CKAD Services and Networking

Question 1

Which Service type exposes an application externally using a cloud provider's load balancer?

Accepted Answer

LoadBalancer

Answer

LoadBalancer type provisions an external load balancer from the cloud provider, assigning a public IP that routes traffic to the service.

Question 2

What is the default Service type in Kubernetes?

Accepted Answer

ClusterIP

Answer

ClusterIP is the default Service type, creating a virtual IP accessible only within the cluster.

Question 3

How does a Service select which pods to route traffic to?

Accepted Answer

By label selectors matching pod labels

Answer

A Service uses 'selector' field with label key-value pairs to dynamically select all matching pods as its endpoints.

Question 4

Which Service type exposes a pod on each node's IP at a static port?

Accepted Answer

NodePort

Answer

NodePort allocates a static port (30000-32767) on every node and routes external traffic to the service's ClusterIP.

Question 5

What does a Network Policy 'policyTypes: [Ingress]' with no 'ingress' rules do to the selected pods?

Accepted Answer

Blocks all ingress traffic to the selected pods

Answer

When policyTypes includes Ingress but no ingress rules are defined, all ingress traffic to the selected pods is denied.

CKAD - Certified Kubernetes Application Developer Practice Test