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.
You need to create a ConfigMap named 'app-config' from a file 'config.properties'. Which kubectl command should you use?
Option C is correct because `kubectl create configmap app-config --from-file=config.properties` reads the file `config.properties` and creates a ConfigMap named `app-config` with a data key equal to the filename (`config.properties`) and the value set to the file's contents. This is the standard way to create a ConfigMap from a single file in Kubernetes.
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.
--from-env-file is for environment files with key=value format, not for arbitrary config 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 the entire file as a single key) with `--from-env-file` (which parses key-value pairs from a file), leading them to choose option D when they intend to import a properties file as a whole, or option B when they think `--from-literal` can accept a file path.
Detailed technical explanation
How to think about this question
Under the hood, `--from-file` reads the file's content and stores it as a single entry in the ConfigMap's `data` field, with the key defaulting to the filename (or basename). If the file contains multiple lines or key-value pairs, they are stored as a single string, not parsed; for structured data like properties files, you may need to use `--from-env-file` if you want each property as a separate key, or use `--from-file` with a custom key via `--from-file=<key>=<filename>`. In real-world scenarios, this distinction matters when ConfigMaps are mounted as volumes or consumed as environment variables, as the format affects how applications read the data.
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 `kubectl create configmap app-config --from-file=config.properties` reads the file `config.properties` and creates a ConfigMap named `app-config` with a data key equal to the filename (`config.properties`) and the value set to the file's contents. This is the standard way to create a ConfigMap from a single file in Kubernetes.
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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