What is the next state of initial in spanning-tree protocol？

什么是NAT？

如何實(shí)現(xiàn)擁塞避免？

As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?（）

How should arouter that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?（）

R1 will choose which path to reach 10.1.0.0？

Local Preference？

four switches， which one will be root switch.（no pic）.

aaa架構(gòu)中哪個(gè)是要求用戶輸入用戶名和密碼？

The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration?（）