200-901 Application Deployment and Security Practice Question
Which Docker networking mode provides the most isolation by not connecting the container to any network?
⚠ Common exam trap
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.
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.
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.
- ✗
host
Why it's wrong here
Incorrect. Host shares the host's network stack, least isolation.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.