The message is split up into smaller messages known as segments or datagrams (for TCP). This statement accurately reflects what occurs when a message is too large to transport on a network.
A packet-switched network's basic transfer unit is called a datagram. Datagrams typically consist of a header and a payload. Over a packet-switched network, datagrams offer a connectionless communication service. The network does not have to guarantee datagram delivery, timing, or sequence of arrival. The user of a datagram service merely provides the destination address; there is no assurance of delivery and no confirmation of a successful delivery. This is similar to how a postal delivery service operates. Therefore, datagram service is regarded as unreliable.
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