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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

Correct answer: UDP, TCP, UDP and TCP

Solution

UDP is preferred for real-time multimedia due to its low latency, while TCP is used for file transfer and email because it ensures reliable delivery. DNS also uses UDP for quick query responses.

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