ISA Networking layout

Hello -

 I'm looking for some kind of detailed Visio or similar graph on the suggested
networking / interconnect of ISA 2006 with regards to an integration within HMC
4.0 & Exchange 2007 - Physical level - And how it interacts with the 4
zones.

 We are planning on using VLANs on a 3-layer switch (?) but we are debating how
best to connect the ISA to "talk" to the multiple zones - 4 NICs
connected to the 4 zones?

Also, some help with the best way to create an ISA array (2 servers) within this
context (sitting in front of the Edge).  As many details as possible highly
appreciated :)

Thanks :)