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.
A pod in namespace 'ns1' has automountServiceAccountToken: false. However, the container still has a mounted service account token at /var/run/secrets/kubernetes.io/serviceaccount. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The automountServiceAccountToken field is set in the container spec instead of the pod spec
The `automountServiceAccountToken` field is a pod-level setting. If it is set to `false` in the pod spec, the kubelet will not automatically mount the service account token. However, if the field is mistakenly set inside a container spec (which is not a valid field for containers), the pod-level setting is ignored, and the default behavior (mounting the token) applies. This is why the token still appears mounted despite the intention to disable it.
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.
✓
The automountServiceAccountToken field is set in the container spec instead of the pod spec
Why this is correct
The field is a pod-level field; setting it at the container level has no effect.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The kubelet is configured to always mount tokens
Why it's wrong here
There is no such kubelet configuration; the pod spec controls mounting.
✗
The namespace has a default automountServiceAccountToken: true
Why it's wrong here
The pod-level setting overrides the namespace default; if pod spec says false, it should not mount.
✗
The pod is using a custom service account with automountServiceAccountToken: true
Why it's wrong here
The pod-level setting overrides the service account setting.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume setting `automountServiceAccountToken: false` anywhere in the pod YAML will work, but they overlook that it must be at the pod spec level, not inside a container definition.
Detailed technical explanation
How to think about this question
Under the hood, the `automountServiceAccountToken` field is defined in the PodSpec (v1 core API) and is not a valid field in the ContainerSpec. When the API server processes a pod, it checks the pod-level field; if missing, it falls back to the service account's setting, then to the namespace's default. If a candidate mistakenly places the field in the container spec, the API server ignores it, and the default behavior (mounting the token) applies. This is a common misconfiguration in YAML manifests where users confuse pod-level and container-level fields.
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: The automountServiceAccountToken field is set in the container spec instead of the pod spec — The `automountServiceAccountToken` field is a pod-level setting. If it is set to `false` in the pod spec, the kubelet will not automatically mount the service account token. However, if the field is mistakenly set inside a container spec (which is not a valid field for containers), the pod-level setting is ignored, and the default behavior (mounting the token) applies. This is why the token still appears mounted despite the intention to disable it.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This CKS practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.