问HN：是什么让你选择了TCP，互联网的传输层？
我在TCP方面卡了很多小时。感觉整体概念还没有完全理解。虽然我觉得自己理解了大部分内容，但仍然有些困惑。现在我在学习回退重传和类似的内容。滑动窗口……数据包格式的记忆并不是问题。我想深入理解内部基础设施工程。
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Been stuck in tcp since lots of hours. Seems like the big picture isn't getting into head. Feels like i understand most stuffs but still..
Go back n, selective repeat and stuffs like that i am at present. Slifing window...packet format memorization is not a big deal. I want yo understand the inner infrastructure engineering