多项选择题
A.OSPF hello interval is 5 seconds
B.OSPF hello interval is 1 second
C.OSPF dead interval is 1 second
D.OSPF dead interval is 5 seconds
E.OSPF dead interval is 20 seconds
F.OSPF hello interval is 0.2 second
多项选择题 WhichfourofthesestatementsarerestrictionsforFrameRelayPVCbundleswithQoSsupportforIPand MPLS？（）
多项选择题 InwhichtwowaysdoestheBGPgracefulcapabilitypreserveprefixinformationduringarestart？（）
多项选择题 CiscoIOSXRsoftwareispartitionedintothreeplanes：control，data，andmanagement.Whichthreeofthesebelongtothedataplane？（）