This CKA practice question tests your understanding of workloads & scheduling. 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 THREE of the following are valid considerations when using resource requests and limits? (Select 3)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Requests are used by the scheduler to decide which node can accommodate the Pod.
Option B is correct because the Kubernetes scheduler uses resource requests (CPU and memory) to determine node suitability for a Pod. The scheduler checks if the sum of requests for all Pods on a node, plus the new Pod's requests, is less than or equal to the node's allocatable capacity. Limits are not used for scheduling decisions.
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.
✗
Limits must be equal to requests for a Pod to be scheduled.
Why it's wrong here
Limits can be greater than or equal to requests.
✓
Requests are used by the scheduler to decide which node can accommodate the Pod.
Why this is correct
Scheduler uses requests to calculate node capacity.
Related concept
Read the scenario before looking for a memorised answer.
✗
CPU limits guarantee the Pod will get that amount of CPU.
Why it's wrong here
CPU is compressible; limits throttle, not guarantee.
✓
The QoS class is determined based on requests and limits.
Why this is correct
Guaranteed, Burstable, BestEffort based on request/limit configuration.
Related concept
Read the scenario before looking for a memorised answer.
✓
Memory limits can cause the Pod to be OOMKilled if exceeded.
Why this is correct
Memory is incompressible; exceeding limit leads to termination.
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 often confuse CPU limits as a guarantee of CPU allocation, when in fact CPU is compressible and limits only throttle usage, while memory limits are hard and can cause OOM kills.
Detailed technical explanation
How to think about this question
Under the hood, the kubelet enforces CPU limits using the Completely Fair Scheduler (CFS) quotas in cgroups, which throttle the Pod's CPU time when it exceeds the limit, but the Pod can still be scheduled with less. Memory limits are enforced via cgroups' memory limit, and if the Pod exceeds its memory limit, the kernel's OOM killer terminates the Pod (OOMKilled). The QoS class (Guaranteed, Burstable, BestEffort) is derived from the relationship between requests and limits: Guaranteed requires requests equal limits for all containers, Burstable has at least one container with requests less than limits, and BestEffort has no requests or limits set.
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 CKA 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 CKA question in full detail.
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Requests are used by the scheduler to decide which node can accommodate the Pod. — Option B is correct because the Kubernetes scheduler uses resource requests (CPU and memory) to determine node suitability for a Pod. The scheduler checks if the sum of requests for all Pods on a node, plus the new Pod's requests, is less than or equal to the node's allocatable capacity. Limits are not used for scheduling decisions.
What should I do if I get this CKA 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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