Structure 1                                 Structure 2
         |  +---+  |  +---+  |  +---+         +---+  |  +---+  |  +---+  |         |
         +--|WAF|--+--|DLB|--+--|Web|       --|RLB|--+--|WAF|--+--|DLB|--+         |
         |  +---+  |  +---+  |  +---+         +---+  |  +---+  |  +---+  |         |
         |         |         |                  |    |         |         |         |
  +---+  |  +---+  |  +---+  |  +---+           |    |  +---+  |  +---+  |  +---+  |
--|RLB|--+--|WAF|--+--|DLB|--+--|WEB|           |    +--|WAF|--+--|DLB|--+--|IPS|--+
  +---+  |  +---+  |  +---+  |  +---+     +=====+    |  +---+  |  +---+  |  +---+  |
         |                   |            |     |    |                   |         |
  +---+  |       +---+       |  +----+    |   +---+  |                   |  +---+  |
--|RLB|--+-------|IPS|-------+--|Step|    | --|RLB|--+                   +--|IPS|--+
  +---+  |       +---+       |  +----+    |   +---+  |                   |  +---+  |
         |                   |            |                              |
         |       +---+       |            +==============================+ 
         +-------|IPS|-------+                                           |
         |       +---+       |