This LFCS practice question tests your understanding of networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An administrator needs to permanently set a static IPv4 address 192.168.1.100/24 on interface eth0 using NetworkManager. Which command achieves this?
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.
Option B is correct because `nmcli connection modify` is the proper command to permanently change a NetworkManager connection profile, and setting both `ipv4.addresses` and `ipv4.method manual` ensures the static IP is applied and the interface does not fall back to DHCP. Without setting the method to `manual`, NetworkManager may ignore the static address or override it with DHCP.
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.
The connection name may not be 'System eth0'; it's typically 'eth0' or the interface name.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget to set `ipv4.method manual` when configuring a static IP, assuming that providing an address alone is sufficient, or they mistakenly use `nmcli device modify` for a permanent change instead of `nmcli connection modify`.
Detailed technical explanation
How to think about this question
NetworkManager uses connection profiles stored in `/etc/NetworkManager/system-connections/`; `nmcli connection modify` updates these profiles persistently. The `ipv4.method` property must be set to `manual` to disable DHCP and use the static address; if left as `auto`, NetworkManager will attempt DHCP even with a static address configured. The `/24` prefix length is equivalent to a netmask of 255.255.255.0 and is defined in CIDR notation per RFC 4632.
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 modify eth0 ipv4.addresses 192.168.1.100/24 ipv4.method manual — Option B is correct because `nmcli connection modify` is the proper command to permanently change a NetworkManager connection profile, and setting both `ipv4.addresses` and `ipv4.method manual` ensures the static IP is applied and the interface does not fall back to DHCP. Without setting the method to `manual`, NetworkManager may ignore the static address or override it with DHCP.
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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