KCNA Container Orchestration Practice Question
Which of the following is a key benefit of using containers over virtual machines?
⚠ Common exam trap
It's easy for candidates to confuse the lightweight nature of containers with stronger isolation, but the key trade-off is that containers share the host kernel, making them less isolated than VMs, not more.
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 share the host OS kernel
Containers share the host operating system kernel, which makes them lightweight and fast to start compared to virtual machines. Each container runs as an isolated user-space process on the same kernel, avoiding the overhead of a separate guest OS per instance. This shared-kernel architecture is a fundamental design principle of containerization technologies like Docker and containerd.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Each container runs its own operating system
Why it's wrong here
This is a characteristic of VMs, not containers.
- ✗
Containers provide stronger isolation than VMs
Why it's wrong here
VMs typically provide stronger isolation due to separate kernels.
- ✗
Containers require hypervisor to run
Why it's wrong here
Containers do not require a hypervisor; they run directly on the host OS.
- ✓
Containers share the host OS kernel
Why this is correct
Containers share the host OS kernel, making them lightweight.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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