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Module 5: Application Layer & Security

20232m

What type of application would prefer UDP transport service?
(i) Video conferencing
(ii) World Wide Web (WWW)
(iii) Online chess game
(iv) Email

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Answer

(i) Video conferencing

Explanation

UDP is connectionless and does not provide TCP-style reliable, ordered delivery. This makes it useful for real-time applications where low delay is more important than retransmitting every lost packet.

In video conferencing, a small amount of packet loss may be preferable to the delay caused by retransmission. Real-time media applications can also use application-level mechanisms to handle loss.

  • WWW: Traditionally uses TCP (modern HTTP/3 uses QUIC over UDP, but this question follows the traditional model).
  • Email: Uses TCP-based protocols such as SMTP.
  • Online chess: Usually prioritizes reliable delivery of moves and can use TCP.

Final answer: (i) Video conferencing.

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