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

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