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Why UDP is preferred over TCP for real-time applications such as telephone.?
Wiki User
∙ 11y ago
TCP
v No loss
v Retransmits all lost messages
v Potentially large latency
UDP
v Potentially unbounded loss
v Does no retransmission
v Minimal latency
à Neither of them is what you want for streaming applications
Solution
v UDP with
o Congestion control
o Reliability control (error protection)
v How?
o Keep UDP throughput ~ to TCP
o By using FEP (forward error protection) and ARQ (automatic repeat request)
v Advantage
o Can recover from loss in time independent of link RTT
o Unequal protection: more important data is better protected
o Pre-roll buffers to cope with increased delay for streaming applications
v Disadvantage
o Pay overhead
o Increased delay
o Poor quality for real-time applications
Wiki User
∙ 11y ago
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Is preferred over TCP for real-time applications such as telephone conversations and videoconferencing?
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