ITGSS Certified DevOps Engineer Practice Test

By default, what is the communication allowance between pods in a Kubernetes cluster?

1. Only selected pods can communicate

2. Every pod can contact every other pod

3. Communication is restricted by roles

4. No communication is allowed

The correct answer is: Every pod can contact every other pod

In a Kubernetes cluster, the default communication allowance between pods is that every pod can contact every other pod. This design choice is rooted in the fundamental principles of Kubernetes, which are geared towards ensuring seamless interaction within distributed applications. When a pod is created in Kubernetes, it is assigned an IP address. By default, all pods can communicate with one another without any specific network policies restricting interactions. This means that each pod can send requests and receive responses from any other pod in the same cluster, facilitating microservices architecture and allowing for efficient service discovery. The open communication model simplifies the deployment of applications that may have multiple components requiring interaction. Moreover, this design ensures that developers can more easily build, test, and scale applications without being hampered by network restrictions. When diving deeper into the implications of this default setting, it’s important to realize that while it's convenient, Kubernetes does provide mechanisms like Network Policies that can be implemented later to restrict pod communication when necessary. However, unless specified otherwise, the default behavior allows for comprehensive connectivity among all pods in the cluster.