防火墙对流经它的网络通信进行扫描，这样能够过滤掉一些攻击，以免其在目标计算机上被执行.一个简单的防火墙，能够抓包，过滤.-Firewall for network traffic flowing through it to scan, this can filter out some of the attacks, so that they will be executed on the target computer. A simple firewall that can capture, f