June 2020
Intermediate to advanced
423 pages
7h 58m
Chinese
Content preview from Kali Linux学习手册
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56
｜
第
2
章
到第
5
层就变得具有挑战性了，因为这一层并不是那么容易理解。第
5
层是
草莓，因为我们的蛋糕中需要一些水果作为调味品。这就是会话层。会话层
完全是为了协调长期通信，从而确保一切都是同步的。你可以这样看待会话层，
它是为了确保你和我同时吃蛋糕（并沟通），我们得以保持相同的速度行动，
因为我们会同时开始和结束。如果我们需要停下来喝杯水，会话层将确保我
们同时这样做。如果我们想要喝牛奶而不是水，会话层将确保我们完全同步，
这样我们可以同时开始和结束，以便我们进食的状态看起来也完全相同。因
为这完全取决于它看起来像什么。
接下来是花生酱层，因为哪一块蛋糕中会没有花生酱？特别是我们的蛋糕中
还有果酱。这就是表示层。表示层负责让一切看起来完好无损。表示层将确
保整个地方不存在瑕疵，比如，确保放入你口中的东西看起来像蛋糕。
最后是杏仁层，这就是应用层。总之，这是最接近食客（用户）的层。它需
要从表示层中获取内容，并以用户预期的方式传递给用户。蛋糕中的元素在
这里只是一个类比，更重要的是当你使用刀叉将食物送入口中时，会从杏仁
层直接抵达开心果层。这就是你将一片蛋糕转移到叉子上的方法。不过，当
享用它时，首先进入口腔的是最底下的开心果。这与我们发送和接收数据消
息的方式相同。它们是从应用层向下构建并发送的。当它们被接收时，是从
物理层向上分解的，从每一层剥离头部从而暴露下一层。
当我们进行网络测试时，可能会在蛋糕的不同层之间工作。这就是理解每一
层的基本原理是如此重要的原因。你需要理解每一层预期的输出，以便确定
所看到的行为是否正确 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.