[1] : The Free On-line Dictionary of Computing (27 SEP 03)

upper layer protocol
     
         1. ulp, or upper-layer protocol
        any protocol residing in osi layers five or above.
     
        the internet protocol suite includes many upper layer
        protocols representing a wide variety of applications
        e.g. ftp, nfs, rpc, and smtp.  these and other network
        applications use the services of tcp/ip and other lower
        layer protocols to provide users with basic network services.
     
        2. a protocol higher in the osi reference model than the
        current reference point.  upper layer protocol is often used
        to refer to the next-highest protocol in a particular
        protocol stack.
     
        1999-02-17
     
     
see also:
protocol osi internet ftp nfs rpc 
smtp tcp/ip lower layer protocols protocol stack 

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