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?（）

The Frame Relay network in the diagram is not functioning properly.What is the cause of the problem?（） 

什么問題導(dǎo)致SERVER VTP密碼跟替他交換機VTP密碼不匹配？

什么是NAT？

當(dāng)將多個交換機加入到MST region當(dāng)中會發(fā)生什么（what happen）？

SPT初始狀態(tài)之后的一個狀態(tài)是什么？

Which of the following are key characteristics of PPP?（）

如何實現(xiàn)擁塞避免？

QoS Mechanisms：問在部署QoS中要用的3個mechanisms是什么？

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?（）