单项选择题
A.As numbers must be changed to match on all the routers.
B.Loopback interface must be configured so a DR is elected.
C.The no auto-summary command is needed on Router A and Router C.
D.Router B needs to have two network statements, one for each connected network.
单项选择题 Refer to the exhibit. Which of these statements correctly describes the state of the switch once the boot process has been completed?（）
单项选择题 Select the action that results from executing these commands.（）Switch(config-if)# switchport port-securitySwitch(config-if)# switchport port-security mac-address sticky
多项选择题 Which two commands correctly verify whether port security has been configured on port FastEthernet 0/12 on a switch?（）