- A
none
Why wrong: None disables networking entirely.
- B
overlay
Why wrong: Overlay is used for multi-host networking in Swarm.
- C
bridge
Why wrong: Bridge creates an isolated network for containers on the same host.
- D
host
Host mode shares the host's network stack.
Question 63 of 1,000
200-901 Application Deployment and Security Practice Question
This 200-901 practice question tests your understanding of application deployment and security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 network driver allows a container to share the host's network stack, giving it direct access to host interfaces?
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
✓
host
The 'host' network driver in Docker removes network isolation between the container and the host, allowing the container to use the host's network stack directly. This means the container binds to host interfaces and ports without NAT or port mapping, giving it direct access to the host's IP address and network configuration.
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.
- ✗
none
Why it's wrong here
None disables networking entirely.
- ✗
overlay
Why it's wrong here
Overlay is used for multi-host networking in Swarm.
- ✗
bridge
Why it's wrong here
Bridge creates an isolated network for containers on the same host.
- ✓
host
Why this is correct
Host mode shares the host's network stack.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that 'bridge' is the default and most common driver, leading candidates to choose it when the question specifically asks for sharing the host's network stack, which only the 'host' driver provides.
Detailed technical explanation
How to think about this question
Under the hood, the 'host' driver works by not creating a separate network namespace for the container; instead, the container inherits the host's network namespace, meaning it sees the same interfaces, IP tables, and routing table as the host. This is useful for performance-sensitive applications like network monitoring tools (e.g., tcpdump) or services that need to bind to specific host ports without port mapping overhead. However, it sacrifices network isolation, which can be a security concern in multi-tenant environments.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Visual reference
What to study next
Got this wrong? Here's your next step.
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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: host — The 'host' network driver in Docker removes network isolation between the container and the host, allowing the container to use the host's network stack directly. This means the container binds to host interfaces and ports without NAT or port mapping, giving it direct access to the host's IP address and network configuration.
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.
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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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