{internet}
                                    |
                                    | <-- wireless or wired ethernet
                                    |
                                    | external network
                                  ------
                                  | gw | fitPC2
                                  ------
                        10.10.0.254 |
                                    |
                                  ------
                10.10.0.0/24      | sw | HP V1900G-8G
                                  ------
                               .253 |
                                    |
   +----+---+-----+-----+------+----+---+----+----+----+--------+----+----+
   |    |   |     |     |      |        |    |    |    |  ...   |    |    |
   |    |   |     |     |      |        |    |    |    |        |    |    |
  s1    s2  s3*  noc   ap1    ap2      pc1  pc2  pc3  pc4     pc28  pc29  pc30

.241  .242 .243 .250  .251   .252      .1   .2   .3   .4       .28  .29   .30
                       |      |     
                       |      |        
                        \    /         
                         \  /       
                          --        
                        laptops / pcs     
                        50-149