CKS Minimize Microservice Vulnerabilities Practice Question
This CKS practice question tests your understanding of minimize microservice vulnerabilities. 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 TWO of the following are effective measures to minimize the impact of a compromised microservice container in a Kubernetes cluster? (Choose two.)
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
✓
Set resource limits (CPU/memory) on the container
Setting resource limits (CPU/memory) on a container is correct because it prevents a compromised microservice from consuming excessive cluster resources, which could lead to a denial-of-service (DoS) attack against other workloads. By enforcing limits via the container's cgroup constraints, the kernel throttles or OOM-kills the container if it exceeds its allocated resources, containing the blast radius of the compromise.
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.
✓
Set resource limits (CPU/memory) on the container
Why this is correct
Resource limits prevent a compromised container from exhausting cluster resources.
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.
✗
Set the container's root filesystem as read-only
Why it's wrong here
Read-only filesystem prevents malware installation but does not limit lateral movement.
✓
Apply a NetworkPolicy that restricts egress traffic to only necessary services
Why this is correct
Network policies limit the ability of a compromised container to communicate with other services.
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.
✗
Run the container as root to simplify debugging
Why it's wrong here
Running as root increases the blast radius if the container is compromised.
✗
Use hostNetwork: true to share the host's network namespace
Why it's wrong here
HostNetwork exposes the host's network stack, increasing the attack surface.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between preventive controls (e.g., read-only filesystem, non-root user) and impact-minimization controls (e.g., resource limits, network policies), and candidates mistakenly choose read-only filesystem as an impact-minimization measure when it is actually a preventive measure.
Detailed technical explanation
How to think about this question
Resource limits are enforced by the Linux cgroup v2 controller, which throttles CPU via the CFS scheduler and triggers an OOM kill when memory exceeds the limit. In a real-world scenario, a compromised container running a cryptominer could saturate CPU and memory; without limits, it would starve other pods on the same node, but with limits, it is killed or throttled, preserving cluster stability. The OOM killer selects the offending container based on its oom_score_adj, which Kubernetes sets automatically for pods with memory limits.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set resource limits (CPU/memory) on the container — Setting resource limits (CPU/memory) on a container is correct because it prevents a compromised microservice from consuming excessive cluster resources, which could lead to a denial-of-service (DoS) attack against other workloads. By enforcing limits via the container's cgroup constraints, the kernel throttles or OOM-kills the container if it exceeds its allocated resources, containing the blast radius of the compromise.
What should I do if I get this CKS 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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