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 of the following is a valid method to disable automatic mounting of service account tokens for a pod?
Why wrong: The token is automatically created and mounted by the system; deleting the secret may cause errors.
B
Add 'automountServiceAccountToken: false' to the pod spec
This field in the pod spec disables token mounting for that pod.
C
Use a NetworkPolicy to block access to the token
Why wrong: NetworkPolicy cannot block mounting of secrets.
D
Set the service account's 'automountServiceAccountToken' field to false
Why wrong: The service account itself can have this field, but it applies to all pods using that service account. However, the pod spec can override it. The question asks for a method 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
✓
Add 'automountServiceAccountToken: false' to the pod spec
Option B is correct because setting `automountServiceAccountToken: false` in the pod spec explicitly disables the automatic mounting of the service account token into the pod. This is the most direct and granular way to prevent the token from being available inside the container, which is a key hardening step to reduce the attack surface if the pod does not need to interact with the Kubernetes API.
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.
✗
Delete the service account token secret
Why it's wrong here
The token is automatically created and mounted by the system; deleting the secret may cause errors.
✓
Add 'automountServiceAccountToken: false' to the pod spec
Why this is correct
This field in the pod spec disables token mounting for that pod.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a NetworkPolicy to block access to the token
Why it's wrong here
NetworkPolicy cannot block mounting of secrets.
✗
Set the service account's 'automountServiceAccountToken' field to false
Why it's wrong here
The service account itself can have this field, but it applies to all pods using that service account. However, the pod spec can override it. The question asks for a method for a pod.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between pod-level and service account-level settings, and candidates mistakenly choose the service account-level option (D) thinking it applies to all pods, but the pod-level setting (B) is the only one that directly and unconditionally disables mounting for that specific pod.
Detailed technical explanation
How to think about this question
The `automountServiceAccountToken` field is a boolean that, when set to `false` at the pod level, prevents the kubelet from mounting the projected service account token volume (typically at `/var/run/secrets/kubernetes.io/serviceaccount/token`). This is part of the PodSpec and is evaluated during pod creation; it does not affect already-running pods. In real-world scenarios, this is critical for pods that do not need API access, such as those running stateless web servers or batch jobs, to minimize the risk of token theft via container escape or compromised application code.
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: Add 'automountServiceAccountToken: false' to the pod spec — Option B is correct because setting `automountServiceAccountToken: false` in the pod spec explicitly disables the automatic mounting of the service account token into the pod. This is the most direct and granular way to prevent the token from being available inside the container, which is a key hardening step to reduce the attack surface if the pod does not need to interact with the Kubernetes API.
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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