The answer is `nmcli con mod MyConnection ipv4.dns 1.1.1.1` because the `nmcli con mod` command modifies an existing NetworkManager connection profile, and the `ipv4.dns` property directly sets the IPv4 DNS server for that connection. This property is case-sensitive and must be written in lowercase to match NetworkManager’s D-Bus API, and it replaces any existing DNS entries with the specified value. On the LPIC-2 exam, this tests your ability to manage network configurations from the command line using `nmcli`, a key skill for system administrators working with NetworkManager. A common trap is confusing `ipv4.dns` with `ipv4.dns-search` or using uppercase letters, which will silently fail. To remember, think “mod for modify, dns for domain, all lowercase for the API.”
LPIC-2 Network Client Management Practice Question
This LPIC-2 practice question tests your understanding of network client management. 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.
Exhibit
Refer to the exhibit.
```
# nmcli device show eth0
GENERAL.DEVICE: eth0
GENERAL.TYPE: ethernet
GENERAL.HWADDR: 00:1A:2B:3C:4D:5E
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: MyConnection
WIRED-PROPERTIES.CARRIER: on
IP4.ADDRESS[1]: 192.168.1.100/24
IP4.GATEWAY: 192.168.1.1
IP4.DNS[1]: 8.8.8.8
IP4.DNS[2]: 8.8.4.4
```
Based on the exhibit, which command would change the DNS server to 1.1.1.1 for the connection MyConnection?
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 con mod MyConnection ipv4.dns 1.1.1.1
Option B is correct because the `nmcli con mod` command modifies an existing connection profile, and the `ipv4.dns` property sets the DNS server for IPv4. The property name is case-sensitive and must be lowercase `ipv4.dns` as per NetworkManager's D-Bus API. This command replaces any existing DNS servers with the specified value.
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.
This is the correct nmcli command to modify the DNS setting for the connection.
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 dev mod eth0 ipv4.dns 1.1.1.1
Why it's wrong here
Device modification is temporary and not persistent; connection modification is required.
✗
nmcli con mod MyConnection +ipv4.dns 1.1.1.1
Why it's wrong here
+ipv4.dns appends to the list, but the question asks to change (replace) the DNS server.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the case-sensitive property name (`ipv4.dns` vs `IP4.DNS`) or mistake the `+` prefix for setting rather than appending, leading them to choose options that either use incorrect syntax or do not achieve the intended replacement.
Detailed technical explanation
How to think about this question
NetworkManager stores DNS configuration in connection profiles, which are applied when the connection is activated. The `ipv4.dns` property accepts a space-separated list of DNS server addresses, and using `nmcli con mod` without the `+` prefix overwrites the entire list. This behavior is defined by the NetworkManager D-Bus API, where properties are set via the `SetProperty` method, and the `+` prefix triggers an append operation instead of a replace.
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 LPIC-2 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.
Network Client Management — This question tests Network Client Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: nmcli con mod MyConnection ipv4.dns 1.1.1.1 — Option B is correct because the `nmcli con mod` command modifies an existing connection profile, and the `ipv4.dns` property sets the DNS server for IPv4. The property name is case-sensitive and must be lowercase `ipv4.dns` as per NetworkManager's D-Bus API. This command replaces any existing DNS servers with the specified value.
What should I do if I get this LPIC-2 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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