多项选择题
Which of the following characteristics describe the BPDU Guard feature（）
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.
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AnOSPFlinkcanbeinmultiplestatesatanygivenmoment（ie.Exstart，exchange，full）.WhichtwoIOScommandsletyouviewthestateofthelink？（）
A.show ip ospf
B.show ip protocols
C.show ip ospf neighbor
D.show ip ospf interface -
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？（）
A.show ip protocols
B.show running-config
C.show ip ospf neighbor
D.show ip ospf border-routers -
单项选择题
WhichcommandshouldyouusetoverifywhatnetworksarebeingroutedbyagivenOSPFprocess？（）
A.show ip ospf
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E.None of the other alternatives apply
