- A
overlay
Why wrong: Incorrect. Overlay is for multi-host networking.
- B
bridge
Why wrong: Incorrect. Bridge is the default, providing isolated but connected networking.
- C
none
Correct. none disables all networking.
- D
host
Why wrong: Incorrect. Host shares the host's network stack, least isolation.
Question 312 of 1,000
200-901 Application Deployment and Security Practice Question
This 200-901 practice question tests your understanding of application deployment and security. 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.
Which Docker networking mode provides the most isolation by not connecting the container to any network?
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
✓
none
The `none` networking mode in Docker creates a container with no network interfaces except the loopback device, providing the highest level of network isolation. This means the container cannot send or receive any external traffic, making it ideal for security-sensitive workloads that require complete network disconnection.
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.
- ✗
overlay
Why it's wrong here
Incorrect. Overlay is for multi-host networking.
- ✗
bridge
Why it's wrong here
Incorrect. Bridge is the default, providing isolated but connected networking.
- ✓
none
Why this is correct
Correct. none disables all networking.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
host
Why it's wrong here
Incorrect. Host shares the host's network stack, least isolation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that 'none' means no network at all (including loopback), but the container still has a loopback interface; the trap is that candidates confuse 'none' with 'host' or assume bridge provides stronger isolation than it actually does.
Detailed technical explanation
How to think about this question
Under the hood, `docker run --network none` creates a container with only the `lo` loopback interface and no `eth0` or other network adapters, as confirmed by `ip link` inside the container. This mode is often used for offline batch processing, security sandboxing, or when the container only needs local Unix socket communication. The isolation is enforced at the Linux network namespace level, where the container's network namespace is created but left empty of any external interfaces.
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 200-901 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.
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Application Deployment and Security — study guide chapter
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FAQ
Questions learners often ask
What does this 200-901 question test?
Application Deployment and Security — This question tests Application Deployment and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: none — The `none` networking mode in Docker creates a container with no network interfaces except the loopback device, providing the highest level of network isolation. This means the container cannot send or receive any external traffic, making it ideal for security-sensitive workloads that require complete network disconnection.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.
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