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XK0-006 Practice Question: An administrator runs the commands shown in the…
Network Topology
An administrator runs the commands shown in the exhibit. The container is accessible via curl using the container IP. However, the administrator cannot access the web server using the host's IP address on port 80. What is the most likely cause?
⚠ Common exam trap
Many candidates assume a running container with a working service is automatically accessible on the host's IP, but Docker requires explicit port publishing to bridge the host network namespace to the container's network namespace.
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
✓
The container's port 80 is not published to the host.
The administrator ran `docker run -d nginx` without the `-p` or `--publish` flag, which means port 80 inside the container is not mapped to any port on the host. The container is accessible via its own IP because Docker networking allows direct container-to-container communication, but the host's IP on port 80 remains unbound, so curl to the host IP fails. Publishing the port with `-p 80:80` would expose the container's port 80 on the host's interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The container's IP address is incorrect.
Why it's wrong here
The IP 172.17.0.2 is correct and accessible via curl.
- ✓
The container's port 80 is not published to the host.
Why this is correct
No -p option was used; port is only accessible on the container's network.
- ✗
Nginx is configured to listen on a different port.
Why it's wrong here
The exec command shows listen 80.
- ✗
The container is not running.
Why it's wrong here
The STATUS shows 'Up 10 minutes', so it is running.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.