单项选择题 You are the network consultant from pass4sure.com. One of your customer has six sites, three of which process a large amount of traffic among them. He plans to grow the number of sites in the future. Which is the most appropriate design topology?（）

单项选择题 Please match the Cisco NAC appliance component to its description.（） (1)Cisco NAS (2)Cisco NAA (3)Rule-set Lpdates (4)Cisco NAM (a) a centralized management point (b) an in-band cr out-of-band device for network access control (c) a Windows-based client which allows network access based on the tasks running (d) a status crecker for operating systems,antivirus,antispyware,etc.

多项选择题 Refer to the exhibit. Which two statements about the topologies shown are correct?（）