StudyToCert

All certifications / CKA / Lessons

Certified Kubernetes Administrator CKA (Kubernetes v1.35 curriculum) · Domain 5: Troubleshooting

Service and networking problems: selectors, readiness and EndpointSlices, kube-proxy, cross-node CNI traffic, sandbox network errors

▶ Watch the overview video

Last reviewed September 25, 2026 · Leer en español

Network problems feel mysterious until you follow the path a request takes: client Pod, DNS, Service virtual IP, kube-proxy rules, EndpointSlice, backend Pod, and the CNI network between nodes. Check each hop in order and the fault usually becomes obvious.

Free account

Keep reading for free

Create a free StudyToCert account to read the rest of this lesson: 6 more sections, 4 key terms, a real-world example, an exam tip and self-check questions. Every lesson, lab and practice test is free with an account.

Sign up free Log in

Study CKA for free
A week-by-week plan with every lesson, quizzes, checkpoint tests, a practice exam and hands-on labs.
Open the CKA study plan