填空题 15.  An interior routing protocol will view a ______ as either point-to-multipoint (for strict hub-and-spoke DMVPNs) or as a broadcast network (partial or full mesh DMVPNs). 动态路由协议将把______看作一个点到多点网络(严格的中心到分支模型的DMVPN)或广播网络(部分互连或全互连模型的DMVPN)。