30.根据下图，网络管理员如此配置的RA的原因是?

A. to give students access to the InternetA.让students访问Internet

B. to prevent students from accessing the command prompt of RA

B.阻止students访问RA的命令提示符

        C. to prevent administrators from accessing the console of RA

C.阻止管理员访问RA的控制台

D. to give administrators access to the InternetD.让administrators访问Internet

E. to prevent students from accessing the Internet

E.阻止students访问Internet

F. to prevent students from accessing the network

F.阻止students 访问Admin 的网络

Answer: B

31. Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)

31.那两个值被生成树协议用来选举根桥

A. amount of RAMB. bridge priorityC. IOS version

D. IP addressE. MAC addressF. speed of the links

Answer: BE