单项选择题
A.24
B.4
C.3
D.16
多项选择题 Which statements describe two of the benefits of VLAN Trunking Protocol?（）
单项选择题 Anetworkadministratormustconfigure200switchportstoaccepttrafficfromonlythecurrentlyattachedhostdevices.WhatwouldbethemostefficientwaytoconfigureMAC-levelsecurityonalltheseports？（）
多项选择题 Which can be done to secure the virtual terminal interfaces on a router?（）