Here's a gif in attachment that will help you to figure out what I'm trying to say.
I plan to secure 3-tier architecture with firewall that I already have. It's an ASA 5520 and I transformed my Management interface into an Ethernet Interface so as to have 5 Ethernet interface instead of 4.
I'm currently using the inside interface for my internal network and the outside interface to connect a VPN concentrator (I know that the ASA can does most of the things that the CVPN does, but I still want to use the CVPN for all my VPN Client's incoming request)
I want to know if I can use the 3 other Ethernet port to connect my 3 tier layer and also what kind of security level must I use? I'll probably use sub-interface on those 3 physical ports if I have more that 1 server per layer.
Thank you very much and do not bother if someone have already answer, Any comments will be helpful.