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Q: Which of the following protocols uses both TCP and UDP?

  • 1
    FTP
  • 2
    SMTP
  • 3
    Telnet
  • 4
    DNS
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Answer : 4. "DNS"
Explanation :

Answer: D) DNS Explanation: DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.

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