The design is:
1. Perimeter ASA
2. Front end servers (DMZ)
3. FWSM on Cat 6500
4. Back end servers - includes customer & transactional database (DMZ 1)
5. Back end connectivity to another site for transactional processing & response which then updates the backend servers customer & transactional database(INSIDE)
My query is whether point 5 should be given higher security level (INSIDE) than point 4 (DMZ1) or vice versa. What factors do I need to consider to decide on the security levels.