Certified Kubernetes Application Developer (CKAD) Practice Test

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Enhance your skills for the CKAD exam. Study with curated quizzes and detailed explanations. Prepare effectively for your success!

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An associated headless service with a pod allows for what kind of DNS behavior?

Service-level DNS resolution only
Pod-level DNS resolution only
Both pod and service-level DNS resolution
No DNS resolution

The correct answer is: Both pod and service-level DNS resolution

An associated headless service with a pod enables both pod and service-level DNS resolution features. When you create a headless service in Kubernetes, you set its cluster IP to "None." This configuration allows DNS queries to directly resolve to the individual pods backing the service rather than to a single service IP. As a result, each pod will have its DNS record that clients can resolve. This means that when you query for the service's DNS name, you receive the individual pod IP addresses associated with that service instead of just one stable IP address. This functionality is particularly useful for applications that require direct interaction with specific pods, such as when performing stateful operations or when using certain databases. Additionally, this dual behavior promotes better load balancing and service discovery in terms of pod-level communication as well. In summary, a headless service facilitates both pod-level DNS resolution, where individual pod IPs are returned, and service-level resolution, as it still plays a role in the broader service communication strategy within the Kubernetes ecosystem.