{internet}
                                    |
                                    |
                                  ------
                                  | gw |
                                  ------
                        10.10.0.254 |
                                    |
   +-----------------------------------------------------------------------------+
   |   |      |        |                     |                           |
   |   |      |        | 0.1                 |0.2                        | 0.5
  s1  noc     |      ------                ------                      ------
              |      |rtr1|                |rtr2|         . . .        |rtr5| Cisco 7200's
.241  .250    |      ------                ------                      ------
              |        | 1.254              | 2.254                     | 5.254
         100 - 200     |                    |                           |
          laptops      | 10.10.1.0/24       | 10.10.2.0/24              | 10.10.5.0/24
                   --------------       --------------           ------------------
                  |    |    |    |     |    |    |   |           |     |     |     |
                  |    |    |    |     |    |    |   |           |     |     |     |
                 pc1  pc3  pc5  pc7   pc2  pc4  pc6  pc8        pc17  pc18  pc19  pc20

                 1.1  1.3  1.5  1.7   2.2  2.4  2.6  2.8        5.17  5.18  5.19  5.20