问答题 whatisURPF？
多项选择题 ThecoreofanetworkhasfourroutersconnectedinasquaredesignwithGigabitEthernetlinksusing/30subnets.Thenetworkisusedtocarryvoicetrafficandotherapplications.Convergencetimeistakingmorethanexpected.WhichthreeactionswouldyoutaketoimproveOSPFconvergencetime？（）
问答题 whatistheNAToverloading？