客户端和服务端通知对方版本的那个包到底是谁先发谁后发呢？我自己观察到的是客户端先发，但是看别人抓包则相反( https://www.youtube.com/watch?v=XfWQ-jXPd8g)
服务端等客户端先发有什么好处？，为何不惜增大连接建立所用时间这样做呢
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Supplement 1 · Jan 22, 2017
最后一句说错，应为“（像视频里一样）客户端等服务端……”
补图： https://stackoverflow.com/questions/16205240/which-side-will-initiate-the-version-negotiation-in-the-ssh-transport-layer-prot
补图： https://stackoverflow.com/questions/16205240/which-side-will-initiate-the-version-negotiation-in-the-ssh-transport-layer-prot
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