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

The correct answer is A. SMTP. SMTP (Simple Mail Transfer Protocol) is correct because an open relay is an SMTP server misconfigured to forward email from any sender to any recipient - essentially acting as an anonymous mail forwarder, which spammers and attackers exploit to send bulk or spoofed email. The…

Essential System Services

Question

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

Options

ASMTP
BPOP3
CNTP
DIMAP
ELDAP

How the community answered

(26 responses)

A
77% (20)
B
12% (3)
C
8% (2)
E
4% (1)

Explanation

SMTP (Simple Mail Transfer Protocol) is correct because an open relay is an SMTP server misconfigured to forward email from any sender to any recipient - essentially acting as an anonymous mail forwarder, which spammers and attackers exploit to send bulk or spoofed email. The other options are unrelated to mail sending: POP3 and IMAP are protocols for retrieving email (read-only access to a mailbox), NTP is the Network Time Protocol for clock synchronization, and LDAP is the Lightweight Directory Access Protocol used for querying directory services like Active Directory.

Memory tip: Think "relay race" - SMTP relays messages from server to server; an open relay does so without restriction, like a race with no start line or finish line checking who's allowed to run.

Topics

#SMTP#open relay#email security#mail protocols

Community Discussion

No community discussion yet for this question.

Full 102-500 Practice