StudyToCert

All certifications / CKAD / Lessons

Certified Kubernetes Application Developer CKAD (Kubernetes v1.35 curriculum) · Domain 5: Services and Networking

Selectors, port vs targetPort vs nodePort, named ports

▶ Watch the overview video

Last reviewed September 25, 2026 · Leer en español

Two things decide whether a Service works: its selector must match the right Pods, and its port numbers must line up with where the application actually listens. Most Service bugs on the exam are one or the other.

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