This CKA practice question tests your understanding of cluster architecture, installation and configuration. 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 developer created a ServiceAccount named 'app-sa' in the 'dev' namespace. They want a pod to use this ServiceAccount. Which field in the pod spec should be set?
spec.serviceAccount
Why wrong: Deprecated, use serviceAccountName.
spec.authentication.serviceAccount
Why wrong: Invalid path.
spec.serviceAccountName
Correct field.
spec.accountName
Why wrong: No such field.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
spec.serviceAccountName
Option C is correct because the `spec.serviceAccountName` field in a Pod spec is the standard way to assign a specific ServiceAccount to a Pod. When this field is set, the Pod's containers will use the token of that ServiceAccount for API authentication. If omitted, the Pod defaults to the `default` ServiceAccount in its namespace.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
spec.serviceAccount
Why it's wrong here
Deprecated, use serviceAccountName.
spec.authentication.serviceAccount
Why it's wrong here
Invalid path.
spec.serviceAccountName
Why this is correct
Correct field.
Related concept
Read the scenario before looking for a memorised answer.
spec.accountName
Why it's wrong here
No such field.
Common exam traps
The trap here is that candidates may confuse the deprecated `spec.serviceAccount` field (which still works in older clusters but is removed in recent versions) with the correct `spec.serviceAccountName`, or invent a non-existent field like `spec.accountName` due to similarity with other Kubernetes resource specs.
Detailed technical explanation
Under the hood, when a Pod is created with `spec.serviceAccountName` set, the kubelet mounts a projected volume containing the ServiceAccount's JWT token (or a token from a TokenRequest API) into the Pod at `/var/run/secrets/kubernetes.io/serviceaccount`. This token is used by the Pod's containers to authenticate to the Kubernetes API server. A subtle behavior is that if the ServiceAccount is deleted after the Pod is running, the Pod continues to work with the cached token until it is restarted.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKA 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.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: spec.serviceAccountName — Option C is correct because the `spec.serviceAccountName` field in a Pod spec is the standard way to assign a specific ServiceAccount to a Pod. When this field is set, the Pod's containers will use the token of that ServiceAccount for API authentication. If omitted, the Pod defaults to the `default` ServiceAccount in its namespace.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA 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 CKA exam.
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