Explain the difference between datagram-oriented and byte-stream oriented transport semantics.

• A. Datagram-oriented (UDP) delivers discrete packets; byte-stream (TCP) presents a continuous stream of bytes with no inherent message boundaries.
• B. Both provide message boundaries; no difference.
• C. Datagram-oriented ensures order but not delivery.
• D. Byte-stream conveys packets with boundaries.

Answer: (A)

The main idea is how the transport layer handles boundaries of data. In a datagram-oriented transport, data is sent as separate, self-contained units called datagrams. Each datagram is delivered as an independent packet, preserving its own boundary, but there’s no guarantee of delivery or order. This matches how UDP works.

In a byte-stream oriented transport, data is treated as one continuous stream of bytes with no inherent message boundaries. The receiver gets a stream and must use its own framing to determine where one message ends and the next begins, if message boundaries are even meaningful at all. This is how TCP operates.

So the best description is: datagram-oriented delivers discrete packets, while byte-stream presents a continuous stream of bytes with no inherent message boundaries. The other statements misstate how boundaries and delivery guarantees work in these transports.