CKA Practice Question: Cluster Architecture, Installation and Configuration
This CKA practice question tests your understanding of cluster architecture, installation and configuration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 configure a pod to use a specific ServiceAccount? (Select THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set spec.serviceAccountName in the pod spec
Option B is correct because setting `spec.serviceAccountName` in a Pod spec directly assigns a specific ServiceAccount to that Pod. When the Pod is created, the API server uses this field to bind the ServiceAccount's token and permissions to the Pod's containers, overriding the default 'default' ServiceAccount in the namespace.
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.
✗
Create a ClusterRoleBinding that binds the ServiceAccount to a ClusterRole
Why it's wrong here
This grants permissions, but does not configure the pod to use the ServiceAccount.
✓
Set spec.serviceAccountName in the pod spec
Why this is correct
Directly sets the ServiceAccount for the pod.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set spec.template.spec.serviceAccountName in a Deployment
Why this is correct
Sets ServiceAccount for pods created by the Deployment.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set automountServiceAccountToken: false and manually mount the token as a volume
Why this is correct
Allows custom token mounting.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the serviceAccount field in the pod spec
Why it's wrong here
serviceAccount is deprecated; use serviceAccountName.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the deprecated `serviceAccount` field (which still exists in older documentation) with the correct `serviceAccountName` field, or think that a ClusterRoleBinding directly assigns a ServiceAccount to a Pod, when it only grants permissions to that ServiceAccount.
Detailed technical explanation
How to think about this question
Under the hood, when `spec.serviceAccountName` is set, the kubelet mounts the ServiceAccount's projected token volume (typically at `/var/run/secrets/kubernetes.io/serviceaccount`) into each container. The token is a JWT signed by the API server, used for authenticating Pod-to-API-server requests. In real-world scenarios, you might use a non-default ServiceAccount to grant fine-grained RBAC permissions, such as read-only access to a specific namespace, without giving the Pod cluster-wide privileges.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set spec.serviceAccountName in the pod spec — Option B is correct because setting `spec.serviceAccountName` in a Pod spec directly assigns a specific ServiceAccount to that Pod. When the Pod is created, the API server uses this field to bind the ServiceAccount's token and permissions to the Pod's containers, overriding the default 'default' ServiceAccount in the namespace.
What should I do if I get this CKA 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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