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Which port number is conventionally used by HTTP (cleartext)?
A21
B22
C23
D80
Answer & Solution
Correct answer: D. 80
1. Well-known port assignments (IANA):
- 21: FTP control
- 22: SSH
- 23: Telnet
- 25: SMTP
- 53: DNS
- 80: HTTP (cleartext)
- 110: POP3
- 143: IMAP
- 443: HTTPS
2. So HTTP uses port 80 — option D.
3. Option A is FTP. Option B is SSH. Option C is Telnet.
_Source: RFC 1180 "A TCP/IP Tutorial", §8 (Network Applications)._
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