多项选择题
A.transparent B.auto C.on D.desirable E.blocking F.forwarding
流控的三种方式是（）、（）、（）。
填空题流控的三种方式是（）、（）、（）。
Which two values are used by Spanning Tree Protocol to ...
多项选择题Which two values are used by Spanning Tree Protocol to elect a root bridge (Choose two.)（）。
A.amount of RAM B.bridge priority C.IOS version D.IP address E.MAC address F.speed of the links
Which component of VPN technology ensures that data can...
单项选择题Which component of VPN technology ensures that data can be read only by its intended recipient?（）
A.dataintegrity B.encryption C.keyexchange D.authentication
