The transport layer protocols used for real time multimedia,

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The transport layer protocols used for real time multimedia, file transfer, DNS and e-mail, 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

Correct Option: C

The Transport layers protocols used for
l. Real Time Multimedia can be unreliable but has to be tast so UDP.
2. File Transfer has to be secure and reliable so uses TCP.
3. DNS Domain name system can be both TCP and UDP
4. Email User TCP for reliability. Hence, answer is option (c) UDP, TCP, UDP and TCP