Which one of the following uses UDP as the transport protocol?
2007
Which one of the following uses UDP as the transport protocol?
Answer: C. DNS — Answer: DNS Reason: DNS primarily uses UDP for standard queries because UDP is connectionless and has lower overhead, which is suitable for short…
- A.
HTTP
- B.
Telnet
- C.
DNS
- D.
SMTP
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Correct answer: C
Answer: DNS
Reason: DNS primarily uses UDP for standard queries because UDP is connectionless and has lower overhead, which is suitable for short request/response interactions.
DNS: Uses UDP on port 53 for most queries. It can use TCP on port 53 for zone transfers or when responses exceed UDP size limits.
HTTP: Uses TCP (ports 80 and 443) because it requires reliable, ordered delivery for web content.
Telnet: Uses TCP (port 23) to provide an interactive, reliable terminal session over a byte stream.
SMTP: Uses TCP (port 25) for reliable delivery of email between servers.
Bottom line: DNS is the correct choice because it primarily uses UDP, while the other listed protocols use TCP.
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