KCNA Container Orchestration Practice Question
Which TWO of the following are true about container networking basics? (Choose 2)
⚠ Common exam trap
KCNA often tests the misconception that containers always share the host's IP or that networking is automatic, confusing host mode with default bridge mode.
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
✓
Containers on the same host can communicate via a bridge network
Option B is correct because containers on the same host can communicate through a bridge network, such as Docker's default bridge, where veth pairs connect container interfaces to a Linux bridge and IP forwarding enables same-host traffic. Option C is correct because each container is created with its own network namespace, giving it separate interfaces, routing tables, and IP addresses isolated from other containers and the host. Option A is incorrect because containers on different nodes can communicate via overlay networks, routing, or service meshes, not only on the same node. Option D is incorrect because container networking requires configuration such as bridge creation, IP address assignment, port mapping, or CNI plugin setup. Option E is incorrect because containers normally have their own IP addresses within their network namespace, not the host's IP address, unless using host networking mode.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Containers can only communicate if they are on the same node
Why it's wrong here
Containers on different nodes communicate across the cluster network via overlay or routing, so same-node placement is not required. It is tempting because containers on one node do communicate over a local bridge, but that local path is one case, not a restriction on cross-node traffic.
- ✓
Containers on the same host can communicate via a bridge network
Why this is correct
A bridge network on the host connects containers through a virtual switch, letting them reach each other by IP or container name without leaving the host. This satisfies the stem's requirement about same-host container communication.
- ✓
Each container has its own network namespace
Why this is correct
Each container receives a separate network namespace, giving it an isolated set of interfaces, routing tables and firewall rules. This satisfies the stem's requirement for a true statement about container networking basics: isolation at the kernel level, so processes in one container cannot see another's network stack directly.
- ✗
Container networking does not require any configuration
Why it's wrong here
Container networking requires configuration: network namespaces, virtual interfaces, and CNI plugins must be provisioned before containers communicate. It is tempting because tooling such as Docker or Kubernetes automates this setup, but that automation performs configuration rather than eliminating the need for it.
- ✗
All containers share the host's IP address
Why it's wrong here
Each container receives its own network namespace and IP address; only host-network mode containers share the host's address. It is tempting because host-network mode does exist, but that is a deliberate per-container configuration, not the default behaviour of container networking generally.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CNCF exam blueprint
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