WAN standards typically describe both physical layer delivery methods and data link layer requirements, including physical addressing, flow control, and encapsulation. 广域网路标准典型地描述实体层的传送方法和资料链结层的需求，包括实体层定址，流量控制和封装。
When this feature is disabled any packets received that are destined for a subnet that falls within the subnetwork addressing scheme of the router will be discarded. 如果此功能被停用，当路由器收到目的地为特定子网路的封包，而这些子网路正好在路由器的子网定址机制内，则这些封包将被丢弃。
