> >> Bill Cunningham wrote: > >> APEX core data is referred to as datagrams, > >> a term denoting the network layer. Surely APEX > >> core data has to be packeted, even if not framed. > > > Dave Crocker wrote: > > The term 'datagram' does not specify a particular > > level in the communications hierarchy. > > It is a mode, not a layer > > I thought a datagram was at the same layer than a packet, the difference > being what they contain: A packet contains data issued from a > connection-oriented protocol (such as TCP) from the layer above, when a > datagram contains data issued from a connectionless protocol (such as > UDP). > > >From what Bill wrote I would interpret that APEX is a transport layer > (or possibly above), connectionless protocol. > > What am I missing here? > > Michel. If datagram and packet is the same, then what are frames? TCP is carried by PPP frames. I'm not sure about APEX (rfc 3340) > >
