EX280 Cluster Installation And Management Practice Question
An administrator needs to modify the SSH key used for debugging worker nodes across an OpenShift 4.14 cluster. Which resource type should the administrator edit or create to apply this change cluster-wide to all worker nodes?
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
✓
Create or modify a MachineConfig object that targets the worker role and specifies the sshKey field.
MachineConfig objects allow administrators to manage node-level configuration changes, including injecting authorized SSH keys for the core user.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Modify the ClusterVersion custom resource spec field.
Why it's wrong here
The ClusterVersion resource controls the release version and channel of the OpenShift cluster, not node SSH keys.
- ✗
Edit the kubelet configuration map in the kube-system namespace.
Why it's wrong here
Kubelet configurations are managed via KubeletConfig custom resources, not direct ConfigMap edits, and SSH keys are handled via MachineConfig.
- ✗
Update the authentication.config.openshift.io cluster operator resource.
Why it's wrong here
The authentication cluster operator manages cluster-wide user authentication mechanisms, not node-level SSH access.
- ✓
Create or modify a MachineConfig object that targets the worker role and specifies the sshKey field.
Why this is correct
MachineConfig resources are specifically designed by the Machine Config Operator to deliver OS-level settings like SSH keys.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Red Hat exam blueprint
This EX280 practice question is part of Courseiva's free Red Hat certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the EX280 exam.