CKS Monitoring Logging and Runtime Security Practice Question
This CKS practice question tests your understanding of monitoring logging and runtime security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An auditor requires that all audit logs from the Kubernetes API server be stored for 90 days and be tamper-proof. Which TWO measures should be implemented?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the audit log backend to write to an immutable object store like S3 with Object Lock
Option A is correct because storing audit logs in an immutable object store like S3 with Object Lock ensures tamper-proof retention by preventing any object from being overwritten or deleted for a specified retention period. This directly satisfies the auditor's requirement for logs that cannot be altered or destroyed, regardless of the Kubernetes cluster state.
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.
✓
Configure the audit log backend to write to an immutable object store like S3 with Object Lock
Why this is correct
Immutable storage prevents log modification or deletion.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable the AuditDynamicConfiguration feature gate
Why it's wrong here
This allows dynamic reconfiguration but does not address retention or tamper-proofing.
✗
Deploy Fluentd to forward logs to a central Elasticsearch cluster
Why it's wrong here
Forwarding does not guarantee immutability.
✓
Set the API server flag --audit-log-maxage=90
Why this is correct
This sets the retention period for audit log files.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set --audit-log-maxbackup=10 and --audit-log-maxsize=100
Why it's wrong here
These flags control rotation, not retention duration or tamper-proofing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between log rotation/retention settings (like --audit-log-maxage) and true immutability features, leading candidates to incorrectly select options that only manage log file age without preventing tampering.
Detailed technical explanation
How to think about this question
S3 Object Lock uses a Write-Once-Read-Many (WORM) model, where each object version can have a retention mode (Governance or Compliance) and a retention period. In Compliance mode, even root users cannot delete the object until the retention period expires, making it ideal for audit log immutability. The --audit-log-maxage flag sets the maximum number of days to retain old audit log files, but it only applies to the local file backend and does not provide tamper-proof guarantees.
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 CKS 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 CKS question in full detail.
Monitoring Logging and Runtime Security — This question tests Monitoring Logging and Runtime Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the audit log backend to write to an immutable object store like S3 with Object Lock — Option A is correct because storing audit logs in an immutable object store like S3 with Object Lock ensures tamper-proof retention by preventing any object from being overwritten or deleted for a specified retention period. This directly satisfies the auditor's requirement for logs that cannot be altered or destroyed, regardless of the Kubernetes cluster state.
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.
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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