Remi: One of the essential characteristics of a "datagram" is that it carries all information necessary for it to be delivered _across a network_ ... that is, it contains information that the network can use for routing and forwarding decisions. The network, i.e. the Internet. The functional determination of whether something is a datagram is made in the network, at the IP layer, by network components.
Dave: "user datagram" as in UDP refers to exposing the datagram interface to the user. "This User Datagram Protocol (UDP) is defined to make available a datagram mode of packet-switched computer communication": a "datagram mode" is "made available", that is, the user can send datagrams directly instead of offering a stream or a file that is magically chopped up into datagrams for him. "User datagram" is not a new meaning of datagram. OK? swb
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