KCNA Container Orchestration Practice Question
A microservices application has multiple services that need to discover each other by name. Which Kubernetes object provides built-in service discovery via DNS?
⚠ Common exam trap
Many exam-takers confuse Ingress (external routing) with internal DNS-based service discovery, or assume that Namespaces themselves provide DNS resolution, when in fact it is the Service object that triggers DNS record creation.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Service
A Kubernetes Service object provides built-in service discovery via DNS. When a Service is created, the cluster's DNS (typically CoreDNS) automatically assigns it a DNS name in the format `<service>.<namespace>.svc.cluster.local`, allowing other microservices to resolve the Service by name without hardcoding IP addresses or using external service registries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ingress
Why it's wrong here
Ingress provides external HTTP routing, not internal service discovery.
- ✗
Namespace
Why it's wrong here
Namespaces provide scope, not DNS-based discovery.
- ✗
ConfigMap
Why it's wrong here
ConfigMap stores configuration, not service discovery.
- ✓
Service
Why this is correct
Services are assigned DNS names (e.g., my-svc.namespace.svc.cluster.local).
Visual reference
Go deeper
Related to this question
Learn chapter
Kubernetes Overview and Core Components
Key term
Kubernetes API Primitives
Kubernetes API Primitives are the basic building blocks that the Kubernetes API uses to represent and manage the state of a cluster, such as Pods, Services, Deployments, and Namespaces.
Key term
ReplicaSet and Replication
A ReplicaSet ensures a specified number of identical pod instances are running at all times in Kubernetes, using replication to maintain availability and stability.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the KCNA exam.