Certified Ethical Hacker (CEH v11) — Question 54

Which of the following commands checks for valid users on an SMTP server?

Answer options

• A. RCPT
• B. CHK
• C. VRFY
• D. EXPN

Correct answer: C

Explanation

The command VRFY is specifically designed to check if a given user exists on the SMTP server, making it the correct choice. The RCPT command is used to specify the recipient of an email but does not verify user validity. CHK is not a standard SMTP command, and EXPN is used to expand mailing lists, not to validate individual users.