Distinguishing SMTP ports | LPIC-1 102-500 Exam original practice question

109.1Standard

Match the standard SMTP server-to-server port and the representative implicit-TLS submission port.

Which pairing is appropriate?

Hint 1: Focus on the requirement

Identify what must change and what must remain unchanged. Then choose the command whose scope matches that requirement.

Hint 2: Check each command's role

Separate commands that display information, change state, remove data, or affect a child process.

SMTP transfer TCP 25 / submissions TCP 465: Correct. The pair matches SMTP transfer and implicit-TLS submission.
SMTP transfer TCP 110 / submissions TCP 995: Incorrect. 110 and 995 are POP3 and POP3S.
SMTP transfer TCP 143 / submissions TCP 993: Incorrect. 143 and 993 are IMAP and IMAPS.
SMTP transfer UDP 25 / submissions UDP 465: Incorrect. SMTP sessions normally use TCP.

Detailed explanation

CorrectSMTP transfer TCP 25 / submissions TCP 465

Correct. The pair matches SMTP transfer and implicit-TLS submission.

IncorrectSMTP transfer TCP 110 / submissions TCP 995

Incorrect. 110 and 995 are POP3 and POP3S.

IncorrectSMTP transfer TCP 143 / submissions TCP 993

Incorrect. 143 and 993 are IMAP and IMAPS.

IncorrectSMTP transfer UDP 25 / submissions UDP 465

Incorrect. SMTP sessions normally use TCP.

An example you can run in a temporary verification environment.

printf '%s
' 'smtp 25/tcp' 'submissions 465/tcp'

smtp 25/tcp
submissions 465/tcp

Foundation review

Check whether the command acts on the current shell, a new process, an existing process, or a file.

Use the supplied command and compare the output with the expected result.

Question IDKP-109-785

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Last technical review2026-08-13