CompTIA
N10-005 · Question #857
N10-005 Question #857: Real Exam Question with Answer & Explanation
The correct answer is B: 23. Telnet uses TCP port 23 for unencrypted remote terminal access. The other ports listed serve different protocols: port 21 is FTP (file transfer), port 80 is HTTP (web traffic), and port 143 is IMAP (email retrieval). Because Telnet transmits data in plaintext, it has largely been
Question
Which of the following ports is used by Telnet?
Options
- A21
- B23
- C80
- D143
Explanation
Telnet uses TCP port 23 for unencrypted remote terminal access. The other ports listed serve different protocols: port 21 is FTP (file transfer), port 80 is HTTP (web traffic), and port 143 is IMAP (email retrieval). Because Telnet transmits data in plaintext, it has largely been replaced by SSH (port 22) in modern environments.
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