Bringing a link administratively up | LinuC Level 1 102 Exam original practice question

1.07.3Basic

Return enp1s0 from administrative DOWN to UP with iproute2.

Do not add an IP address.

Which command is appropriate?

Hint 1: Focus on the observed layer

Separate interface counters, sockets, DNS lookups, path tracing, and routing changes before comparing the diagnostic commands.

Hint 2: Key terms

Review the short definitions of interface counters, sockets, DNS, path tracing, and routes involved.

ip link set: An operation that changes a network link's administrative state or attributes.
up: A state value that enables an interface administratively.
show: A read-only operation that displays the current link state.
ip address add: An operation that adds a local IP address to an interface.
ip route add: An operation that adds a route to the routing table.
Administrative state: The enabled or disabled state assigned to an interface by an administrator.

Detailed explanation

Incorrectip address add up dev enp1s0

Incorrect. This is not valid address syntax.

Incorrectip route add up dev enp1s0

Incorrect. It does not change link state and treats up as a route value.

Incorrectip link show dev enp1s0 up

Incorrect. show only inspects the link.

Correctip link set dev enp1s0 up

Correct. It sets enp1s0 administratively up.

An example you can run in a temporary verification environment.

ip link help 2>&1 | sed -n '1,6p'

ip link setのup、downなどの構文概要

Foundation review

Kernel-maintained counts of packets, errors, and drops at an interface.

A local or remote endpoint associated with a transport protocol and process.

A diagnostic method that observes hops and path limits toward a destination.

Question IDKL-102-1000

Environmentiproute2 help / 状態変更なし

Last technical review2026-08-13

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