thanks for your answer.
I am planning to buy new IAPs now but our budget is so tight. (sorry, our company is poor..)
Also, I am planning to make 2 SSIDs for employee and guest.
But it can't separate our network and would not like to appear our networks to a guest(include network address) for our security policy.
So I'd like to use Virtual Networks(NAT) for hiding our networks.
In the first, I considered to choose IAPs of Low-end model but it's not recommended to use it due to performance is very low after I took counsel with the distributor.
But I could not find about it in the Web, User Guides and more and I posted it to would like to confirm.
Is this true?
If true, is it better to choose IAP305 and upper models?
IAP 305 and AP 303 look like the same model after I used comparison on the web and it's difficult to judge...(I thought this information is a bit poor)