单项选择题 How many subnets are possible in an enterprise that has just been assigned an IPv6 prefix by itsISP?（）

单项选择题 As an experienced network administrator, you are asked to troubleshoot a QoS problem. In which way might the Cisco NetFlow be helpful during the troubleshooting process?（）

单项选择题 As a Network Engineer in a large-sized company, you have to master the knowledge of the Cisco mobility solution. Which of the following statement most appropriately identifies the characteristics of it?（）