There are many tools used in topology discovery of multi-layer networks, such as Ping tests IP connectivity, Traceroute discovers routers, DNS provides mapping between IP address and host names. ARP keeps MAC and IP address in a LAN and maps IP to MAC.

• 网络多层拓扑发现常用工具有多种:Ping测试IP的连通性,Traceroute发现路由器,DNS提供IP地址与主机名称间的映射,ARP保存同局域网设备的MAC和IP地址并将IP映射为MAC。