+------------------+        +------------------+
   | Enterprise       |        | Upstream         |
   | Network          |        | Internet Transit |
   |                  |        | Provider         |
   |      +--------+  |        |             DDoS Attack
   |      | DDoS   |  | <=================================
   |      | Target |  | <=================================
   |      +--------+  |        |                  |
   |                  |        |                  |
   |                  |        +------------------+
   |                  |                            
   |                  |        +------------------+
   |                  |        | DDoS Mitigation  |
   |                  |        | Service Provider |
   |                  |        |                  |
   |  +------------+  |        |  +------------+  |
   |  | DDoS       |<------------>| DDoS       |  | 
   |  | Mitigation |C |        | S| Mitigation |  |
   |  | System     |  |        |  | System     |  |
   |  +------------+  |        |  +------------+  |
   +------------------+        +------------------+

       * C is for DOTS client functionality
       * S is for DOTS server functionality