This CKS practice question tests your understanding of cluster setup and hardening. 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 methods to disable automount of service account tokens for a pod?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set automountServiceAccountToken: false in the ServiceAccount YAML
Option C is correct because setting `automountServiceAccountToken: false` in the ServiceAccount YAML disables automatic mounting of the service account token for all pods that use that ServiceAccount. This is a declarative way to prevent the Kubernetes API server from injecting the token volume into pods, which is a key security hardening step to reduce the attack surface from compromised pods.
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 --service-account-issuer flag on API server
Why it's wrong here
This flag configures the service account issuer, not automount.
✗
Set env: - name: KUBERNETES_SERVICE_ACCOUNT_TOKEN to false
Why it's wrong here
No such environment variable exists.
✓
Set automountServiceAccountToken: false in the ServiceAccount YAML
Why this is correct
Correct service account level setting.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set spec.automountServiceAccountToken: false in the Pod spec
Why this is correct
Correct pod-level setting.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use the 'default' service account with automount disabled
Why this is correct
You can modify the default service account to disable automount, affecting all pods using it.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between the Pod spec field (`spec.automountServiceAccountToken`) and the ServiceAccount field, and candidates may incorrectly think that environment variables or API server flags can disable token mounting, when only the `automountServiceAccountToken` boolean field in the Pod or ServiceAccount spec is valid.
Detailed technical explanation
How to think about this question
Under the hood, when `automountServiceAccountToken` is set to `false` in the Pod spec or ServiceAccount, the kubelet skips adding the projected volume (or secret volume for legacy tokens) that contains the service account token. This is critical in multi-tenant clusters or when running untrusted workloads, as it prevents a compromised container from using the token to authenticate to the Kubernetes API server. The setting can be overridden at the Pod level even if the ServiceAccount has it enabled, giving fine-grained control.
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.
Cluster Setup and Hardening — This question tests Cluster Setup and Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set automountServiceAccountToken: false in the ServiceAccount YAML — Option C is correct because setting `automountServiceAccountToken: false` in the ServiceAccount YAML disables automatic mounting of the service account token for all pods that use that ServiceAccount. This is a declarative way to prevent the Kubernetes API server from injecting the token volume into pods, which is a key security hardening step to reduce the attack surface from compromised pods.
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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