- A
The command is invalid because 'system:serviceaccount' is not a valid user
Why wrong: The syntax is correct for impersonating a service account.
- B
The service account 'sa1' does not exist
Why wrong: If the service account did not exist, the command would return an error, not 'no'.
- C
The service account 'sa1' does not have permission to create pods in the default namespace
The kubectl auth can-i command checks whether a user or service account can perform an action. 'no' means insufficient permissions.
- D
The service account 'sa1' is not allowed to perform any actions
Why wrong: The command only checks the specified action; it does not imply a blanket denial.
Question 703 of 997
kubectl auth can-i
This CKS practice question tests your understanding of minimize microservice vulnerabilities. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
You run 'kubectl auth can-i create pods --as=system:serviceaccount:default:sa1 -n default' and get 'no'. What does this mean?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The service account 'sa1' does not have permission to create pods in the default namespace
The command 'kubectl auth can-i create pods --as=system:serviceaccount:default:sa1 -n default' impersonates the service account 'sa1' to check if it has RBAC permissions to create pods in the 'default' namespace. A response of 'no' means that the current RBAC bindings (Role/ClusterRole and RoleBinding/ClusterRoleBinding) do not grant the 'create' verb on 'pods' resources to that service account. This is a direct authorization check against the Kubernetes RBAC system, not an indication of the service account's existence or general capability.
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 command is invalid because 'system:serviceaccount' is not a valid user
Why it's wrong here
The syntax is correct for impersonating a service account.
- ✗
The service account 'sa1' does not exist
Why it's wrong here
If the service account did not exist, the command would return an error, not 'no'.
- ✓
The service account 'sa1' does not have permission to create pods in the default namespace
Why this is correct
The kubectl auth can-i command checks whether a user or service account can perform an action. 'no' means insufficient permissions.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The service account 'sa1' is not allowed to perform any actions
Why it's wrong here
The command only checks the specified action; it does not imply a blanket denial.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may mistake the 'no' response as meaning the service account is missing or invalid, but 'kubectl auth can-i' does not verify existence; it only tests RBAC authorization rules.
Trap categories for this question
Command / output trap
If the service account did not exist, the command would return an error, not 'no'.
Detailed technical explanation
How to think about this question
Under the hood, 'kubectl auth can-i' sends a SelfSubjectAccessReview (or SubjectAccessReview when impersonating) to the Kubernetes API server, which evaluates the request against all applicable RBAC rules. The response is purely based on RBAC policy; if no Role or ClusterRole binding grants the 'create' verb on 'pods' to the service account, the result is 'no', even if the service account exists. A real-world scenario is debugging a pod that fails to start due to missing permissions—this command helps isolate whether RBAC is the issue without actually creating resources.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Minimize Microservice Vulnerabilities — study guide chapter
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FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The service account 'sa1' does not have permission to create pods in the default namespace — The command 'kubectl auth can-i create pods --as=system:serviceaccount:default:sa1 -n default' impersonates the service account 'sa1' to check if it has RBAC permissions to create pods in the 'default' namespace. A response of 'no' means that the current RBAC bindings (Role/ClusterRole and RoleBinding/ClusterRoleBinding) do not grant the 'create' verb on 'pods' resources to that service account. This is a direct authorization check against the Kubernetes RBAC system, not an indication of the service account's existence or general capability.
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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Last reviewed: Jul 4, 2026
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