+------------------------------------+
      Interest | +------+     +------+     +------+ |        +-----+
 +-+        ---->|  CS  |---->| PIT  |---->| FIB  |--------->| CDN |
 | |           | +------+     +------+     +------+ |        +-----+
 +-+           |     |      Add  |       Drop |     | Forward
 MT         <--------+      Intf v       Nack v     |
         Data  |                                    |
               +------------------------------------+



               +------------------------------------+
 +-+           |  Forward                  +------+ |        +-----+
 | | <-------------------------------------| PIT  |<---------| CDN |
 +-+           |                 | Cache   +--+---+ | Data   +-----+
 MT            |              +--v---+        |     |
               |              |  CS  |        v     |
               |              +------+      Discard |
               +------------------------------------+