Networking, Services and Discovery
Container orchestration questions often test Pod networking, Services, selectors, DNS, endpoints, Ingress, service mesh awareness, and connectivity layers.
How to study for Kubernetes and Cloud Native Associate
Treat each question as a foundation check: identify the Kubernetes primitive, connect it to the cloud native pattern, then choose the least surprising operational behavior.
Core concepts
Concept 1
Pod IPs are replaceable, while Services and DNS provide stable discovery for changing backend sets.
Exam cue: Follow a failed request through DNS, Service ports and selector, EndpointSlices, readiness, dataplane, and NetworkPolicy.
Concept 2
EndpointSlices represent current backends, readiness controls normal traffic eligibility, and the dataplane implements forwarding.
Exam cue: Separate Service port, targetPort, NodePort, and the application's actual listening port.
Concept 3
Ingress and Gateway APIs express layer-seven routes but require controllers and separate external DNS configuration.
Exam cue: Check whether a routing object has a supporting controller and an accepted attachment.
Risk pitfalls and guardrails
Assuming a Service creates or repairs its backend Pods.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Treating successful DNS resolution as proof that network policy and backend health allow the connection.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Expecting an Ingress resource alone to create public DNS or implement routing without a controller.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Memory anchors
Service
A Service provides a stable virtual endpoint for selected Pods.
ClusterIP
ClusterIP exposes a Service inside the cluster on an internal virtual IP.
Endpoint
An endpoint represents a ready backend selected by a Service.
CoreDNS
CoreDNS provides Kubernetes DNS resolution for Services and Pods.
Ingress
Ingress routes external HTTP or HTTPS traffic to Services through an ingress controller.
NetworkPolicy
NetworkPolicy controls allowed ingress or egress traffic for selected Pods.
Service Mesh
A service mesh adds traffic management, identity, policy, and telemetry through infrastructure sidecars or proxies.
Discovery
Service discovery lets workloads find other services through stable names instead of ephemeral Pod IPs.
EndpointSlice
EndpointSlices represent Service backend addresses, ports, and readiness conditions at scale.
Gateway API
Gateway API separates shared listeners from application routes through role-oriented traffic resources.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What address does a ClusterIP Service normally provide?
A Service has port: 80 and targetPort: 8080. What does this mean?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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