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 of the following is the correct way to set a CPU request of 250 millicores and a memory limit of 512 Mi in a container?
Option D is correct because in Kubernetes, CPU requests are specified in millicores (e.g., 250m) and memory limits use binary units like Mi (Mebibytes). The value '250m' equals 0.25 CPU cores, and '512Mi' is 512 Mebibytes (512 * 1024^2 bytes), which is the standard unit for memory limits.
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. '250m' means 250 millicores, and '512Mi' means 512 mebibytes.
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 the 'M' (Megabyte, decimal) and 'Mi' (Mebibyte, binary) suffixes, or forget that CPU values without 'm' are interpreted as whole cores, leading to accidentally requesting 250 CPUs instead of 0.25.
Detailed technical explanation
How to think about this question
Kubernetes uses millicores (m) for CPU requests to allow fractional CPU allocation; 1000m equals 1 vCPU core. For memory, Kubernetes distinguishes between binary units (Mi, Gi) and decimal units (M, G); '512Mi' equals 512 * 1024^2 bytes (536,870,912 bytes), while '512M' equals 512 * 1000^2 bytes (512,000,000 bytes), a difference of about 24.9 MB. This distinction matters in resource-constrained environments where accurate memory accounting prevents OOM kills.
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: resources:
requests:
cpu: 250m
limits:
memory: 512Mi — Option D is correct because in Kubernetes, CPU requests are specified in millicores (e.g., 250m) and memory limits use binary units like Mi (Mebibytes). The value '250m' equals 0.25 CPU cores, and '512Mi' is 512 Mebibytes (512 * 1024^2 bytes), which is the standard unit for memory limits.
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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