SC-100 Design security for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security for infrastructure. 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.
A company uses Azure Kubernetes Service (AKS) with Azure Active Directory (Azure AD) integration. They want to restrict developers to only be able to create and manage pods and services, but not modify cluster-level resources like nodes or namespaces. What should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a custom ClusterRole with rules for pods and services, then bind it to the developer group with a ClusterRoleBinding
Option B is correct because Kubernetes RBAC allows fine-grained authorization. A custom ClusterRole can define rules for pods and services (core API group resources), and a ClusterRoleBinding binds it to the developer group across all namespaces. This grants the required permissions without allowing modifications to cluster-level resources like nodes or namespaces, which are not included in the custom role's rules.
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.
✗
Assign the cluster-admin ClusterRole to the developers
Why it's wrong here
Cluster-admin provides full cluster access.
✓
Create a custom ClusterRole with rules for pods and services, then bind it to the developer group with a ClusterRoleBinding
Why this is correct
This grants cluster-wide but limited access to only specified resources.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a RoleBinding in each namespace for developers
Why it's wrong here
RoleBinding only grants access within a namespace, not cluster-wide services.
✗
Use Azure RBAC to grant Contributor role on the AKS cluster
Why it's wrong here
Azure RBAC controls Azure resource management, not Kubernetes API access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse namespace-scoped RoleBindings with cluster-scoped ClusterRoleBindings, or mistakenly think that Azure RBAC's Contributor role provides the same granularity as Kubernetes RBAC, when in fact it grants overly broad permissions that include cluster-level modifications.
Detailed technical explanation
How to think about this question
Kubernetes RBAC uses Role and ClusterRole objects to define permissions; a ClusterRole is non-namespaced and can be bound to subjects via ClusterRoleBinding (cluster-wide) or RoleBinding (namespace-scoped). The core API group (v1) includes pods and services, while nodes and namespaces are cluster-scoped resources that require explicit rules in a ClusterRole to access. A custom ClusterRole that omits rules for nodes, namespaces, PersistentVolumes, and other cluster-scoped resources effectively prevents developers from modifying them, even if bound cluster-wide.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-100 question in full detail.
Design security for infrastructure — This question tests Design security for infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a custom ClusterRole with rules for pods and services, then bind it to the developer group with a ClusterRoleBinding — Option B is correct because Kubernetes RBAC allows fine-grained authorization. A custom ClusterRole can define rules for pods and services (core API group resources), and a ClusterRoleBinding binds it to the developer group across all namespaces. This grants the required permissions without allowing modifications to cluster-level resources like nodes or namespaces, which are not included in the custom role's rules.
What should I do if I get this SC-100 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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