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 want to enforce that all pods in a namespace have a minimum memory request of 100Mi and a maximum memory limit of 1Gi. Which resource should you create?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LimitRange
A LimitRange (option D) is the correct resource because it allows you to set default, minimum, and maximum resource constraints (CPU/memory) at the namespace level, which are enforced per pod or container. In this case, you can define a LimitRange with a `min` of 100Mi and a `max` of 1Gi for memory, ensuring every pod in the namespace adheres to these bounds.
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.
✗
PodSecurityPolicy
Why it's wrong here
PodSecurityPolicy is deprecated and does not control resource limits.
✗
LimitRange with limits:
- max:
memory: 128Mi
min:
memory: 100Mi
Why it's wrong here
'128Mi' is less than 100Mi; the constraint is invalid. Also the desired max is 1Gi.
✗
ResourceQuota
Why it's wrong here
ResourceQuota sets aggregate limits for the namespace, not per-pod min/max.
✓
LimitRange
Why this is correct
LimitRange allows setting min/max resource constraints for pods/containers in a namespace.
Clue confirmation
The clue word "minimum / minimize" 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
The trap here is that candidates confuse ResourceQuota (which sets namespace-wide totals) with LimitRange (which sets per-pod constraints), or they misconfigure the LimitRange with incorrect `max`/`min` values that don't match the requirement.
Detailed technical explanation
How to think about this question
A LimitRange operates by mutating pod specs at admission time via the LimitRanger admission controller, injecting default resource requests/limits if not specified, and validating that each container's requests/limits fall within the defined range. Under the hood, the `max` and `min` fields in a LimitRange enforce hard boundaries—any pod exceeding `max` or falling below `min` is rejected—while `default` and `defaultRequest` provide fallback values. In real-world scenarios, this is critical for preventing runaway resource usage in multi-tenant clusters where individual pods must be constrained without affecting the overall namespace quota.
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: LimitRange — A LimitRange (option D) is the correct resource because it allows you to set default, minimum, and maximum resource constraints (CPU/memory) at the namespace level, which are enforced per pod or container. In this case, you can define a LimitRange with a `min` of 100Mi and a `max` of 1Gi for memory, ensuring every pod in the namespace adheres to these bounds.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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