Client
  |
TL-SG3424 (Switch A2)
  |
TL-SG3424 (Switch A1)
  |
TL-ER6120 (Router)

_________      _________      _________      _________
  | Clients |    | Clients |    | Clients |    | Clients |
   ‾|‾‾‾‾‾‾‾      ‾|‾‾‾‾‾‾‾      ‾|‾‾‾‾‾‾‾      ‾|‾‾‾‾‾‾‾
    |   _|_/      |   _|_/      |   _|_/      |
    |   |A P|      |   |A P|      |   |A P|      |
    |    ‾|‾       |    ‾|‾       |    ‾|‾       |
  __|_____|__    __|_____|__    __|_____|__    __|________
 | TL-SG3424 |――| TL-SG3424 |  | TL-SG3424 |  |  Netgear  |
 |(Switch A2)|  |(Switch A1)|  |(Switch B1)|  |(Switch C1)|
  ‾‾‾‾‾‾‾‾‾‾‾    ‾‾‾‾‾|‾‾‾‾‾    ‾‾‾‾‾|‾‾‾‾‾    ‾‾‾‾‾|‾‾‾‾‾
              ________|______________|______________|_
             |           TL-ER6120 (Router)           |
              ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾|‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
                               ___|_______________
                              | Fritz!Box (Modem) |
                               ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾