CKA Practice Question: Cluster Architecture, Installation and Configuration
This CKA practice question tests your understanding of cluster architecture, installation and configuration. 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 have a ClusterRole named 'deployer' that allows creating Deployments and Services. You want to grant a ServiceAccount 'ci-cd' in namespace 'app' the permissions defined in this ClusterRole. Which TWO resources are needed? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The existing ClusterRole 'deployer'
Option A is correct because the ClusterRole 'deployer' already contains the necessary rules to allow creating Deployments and Services. You do not need to create a new ClusterRole; you can reuse the existing one. Option C is correct because a RoleBinding in namespace 'app' can reference a ClusterRole and bind it to a ServiceAccount within that namespace, granting the permissions only in that namespace. This is the standard method to grant cluster-scoped permissions to a namespaced subject.
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 existing ClusterRole 'deployer'
Why this is correct
The ClusterRole defines the permissions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new ClusterRole with the same rules
Why it's wrong here
The ClusterRole already exists; no need to create a new one.
✓
RoleBinding in namespace 'app' referencing ClusterRole 'deployer' and ServiceAccount 'ci-cd'
Why this is correct
A RoleBinding can reference a ClusterRole and grant its permissions within the binding's namespace.
Related concept
Read the scenario before looking for a memorised answer.
✗
ClusterRoleBinding with subject ServiceAccount 'ci-cd' in namespace 'app'
Why it's wrong here
A ClusterRoleBinding would grant permissions cluster-wide, not just in the 'app' namespace.
✗
A Secret for the ServiceAccount
Why it's wrong here
A Secret is for authentication, not authorization.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse RoleBinding and ClusterRoleBinding, thinking a ClusterRole must always be bound with a ClusterRoleBinding, but a RoleBinding can bind a ClusterRole to grant permissions only in a specific namespace.
Detailed technical explanation
How to think about this question
In Kubernetes RBAC, a RoleBinding can reference a ClusterRole to grant its permissions within a specific namespace. This is a common pattern to reuse cluster-scoped roles (e.g., 'view', 'edit') for namespaced subjects without creating duplicate roles. The RoleBinding binds the ClusterRole to a subject (like a ServiceAccount) and scopes the permissions to the RoleBinding's namespace. Under the hood, the RBAC authorizer checks the RoleBinding's namespace when evaluating requests, ensuring the ServiceAccount only has those permissions in that namespace.
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: The existing ClusterRole 'deployer' — Option A is correct because the ClusterRole 'deployer' already contains the necessary rules to allow creating Deployments and Services. You do not need to create a new ClusterRole; you can reuse the existing one. Option C is correct because a RoleBinding in namespace 'app' can reference a ClusterRole and bind it to a ServiceAccount within that namespace, granting the permissions only in that namespace. This is the standard method to grant cluster-scoped permissions to a namespaced subject.
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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