多项选择题
A.ABPDU Guard port should only be configured on ports with PortFast enabled.
B.BPDU Guard and PortFast should not be enabled on the same port.
C.BPDU Guard is used to ensure that superior BPDUs are not received on a switch port.
D.ABPDU Guard port receiving a BPDU will go into err-disablestate.
E.ABPDU Guard port receiving a BPDU will be disabled.
F.BPDU Guard can be enabled on any switch port.
多项选择题 AnOSPFlinkcanbeinmultiplestatesatanygivenmoment（ie.Exstart，exchange，full）.WhichtwoIOScommandsletyouviewthestateofthelink？（）
单项选择题 You have a multi-area OSPF network and you’re concerned because one of the sites is havingconnectivity problem to resources in a different area. Which IOS privileged mode command wouldyou enter to confirm that your network： （A） has a path to its ABR， （B） has a path to its ASBR， and （C）the SPF calculation is functional？（）
单项选择题 WhichcommandshouldyouusetoverifywhatnetworksarebeingroutedbyagivenOSPFprocess？（）