A developer is debugging a connection issue from a pod in the 'default' namespace to a Service named 'database' in the 'data' namespace. The developer is using the short name 'database' in their connection string, but the connection fails. What is the most likely cause?

The Service 'database' has a typo in its selector, so it has no endpoints.

The Service 'database' is not exposed on a ClusterIP.

The Service 'database' does not exist in the 'default' namespace.

The pod's DNS resolver is not configured to use CoreDNS.

How do pods on different nodes communicate with each other in a Kubernetes cluster?

By sending traffic through a Service that proxies to the destination pod

Through a VPN tunnel established between the nodes

Through a central API server that routes traffic between pods

Using the pod's IP address directly, routed by the cluster's network

What is the primary role of an Ingress in Kubernetes?

To encrypt traffic between pods

To provide a stable IP address for a Service

To expose HTTP and HTTPS routes from outside the cluster to Services

To load-balance TCP traffic between pods

What is the default behavior for pod-to-pod traffic if no NetworkPolicy is applied?

Traffic is allowed only if the pods are on the same node

Traffic is allowed only within the same namespace

Kubernetes and Cloud Native Associate (KCNA)

Domain 1Objective 3

Networking KCNA Practice Questions (Page 3)

Part of the Kubernetes Fundamentals domain, which accounts for 44% of the KCNA exam. Linux Foundation does not publish an official question count, but from its 90-minute exam (~35–60 total, ~15–26 in this domain), expect 3–4 from this objective — we provide 28 practice questions to prepare you well beyond it. (estimate)

28questions here

6free pages

7concepts

44%of the exam

Questions 11–15

11application · medium
A developer is debugging a connection issue from a pod in the 'default' namespace to a Service named 'database' in the 'data' namespace. The developer is using the short name 'database' in their connection string, but the connection fails. What is the most likely cause?
Select an answer first
12foundation · easy
How do pods on different nodes communicate with each other in a Kubernetes cluster?
Select an answer first
13foundation · easy
What is the primary role of an Ingress in Kubernetes?
Select an answer first
14application · medium
A cluster administrator is evaluating CNI plugins for a new cluster. They have a requirement that the CNI plugin must support NetworkPolicies. Which of the following CNI plugins meets this requirement?
Select an answer first
15foundation · easy
What is the default behavior for pod-to-pod traffic if no NetworkPolicy is applied?
Select an answer first

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