CKAD Practice Question: Application Environment, Configuration and Security
This CKAD practice question tests your understanding of application environment, configuration and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 kubectl command creates a ConfigMap named 'app-config' from a file called 'config.properties'?
Option C is correct because the `kubectl create configmap` command with the `--from-file` flag directly creates a ConfigMap from the contents of a specified file, using the filename as the key and the file content as the value. This is the standard method for creating a ConfigMap from a single file like 'config.properties'.
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.
Correct. The --from-file flag creates a ConfigMap from the file content.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl apply -f config.properties
Why it's wrong here
Incorrect. kubectl apply is for applying YAML/JSON manifests, not for creating ConfigMaps directly from files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `--from-file` (which imports a file as a single data entry) with `--from-env-file` (which parses a file as multiple key-value pairs), leading them to choose Option A incorrectly.
Detailed technical explanation
How to think about this question
When using `--from-file=config.properties`, kubectl reads the entire file content and stores it under the key 'config.properties' in the ConfigMap's `data` field. This is useful for configuration files that are not in key-value format, such as application properties or JSON configs. Under the hood, ConfigMaps are stored in etcd as key-value pairs, and the `--from-file` flag simplifies the process of injecting file-based configuration into pods without manual encoding.
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 CKAD 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl create configmap app-config --from-file=config.properties — Option C is correct because the `kubectl create configmap` command with the `--from-file` flag directly creates a ConfigMap from the contents of a specified file, using the filename as the key and the file content as the value. This is the standard method for creating a ConfigMap from a single file like 'config.properties'.
What should I do if I get this CKAD 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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Question Discussion
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