabs/keyboard.html)
+2. [Chrome 是怎么判断地址栏输入的东西是不是网址? -omnibox](https://www.zhihu.com/question/560616439/answer/2722866208)
+3. [firefox dns](about:networking#dns) 
+4. [ARP](https://www.fortinet.com/resources/cyberglossary/what-is-arp)