Listing network interface link state | LPIC-1 102-500 Exam original practice question

109.3Standard

Use iproute2 to list interface names, UP/DOWN flags, and link information such as MAC addresses.

Do not change addresses or routes.

Which command is appropriate?

Hint 1: Focus on the observed layer

Separate interface state, routes, sockets, and application reachability before choosing a diagnostic command.

Hint 2: Key terms

Review the short definitions of interface, route, socket, and application diagnostics.

link object: The iproute2 object representing interface state, MTU, and link-layer address.
ip link: The iproute2 object used to display or change network-interface link information.
administrative state: The UP or DOWN state assigned to an interface by an administrative operation.
MAC address: A link-layer address used to identify an interface on a local link.
MTU: The largest packet payload that a link can carry as one transmission unit.

Detailed explanation

Correctip link show

Correct. It displays link-layer information for interfaces.

Incorrectip address add

Incorrect. address add changes an IP address.

Incorrectip route flush

Incorrect. route flush removes routes.

Incorrectip neigh replace

Incorrect. neigh replace changes a neighbor entry.

An example you can run in a temporary verification environment.

printf '%s
' 'ip link show -> interface flags, state, MTU, link address'

ip link show -> interface flags, state, MTU, link address

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-109-813

Environment操作対応表の表示のみ

Last technical review2026-08-13

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