LPIC-1 Exam 102 v5 (Linux Administrator) — Question 85

Which of the following protocols is related to the term open relay?

Answer options

• A. SMTP
• B. POP3
• C. NTP
• D. IMAP
• E. LDAP

Correct answer: A

Explanation

SMTP is the protocol that is often linked with open relay because it allows email to be sent between servers, potentially being misconfigured to relay messages from any sender to any recipient. The other protocols listed, such as POP3, NTP, IMAP, and LDAP, do not involve the same type of email relay functionality and are used for different purposes in networking.