During a campus event, the university live-streams a talk show to hundreds of students. Some packets may be dropped, but the priority is to keep the stream smooth with minimal delay rather than waiting for retransmissions. Which transport layer protocol is most suitable for this type of real-time streaming?

Question

BlackTom AI · Accepted Answer

UDP is connectionless and does not wait for retransmissions, making it the best match for low-latency real-time streaming.

1) Relevant knowledge points and concepts
- Transport layer protocols: TCP (Transmission Control Protocol) provides reliable, ordered delivery with retransmissions and flow control; UDP (User Datagram Protocol) is connectionless, unordered, no retransmissions, low overhead. HTTP is an application-layer protocol that usually runs over TCP. ICMP is for network diagnostics (e.g., ping) and is not a transport protocol for application data. Real-time streaming (audio/video) often tolerates some packet loss but requires minimal delay and smooth playback; protocols like RTP/RTSP or QUIC often run over UDP.

2) Step-by-step reasoning
- Requirement: prioritize smooth playback and minimal delay, accept occasional lost packets.
- TCP would retransmit lost packets and enforce ordering, which introduces delay and jitter — harmful for live streaming where late packets are useless.
- UDP sends packets without acknowledgments or retransmissions, so a lost packet is simply dropped and playback continues, preserving low latency.
- Therefore a connectionless, no-retransmit protocol is most suitable.

3) Calculations
- No numeric calculations are required; reasoning is qualitative based on latency vs. reliability trade-offs.

4) Why the correct answer is correct
- UDP’s lack of retransmission and small overhead reduces latency and jitter, enabling continuous, low-delay delivery of streaming media. That directly matches the scenario’s priority to keep the stream smooth rather than recover every lost packet.

5) Why other options are incorrect
- a. HTTP: runs over TCP and would inherit TCP’s retransmissions and latency, so not suitable.
- b. ICMP: not a transport protocol for application streaming; used for diagnostics only.
- c. TCP: ensures reliability via retransmissions and ordering, but these add delay and can interrupt smooth real-time playback.

6) Conclusion
- The most suitable transport layer protocol for this live, low-latency streaming scenario is d. UDP. This confirms the provided answer: d. UDP.

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