单项选择题
A.Address Resolution Protocol （ARP） B.PDU header rewrite C.NetFlow switching D.hello packet exchange
Whichofthefollowingcommandscanbeissuedwithoutinterferin...
单项选择题Which of the following commands can be issued without interfering with the operation of loop guard？（）
A.Switch（config-if）#spanning-tree guard root B.Switch（config-if）#spanning-tree portfast C.Switch（config-if）#switchport mode trunk D.Switch（config-if）#switchport mode access
A port in a redundant topology is currently in the bloc...
A port in a redundant topology is currently in the blocking state and is not receiving BPDUs. To ensure that this port does not erroneously transition to the forwarding state， which command should be configured to satisfy the requirement？（）
A.Switch（config）#spanning-tree loopguard default B.Switch（config-if）#spanning-tree bdpufilter C.Switch（config）#udld aggressive D.Switch（config-if）#spanning-tree bpduguard
Whichspanning-treecommandwouldcauseaPortFast-enabledint...
单项选择题Which spanning-tree command would cause a PortFast-enabled interface to lose its PortFast-operational status and disable BPDU filtering if it receives BPDUs？（）
A.spanning-tree guard root B.spanning-tree portfast bpduguard default C.spanning-tree bpduguard enable D.spanning-tree bpdufilter enable E.spanning-tree portfast bpdufilter default
