Matching common services and ports | LPIC-1 102-500 Exam original practice question

109.1Standard

Check well-known ports for three common services.

Which set is correct?

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.

SSH 23 / HTTP 443 / HTTPS 80: Incorrect. 23 is Telnet and HTTP/HTTPS are swapped.
SSH 22 / HTTP 80 / HTTPS 443: Correct. The three standard port mappings are shown.
SSH 25 / HTTP 110 / HTTPS 143: Incorrect. These are SMTP, POP3, and IMAP-related values.
SSH 53 / HTTP 123 / HTTPS 161: Incorrect. These are DNS, NTP, and SNMP-related values.

Detailed explanation

IncorrectSSH 23 / HTTP 443 / HTTPS 80

Incorrect. 23 is Telnet and HTTP/HTTPS are swapped.

CorrectSSH 22 / HTTP 80 / HTTPS 443

Correct. The three standard port mappings are shown.

IncorrectSSH 25 / HTTP 110 / HTTPS 143

Incorrect. These are SMTP, POP3, and IMAP-related values.

IncorrectSSH 53 / HTTP 123 / HTTPS 161

Incorrect. These are DNS, NTP, and SNMP-related values.

An example you can run in a temporary verification environment.

python3 -c "import socket; print(socket.getservbyname('ssh','tcp'), socket.getservbyname('http','tcp'), socket.getservbyname('https','tcp'))"

22 80 443

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-109-782

EnvironmentPython 3 socket service database

Last technical review2026-08-13