what is the disadvantage of policing？

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

什么是NAT？

問一個怎么樣的屬性，能讓路由不通告給任何的peer？

R1 will choose which path to reach 10.1.0.0？

Refer to the exhibit.What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown？（）

一堆交換機一個server、一個transpare，問配置prune在哪里配置？

Local Preference？

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 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?（）