EX280 Troubleshooting And Diagnostics Practice Question
An administrator suspects that a memory leak in a system daemon on an RHCOS worker node is causing system instability. Which THREE commands or log sources can be examined via an oc debug node session to investigate system memory consumption? (Choose THREE)
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
✓
chroot /host top -b -n 1
Running 'top', 'free -h', and checking journald kernel logs via oc debug node inspects host memory usage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
chroot /host top -b -n 1
Why this is correct
Dumps process memory and CPU statistics on the host.
- ✗
oc get pvc
Why it's wrong here
PVCs are storage claims, unrelated to host memory leaks.
- ✗
oc adm cluster-status
Why it's wrong here
Cluster-status is not a valid OpenShift command.
- ✓
journalctl -k -e
Why this is correct
Inspects kernel ring buffer logs for OOM killer invocations and memory allocation failures.
- ✓
chroot /host free -h
Why this is correct
Displays total, used, and available physical and swap memory on the node.
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.