HELO and PORT, respectively, are commands from the protocols
2006
HELO and PORT, respectively, are commands from the protocols
- A.
FTP and HTTP
- B.
TELNET and POP3
- C.
HTTP and TELNET
- D.
SMTP and FTP
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Correct answer: D
Answer: HELO → SMTP; PORT → FTP.
HELO (or EHLO) is an SMTP command used by a client to introduce itself to the mail server at the start of an SMTP session.
PORT is an FTP command used in active mode to tell the FTP server the IP address and TCP port on which the client will accept the data connection.
Why the other pairings are wrong:
HTTP uses request methods like GET, POST, PUT—not HELO.
TELNET is an interactive terminal protocol and does not define HELO or the FTP-style PORT command.
POP3 has commands like USER, PASS, RETR for retrieving mail, not HELO or PORT.