KCNA Container Orchestration Practice Question
When using a Service of type ClusterIP, how do pods reach the service?
⚠ Common exam trap
CNCF often tests the misconception that ClusterIP Services are only reachable from within the same pod or node, when in fact they are reachable from any pod in the cluster (across nodes) via the cluster IP, thanks to kube-proxy's distributed routing rules.
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
✓
Via the service's cluster IP and port
A Service of type ClusterIP exposes a stable virtual IP (the cluster IP) and port within the cluster. Pods reach the Service by sending traffic to this cluster IP and port, which is then load-balanced by kube-proxy (using iptables, IPVS, or eBPF rules) to one of the backing pod endpoints. This is the default and most fundamental Service type in Kubernetes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Via the service's cluster IP and port
Why this is correct
Pods connect to the service's cluster IP and port, which kube-proxy forwards to healthy pods.
- ✗
Via the node's IP address and a high port
Why it's wrong here
NodePort services expose on node IP and high port, but ClusterIP is internal only.
- ✗
Via an external load balancer
Why it's wrong here
External load balancers are used with LoadBalancer services, not ClusterIP.
- ✗
Directly via the pod's IP address
Why it's wrong here
Pod IPs are ephemeral and not stable; services abstract away pod IPs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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