Question 260 of 928

Design and implement build and release pipelines →mediumMultiple ChoiceObjective-mapped

Required Service Principal Role for AKS Authentication in GitHub Actions

This AZ-400 practice question tests your understanding of design and implement build and release pipelines. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Your organization uses GitHub Actions for CI/CD. You have a workflow that builds and deploys a containerized application to Azure Kubernetes Service (AKS). The workflow uses the 'azure/aks-set-context' action to connect to the AKS cluster. Recently, the workflow started failing with authentication errors. The service principal used has Contributor role on the AKS cluster. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The service principal must have 'Owner' role on the resource group containing the AKS cluster.
Why wrong: Owner is not required; cluster admin role is sufficient.
B
The service principal lacks the 'Azure Kubernetes Service Cluster Admin Role' on the AKS cluster.
This role is required to fetch admin credentials.
C
The workflow uses an incorrect Kubernetes version.
Why wrong: Version mismatch would cause different errors.
D
The AKS cluster has RBAC disabled, causing authentication failures.
Why wrong: RBAC disabled does not affect service principal authentication.

Full breakdown with real-world context →

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 principal lacks the 'Azure Kubernetes Service Cluster Admin Role' on the AKS cluster.

The 'azure/aks-set-context' action requires the service principal to have the 'Azure Kubernetes Service Cluster Admin Role' (or 'Azure Kubernetes Service Cluster User Role') on the AKS cluster to authenticate and set the kubectl context. The Contributor role on the AKS cluster resource does not grant the necessary Kubernetes RBAC permissions to interact with the cluster's API server. Without the specific AKS role, the action fails with authentication errors.

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 principal must have 'Owner' role on the resource group containing the AKS cluster.
Why it's wrong here
Owner is not required; cluster admin role is sufficient.
✓
The service principal lacks the 'Azure Kubernetes Service Cluster Admin Role' on the AKS cluster.
Why this is correct
This role is required to fetch admin credentials.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The workflow uses an incorrect Kubernetes version.
Why it's wrong here
Version mismatch would cause different errors.
✗
The AKS cluster has RBAC disabled, causing authentication failures.
Why it's wrong here
RBAC disabled does not affect service principal authentication.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume the Contributor role on the AKS resource is sufficient for all operations, but Azure separates Azure RBAC (for managing the AKS resource) from Kubernetes RBAC (for interacting with the cluster), and the 'azure/aks-set-context' action specifically requires the AKS Cluster Admin or User Role.

Detailed technical explanation

How to think about this question

The 'azure/aks-set-context' action uses the Azure CLI's 'az aks get-credentials' command under the hood, which requires the service principal to have the 'Microsoft.ContainerService/managedClusters/listClusterUserCredential/action' permission. This permission is granted by the 'Azure Kubernetes Service Cluster User Role' or 'Admin Role' on the cluster, not by Contributor. In real-world scenarios, if the service principal has Contributor but not the AKS-specific role, the action can authenticate to Azure but fails to retrieve cluster credentials, resulting in a 401 Unauthorized error from the AKS API server.

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.

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.

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FAQ

Questions learners often ask

What does this AZ-400 question test?

Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The service principal lacks the 'Azure Kubernetes Service Cluster Admin Role' on the AKS cluster. — The 'azure/aks-set-context' action requires the service principal to have the 'Azure Kubernetes Service Cluster Admin Role' (or 'Azure Kubernetes Service Cluster User Role') on the AKS cluster to authenticate and set the kubectl context. The Contributor role on the AKS cluster resource does not grant the necessary Kubernetes RBAC permissions to interact with the cluster's API server. Without the specific AKS role, the action fails with authentication errors.

What should I do if I get this AZ-400 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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