simple network design

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Where can I find some common network architectures? I'd like to see
what mine might fit in.

I've got a small LAN designed and I'd like to know if it's correct or
where I can make improvements. Especially on the wireless side where
I've put my access points which are located on my DMZ.

Basically, I have a firewall with a dmz and on the dmz I have secure
servers (radius or tacacs+) and all my wireless devices (so they can go
through all the normal layers of security by coming in through the
firewall). Then behind the firewall (not on the dmz, but more secure)
is a router w/ a switch attached (I use the switch for VLAN's and more

Comments, suggestions, would be very helpful.

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