This LFCS practice question tests your understanding of networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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
Option A is correct because `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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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'.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
NetworkManager uses D-Bus to communicate with its daemon and stores connection profiles in `/etc/NetworkManager/system-connections/`. The `nmcli connection up` command triggers the daemon to apply the profile's settings, including DHCP or static IP, DNS servers, and routing rules. A common real-world scenario is after a network outage, where `nmcli connection up eth1` restores full connectivity without manual reconfiguration, whereas `ip link set eth1 up` would leave the interface without an IP address.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LFCS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: nmcli connection up eth1 — Option A is correct because `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.
What should I do if I get this LFCS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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