This CKS practice question tests your understanding of cluster setup and hardening. 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.
A ClusterRole named 'secret-reader' is defined with rules to get, list, and watch secrets. A RoleBinding in namespace 'app' binds this ClusterRole to a service account. Which of the following best describes the permissions of the service account?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 can get, list, and watch secrets only in the 'app' namespace.
A RoleBinding in a specific namespace grants the permissions defined in the referenced ClusterRole, but only within that namespace. Since the RoleBinding is in the 'app' namespace, the service account receives the get, list, and watch permissions for secrets only within the 'app' namespace, not cluster-wide. This is the standard behavior of RoleBinding when binding to a ClusterRole.
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 service account has no permissions because ClusterRole cannot be used with RoleBinding.
Why it's wrong here
ClusterRole can be used with RoleBinding to grant namespace-scoped permissions.
✗
The service account can only get secrets in the 'app' namespace.
Why it's wrong here
The ClusterRole includes list and watch as well.
✗
The service account can get, list, and watch secrets in all namespaces.
Why it's wrong here
That would require a ClusterRoleBinding, not a RoleBinding.
✓
The service account can get, list, and watch secrets only in the 'app' namespace.
Why this is correct
RoleBinding grants permissions only in its namespace.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse RoleBinding with ClusterRoleBinding, assuming that using a ClusterRole automatically grants cluster-wide permissions, when in fact the binding type determines the scope.
Detailed technical explanation
How to think about this question
Under the hood, a RoleBinding creates a binding entry in the RBAC authorizer that maps the subject (service account) to the ClusterRole's rules, but with a namespace scope. When the API server evaluates an authorization request, it checks the namespace of the resource against the binding's namespace; if they don't match, the request is denied. This design allows administrators to reuse a ClusterRole (e.g., 'secret-reader') across multiple namespaces without redefining the rules.
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 service account can get, list, and watch secrets only in the 'app' namespace. — A RoleBinding in a specific namespace grants the permissions defined in the referenced ClusterRole, but only within that namespace. Since the RoleBinding is in the 'app' namespace, the service account receives the get, list, and watch permissions for secrets only within the 'app' namespace, not cluster-wide. This is the standard behavior of RoleBinding when binding to a ClusterRole.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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