What is the role of a CNI (Container Network Interface) plugin in Kubernetes?

To provide storage volumes for pods

To configure pod networking, such as assigning IP addresses and setting up routes

To authenticate users accessing the cluster

To manage the lifecycle of containers

A developer is running a containerized application locally with Docker and wants to understand how the container's network is set up. They notice that the container has its own IP address and can access the internet. What is the default network mode for a Docker container?

Host mode, where the container shares the host's network namespace.

Overlay mode, where the container is connected to a multi-host network.

Bridge mode, where the container is connected to a virtual bridge network.

None mode, where the container has no network connectivity.

When two containers are on the same host and share the same network namespace, how do they typically communicate?

By sending traffic through a load balancer

Through the host's physical network interface

Using the loopback interface (localhost)

Through a virtual private network (VPN) tunnel

How do pods resolve the IP address of a Service in the same namespace?

By reading the Service's IP from environment variables only

By querying the Kubernetes API server directly

By using the Service's short name, which is resolved by the cluster's DNS service

By broadcasting a request to all pods in the namespace

In Kubernetes, what is the default approach for assigning IP addresses to pods?

Pods get IP addresses from the host's DHCP server

Each pod gets a unique IP address from the cluster's pod network

Pods are assigned IP addresses only when they are exposed via a Service

Each node gets a single IP address shared by all pods on that node

Kubernetes and Cloud Native Associate (KCNA)

Domain 1Objective 3

Networking KCNA Practice Questions (Page 2)

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 6–10

6foundation · easy
What is the role of a CNI (Container Network Interface) plugin in Kubernetes?
Select an answer first
7application · medium
A developer is running a containerized application locally with Docker and wants to understand how the container's network is set up. They notice that the container has its own IP address and can access the internet. What is the default network mode for a Docker container?
Select an answer first
8foundation · easy
When two containers are on the same host and share the same network namespace, how do they typically communicate?
Select an answer first
9foundation · easy
How do pods resolve the IP address of a Service in the same namespace?
Select an answer first
10foundation · easy
In Kubernetes, what is the default approach for assigning IP addresses to pods?
Select an answer first

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