Multiple choice

The transport layer protocols used for real-time multimedia, file transfer, DNS and email respectively are

  1. TCP, UDP, UDP and TCP

  2. UDP, TCP, TCP and UDP

  3. UDP, TCP, UDP and TCP

  4. TCP, UDP, TCP and UDP
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Real-time multimedia needs connectionless service, so underlying transport layer protocol used is UDP. File transfer runs over TCP protocol with port no. 21. DNS runs over UDP protocol within port no. 53. Email needs SMTP protocol which runs over TCP protocol within port no. 25.

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