LFCS Networking Practice Question
Exhibit
[root@server ~]# nmcli connection show NAME UUID TYPE DEVICE eth0 a1b2c3d4-... ethernet eth0 eth1 e5f6g7h8-... ethernet -- br0 i9j0k1l2-... bridge br0
Refer to the exhibit. An administrator wants to bring up the eth1 interface using the existing connection. Which command should be used?
⚠ Common exam trap
Many exam-takers confuse `nmcli device` with `nmcli connection` — the `device` subcommand manages physical interfaces, while `connection` manages logical profiles, and only `connection up` applies the full configuration from an existing profile.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
nmcli connection up eth1
`nmcli connection up eth1` activates the existing NetworkManager connection profile associated with the eth1 interface. This command ensures that the interface is brought up using the stored configuration (e.g., IP addressing, DNS, routes) rather than just setting the link state. NetworkManager manages connections as profiles, and `nmcli connection up` is the proper way to apply a profile to an interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
nmcli connection up eth1
Why this is correct
This explicitly activates the named connection 'eth1'.
- ✗
nmcli device connect eth1
Why it's wrong here
This tells NetworkManager to activate a connection for that device, but it may not use the existing one specifically.
- ✗
ifup eth1
Why it's wrong here
ifup uses network scripts and may not be compatible with NetworkManager.
- ✗
ip link set eth1 up
Why it's wrong here
This brings the link up but does not configure the IP via NetworkManager.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.