+--------+   +--------+  +--------+
  | Client |   | Client |  | Client |
  +----^---+   +---^----+  +---^----+
       |           |           |
       +-----------|-----------+
                   |ALTO Protocol
                   |
                   |
                +--+-----+  retrieval      +-----------+
                |  ALTO  |<----------------| Routing   |
                | Server |  and aggregation| Protocols |
                |        |<-------------+  |           |
                +--------+              |  +-----------+
                                        |
                                        |  +------------+
                                        |  |Performance |
                                        ---| Monitoring |
                                           |  Tools     |
                                           +------------+