Containerization KCNA Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the primary difference between a container and a virtual machine?

   • AContainers share the host operating system kernel, while virtual machines include a full guest operating system.
   • BContainers require a hypervisor to run, while virtual machines do not.
   • CVirtual machines share the host kernel, while containers each have their own kernel.
   • DContainers are larger in size than virtual machines because they include the operating system.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A platform engineer is troubleshooting why a containerized application fails to start on a Kubernetes node. The container image is valid and the Kubernetes pod is scheduled, but the container exits immediately. The engineer suspects the container runtime is not correctly executing the container's entrypoint. Which component is directly responsible for running the container process?

   • Akube-apiserver
   • BContainer runtime (e.g., containerd)
   • Ckubelet
   • DContainer registry
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   An operator is running a batch job in a container that processes a large dataset. The job is expected to take several hours. The operator wants to ensure that if the container is accidentally stopped, the job can resume from where it left off rather than starting over. What is the best approach?

   • ACommit the container to a new image every hour.
   • BKeep the container running in the foreground and rely on the operator to restart it manually.
   • CUse a tmpfs mount to store intermediate results for fast access.
   • DUse a named volume to store intermediate results and design the application to checkpoint its progress.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Why are volumes used in container storage?

   • ATo increase the container's CPU performance.
   • BTo provide a read-only filesystem for the container.
   • CTo make the container image smaller.
   • DTo persist data beyond the container's lifecycle.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A developer is running two containers on the same Docker host. Container A needs to communicate with Container B using a service name, but the IP address of Container B may change when it is restarted. What should the developer do to enable reliable communication?

   • AExpose Container B's port on the host and connect via localhost.
   • BHardcode the IP address of Container B in Container A's configuration.
   • CPlace both containers on the same user-defined bridge network and use the container name as the hostname.
   • DUse the host network mode for both containers.
   Reveal Solution Discussion Select an answer first