+-----+     +-----+     +-----+    
       +---------->|NODE |     |NODE |     |NODE |
       |           |  4  |--+->|  7  |--+--|  10 |---+  
       |           +-----+     +-----+     +-----+   |  
       |                                             |  
   +-----+                                         +-----+ 
   |NODE |                                         |NODE |
   |  1  |                                         | 11  |
   +-----+                                         +-----+ 
     |                                              |     
     A                    <- Servers ->             Z