Kubernetes Core Concepts KCNA Practice Questions (Page 11)

Questions 51–55

1. 51application · medium

   A company runs a microservices application where the frontend needs to communicate with a backend service. The backend has 3 replicas, each with its own Pod IP. The frontend uses a Service named 'backend' to reach the backend. The team wants to ensure that the frontend always resolves the Service name to a stable virtual IP, regardless of Pod restarts or scaling. Which Service type should they use?

   • AClusterIP
   • BNodePort
   • CExternalName
   • DLoadBalancer
   Reveal Solution Discussion Select an answer first
2. 52foundation · easy

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

   • ABy using the Pod's IP address
   • BBy using a label selector
   • CBy using the container image name
   • DBy using the node name
   Reveal Solution Discussion Select an answer first
4. 53foundation · easy

   Which statement correctly describes the role of worker nodes in a Kubernetes cluster?

   • AWorker nodes only manage networking and do not run application containers.
   • BWorker nodes are responsible for storing cluster state and serving the Kubernetes API.
   • CWorker nodes host application workloads and run components like kubelet and kube-proxy.
   • DWorker nodes run the control plane components and host application workloads.
   Reveal Solution Discussion Select an answer first
5. 54application · medium

   A team deploys a web application that takes 30 seconds to initialize before it can serve traffic. They notice that during startup, the application is receiving requests and returning errors. They want to prevent traffic from being sent to the Pod until it is fully ready, but they do not want the container to be restarted during initialization. Which probe configuration should they use?

   • AA liveness probe with a 30-second failure threshold
   • BA startup probe with a 30-second initial delay
   • CA readiness probe with a 30-second initial delay
   • DA liveness probe with a 30-second initial delay
   Reveal Solution Discussion Select an answer first
6. 55foundation · easy

   What is the primary responsibility of a ReplicaSet?

   • ATo store configuration data for Pods
   • BTo provide load balancing for Pods
   • CTo manage rolling updates of applications
   • DTo ensure a specified number of Pod replicas are running at all times
   Reveal Solution Discussion Select an answer first