CKA Services and Networking Practice Question
Which TWO network plugins (CNI) are commonly used in Kubernetes clusters? (Select TWO)
⚠ Common exam trap
Many candidates confuse Kubernetes networking components (CoreDNS, kube-proxy) with actual CNI plugins, or mistaking Docker's deprecated networking model for a valid CNI plugin.
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
✓
Calico
Calico is a widely adopted CNI plugin that provides network policy enforcement using IP-in-IP or VXLAN encapsulation and leverages BGP for routing. It supports both overlay and non-overlay networking, making it suitable for on-premises and cloud deployments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Calico
Why this is correct
Calico is a widely used CNI plugin that provides networking and network policy.
- ✓
Flannel
Why this is correct
Flannel is a simple overlay network CNI plugin.
- ✗
CoreDNS
Why it's wrong here
CoreDNS is a DNS server, not a CNI plugin.
- ✗
kube-proxy
Why it's wrong here
kube-proxy is a component for service networking, not a CNI plugin.
- ✗
Docker
Why it's wrong here
Docker is a container runtime, not a CNI plugin.
Go deeper
Related to this question
Learn chapter
Kubernetes Architecture Overview
Key term
Network Policies
A Kubernetes resource that controls how pods communicate with each other and with other network endpoints, acting as a firewall for pod-to-pod traffic.
Key term
Ingress Resources
Ingress Resources are Kubernetes API objects that manage external access to services inside a cluster, typically HTTP and HTTPS traffic, by defining rules for routing requests based on hostnames and paths.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CKA 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 CKA exam.