Identifying a process using a TCP port | LPIC-1 102-500 Exam original practice question

110.1Standard

Use fuser to display the process IDs using local TCP port 443.

Do not terminate any process.

Which command is appropriate?

Hint 1: Focus on the security boundary

Separate permission bits, password state, resource limits, network exposure, and sudo policy before choosing the administrative action.

Hint 2: Key terms

Review the short definitions of permission bits, account controls, process limits, and sudo policy.

fuser: A tool that identifies processes using a file or network resource.
PORT/protocol: The notation used to identify a network resource together with TCP or UDP.
PID: The numeric identifier the kernel assigns to a process.
-k: The fuser option that sends a signal to matching processes.
resource usage: The relationship between a process and the file or port it currently uses.
signal: A kernel notification sent to a process to request an event such as termination.

Detailed explanation

Incorrectfuser -k 443/tcp

Incorrect. -k sends a signal to the matching process and can terminate it.

Incorrectfuser 443/udp

Incorrect. It targets UDP port 443.

Correctfuser 443/tcp

Correct. It displays processes using TCP port 443.

Incorrectfuser tcp/443

Incorrect. The port and protocol order is not the normal fuser form.

An example you can run in a temporary verification environment.

printf '%s
' '443/tcp=TCP port 443' '-k=kill matching processes'

443/tcp=TCP port 443
-k=kill matching processes

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-110-852

Environmentpsmisc fuserの構文対応表

Last technical review2026-08-13

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