Certified Kubernetes Application Developer (CKAD) Practice Test 2025 - Free CKAD Practice Questions and Comprehensive Study Guide

When no type is specified for a service in Kubernetes, the default type is ClusterIP. This behavior ensures that a service is accessible only within the cluster, providing internal communication between different pods without exposing them to external networks. The ClusterIP service type assigns a unique IP address to the service, allowing other services or pods within the same namespace (or other namespaces, depending on the configuration) to access it via this virtual IP.

Choosing ClusterIP as the default promotes security and encapsulation within the cluster, as it prevents unintended exposure to outside traffic. If application developers need to expose their services externally, they can change the type to NodePort or LoadBalancer explicitly based on their requirements. Ingress, while it is a way to manage external access to services, is not a type of service itself but rather a Kubernetes resource that allows for routing external traffic to services based on rules. Therefore, understanding the default behavior of service types is crucial for effective Kubernetes application development.