- A
docker inspect web
Why wrong: docker inspect shows detailed configuration but not necessarily the logs of why the container exited.
- B
docker exec -it web bash
Why wrong: docker exec cannot be used on a stopped container.
- C
docker logs -f web
docker logs -f web streams the logs, revealing any errors during startup.
Question 797 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.
A developer runs 'docker run -d -p 8080:80 --name web nginx:alpine'. The container fails to start. Which command is the most appropriate to investigate the issue?
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.
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
✓
docker logs -f web
Option C is correct because `docker logs -f web` streams the container's stdout and stderr output, which typically contains the error message explaining why the container failed to start (e.g., port conflict, missing configuration, or process crash). Since the container is not running, `docker logs` is the primary diagnostic tool to retrieve its exit logs without requiring the container to be active.
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.
- ✗
docker inspect web
Why it's wrong here
docker inspect shows detailed configuration but not necessarily the logs of why the container exited.
- ✗
docker exec -it web bash
Why it's wrong here
docker exec cannot be used on a stopped container.
- ✓
docker logs -f web
Why this is correct
docker logs -f web streams the logs, revealing any errors during startup.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between `docker inspect` (metadata) and `docker logs` (runtime output), and the trap here is that candidates assume `docker inspect` shows error messages, but it only shows configuration and state, not application logs.
Trap categories for this question
Command / output trap
docker inspect shows detailed configuration but not necessarily the logs of why the container exited.
Detailed technical explanation
How to think about this question
When a container exits immediately, Docker captures its stdout/stderr output in a log buffer accessible via `docker logs`. The `-f` flag (follow) is useful for real-time streaming, but even without it, `docker logs` retrieves the historical output. Under the hood, Docker uses a logging driver (default: json-file) that writes logs to a JSON file on the host, and `docker logs` reads this file. In real-world scenarios, a common failure is a port conflict (e.g., host port 8080 already in use), which would be logged as 'bind: address already in use'.
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.
- →
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: docker logs -f web — Option C is correct because `docker logs -f web` streams the container's stdout and stderr output, which typically contains the error message explaining why the container failed to start (e.g., port conflict, missing configuration, or process crash). Since the container is not running, `docker logs` is the primary diagnostic tool to retrieve its exit logs without requiring the container to be active.
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.
Are there clue words in this question I should notice?
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.
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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