This LPIC-2 practice question tests your understanding of advanced networking configuration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is troubleshooting network isolation in a Linux container environment. The container should have its own network stack, but it appears to be using the host's interfaces. Which command correctly runs a command inside a network namespace named 'ns1' to verify its network configuration?
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.
nsenter -t 1234 -n ip addr show
Why wrong: Requires process PID; not for named namespace.
ip netns exec ns1 ip addr show
Executes command in named network namespace.
unshare -n ip addr show
Why wrong: Creates new namespace, does not use existing one.
ip netns add ns1
Why wrong: Only adds namespace, does not execute command.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ip netns exec ns1 ip addr show
Option B is correct because the `ip netns exec` command is specifically designed to execute a command within a given network namespace. In this scenario, `ip netns exec ns1 ip addr show` runs the `ip addr show` command inside the network namespace named 'ns1', allowing the administrator to verify that the container has its own network stack and is not using the host's interfaces.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
nsenter -t 1234 -n ip addr show
Why it's wrong here
Requires process PID; not for named namespace.
ip netns exec ns1 ip addr show
Why this is correct
Executes command in named network namespace.
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.
unshare -n ip addr show
Why it's wrong here
Creates new namespace, does not use existing one.
ip netns add ns1
Why it's wrong here
Only adds namespace, does not execute command.
Common exam traps
The trap here is that candidates confuse `nsenter` with `ip netns exec`; while both can enter a network namespace, `nsenter` requires a process PID and does not directly support named namespaces, whereas `ip netns exec` is the correct tool for named network namespaces like 'ns1'.
Trap categories for this question
Command / output trap
Only adds namespace, does not execute command.
Detailed technical explanation
Network namespaces virtualize the network stack, providing each namespace with its own interfaces, routing tables, and firewall rules. The `ip netns exec` command uses the `nsenter` system call under the hood to attach to the namespace's network stack, but it works with named namespaces managed by the `ip netns` infrastructure, which stores bind mounts in `/var/run/netns/`. A real-world scenario is verifying that a Docker container (which uses network namespaces) has the correct IP address and routes after being moved to a custom namespace for isolation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: ip netns exec ns1 ip addr show — Option B is correct because the `ip netns exec` command is specifically designed to execute a command within a given network namespace. In this scenario, `ip netns exec ns1 ip addr show` runs the `ip addr show` command inside the network namespace named 'ns1', allowing the administrator to verify that the container has its own network stack and is not using the host's interfaces.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-2 practice question is part of Courseiva's free LPI 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 LPIC-2 exam.
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