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TCP/IP协议 #77

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hushicai opened this issue Sep 11, 2019 · 2 comments
Open

TCP/IP协议 #77

hushicai opened this issue Sep 11, 2019 · 2 comments

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@hushicai
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@hushicai
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hushicai commented Sep 11, 2019 •
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TCP建立连接为什么要三次握手

TCP建立连接时三次握手是为了保证客户端和服务端的读写功能都正常。

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(图片来源https://juejin.im/post/5c666bcff265da2dcf626fd8)

@hushicai
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hushicai commented Sep 11, 2019 •
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TCP断开连接为什么要四次挥手

当客户端发起断开连接的请求FIN，即第一次挥手，代表客户端不会再发送其他数据给服务端，服务端会立即返回一个响应值为ack=seq+1的数据，但是服务端可能还有数据没有传输完，所以要等传输完以后再发送一个新的序列号为y的数据包给客户端，客户端接收到了这个新包以后继续发送一个响应值为y+1的包给服务端，当服务端接收到该包以后双方才会真正关闭连接。

image

（图片来源https://juejin.im/post/5c666bcff265da2dcf626fd8）

@hushicai hushicai changed the title 网络编程 TCP/IP协议 Oct 10, 2019
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