网络扫描. 使用Arp 解析局域网内所有设备, 即使开启防火墙,也可扫描出来. 局限性: 因工作在网络第二层, 无法跨网段扫描-Network scanning. The use of all equipment within the analytical ARP LAN, even open the firewall, scanning. Limitations: because of the work in the second layer of the network, can not c