1Z0-997-26 Cloud Native Architecture Practice Question
You are troubleshooting a microservice on OKE that is experiencing intermittent 502 Bad Gateway errors when communicating with another internal service. The application uses Kubernetes ClusterIP services for discovery. You suspect DNS resolution failure within the cluster. Which diagnostic tool and approach should you use inside the OKE cluster?
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
✓
Deploy a temporary diagnostic container pod (such as netshoot) and test DNS resolution using nslookup against CoreDNS.
Deploying a temporary diagnostic pod (e.g., netshoot or busybox) and running DNS queries via CoreDNS/kube-dns helps diagnose in-cluster DNS and service connectivity issues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the OCI VCN internet gateway route table.
Why it's wrong here
Incorrect. Internal pod-to-pod communication within a Kubernetes cluster uses internal cluster networking (CNI/kube-proxy), not the VCN internet gateway.
- ✓
Deploy a temporary diagnostic container pod (such as netshoot) and test DNS resolution using nslookup against CoreDNS.
Why this is correct
Correct. Using a diagnostic pod with networking tools allows direct testing of internal Kubernetes DNS and service endpoints.
- ✗
Review OCI Cloud Guard threat detection policies.
Why it's wrong here
Incorrect. Cloud Guard does not debug in-cluster microservice DNS errors.
- ✗
Restart the OCI API Gateway service.
Why it's wrong here
Incorrect. Internal pod-to-pod ClusterIP traffic does not traverse API Gateway.
Visual reference
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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 Oracle exam blueprint
This 1Z0-997-26 practice question is part of Courseiva's free Oracle 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 1Z0-997-26 exam.