可以看到系统A向系统b发送了一个小数据包，然后等待响应包，已决定同意或拒绝登录请求。
Observe that system a sends a small data packet to system b, and waits for a response packet before granting or denying the login request.
IP数据包太大的话就会被分割成多个小数据包，每一个被分割的部分称作片段。
IP packets that are too large can be split into multiple packets, and each part is called a fragment.
把你的网络数据看成一个你必须送到某个地方的干净的小数据包。
Consider your network data a neat little package that you have to deliver somewhere.
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