EX280 Networking And Network Policies Practice Question
An administrator needs to configure cluster-wide DNS forwarding for a specific custom domain (e.g., 'corp.local') to point to internal corporate DNS servers. Where is this configured in OpenShift 4.14?
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
✓
Edit the DNS resource named 'cluster' and add a spec.servers block with forwardPlugin rules.
Cluster-wide DNS forwarding is configured by modifying the DNS custom resource named 'cluster' to include a forwardPlugin rule.
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 /etc/resolv.conf file on every worker node.
Why it's wrong here
Node resolv.conf files are managed by systemd-resolved/NetworkManager and will be overwritten.
- ✗
Create a custom Route with DNS forwarding annotations.
Why it's wrong here
Routes deal with HTTP/HTTPS traffic ingress, not core cluster DNS server forwarding.
- ✓
Edit the DNS resource named 'cluster' and add a spec.servers block with forwardPlugin rules.
Why this is correct
The DNS operator provides the spec.servers configuration to forward queries for specific zones.
- ✗
Edit the Corefile ConfigMap directly in the 'kube-system' namespace.
Why it's wrong here
Manually editing the Corefile in kube-system is overwritten by the cluster DNS operator.
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.