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Why is it that voice and video traffic is often sent over TCP rather than UDP in today’s Internet? (Hint: The answer we are looking for has nothing to do with TCP’s congestion-control mechanism.)
in Computer Networks by Boss (11k points) | 27 views

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Answer: It is done just because the TCP leads to $10\%$ delivery of the data.

by Boss (19.4k points)
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Since most firewalls are configured to block UDP traffic, using TCP for video and voice traffic lets the traffic though the firewalls.
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