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.
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.
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