[W/K] :: transport layer

  transport layer
       
           (Or "host-host layer") The middle layer in the
          OSI seven layer model.  The transport layer determines how
          to use the network layer to provide a virtual error-free,
          point to point connection so that host A can send messages to
          host B and they will arrive un-corrupted and in the correct
          order.  It establishes and dissolves connections between
          hosts.  It is used by the session layer.
       
          An example transport layer protocol is Transmission Control
          Protocol (TCP).
       
          OSI documents: ITU Rec. X.214 (ISO 8072), ITU Rec. X.224
          (ISO 8073).
       
          (1997-12-07)