KCNA Container Orchestration Practice Question
Which TWO of the following are benefits of using containers over virtual machines? (Choose 2)
⚠ Common exam trap
A common mix-up: candidates confuse container isolation with VM isolation, assuming containers are more secure, when in fact VMs provide stronger isolation due to hardware virtualization, and CNCF often tests this distinction by offering 'stronger isolation' as a distractor.
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 are more lightweight and start faster than VMs
Containers share the host OS kernel and run as isolated processes, making them lightweight and able to start in milliseconds, unlike VMs which require booting a full guest OS. This efficiency stems from container images being mere megabytes compared to gigabytes for VM images, and containers using cgroups and namespaces for resource management rather than a hypervisor.
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 are more lightweight and start faster than VMs
Why this is correct
Containers share the host OS kernel and do not need to boot an OS, so they start in seconds.
- ✗
Containers require hypervisor software to run
Why it's wrong here
Containers run directly on the host OS using the kernel's container features, no hypervisor required.
- ✗
Containers include a full guest operating system
Why it's wrong here
Containers share the host OS kernel and do not include a full guest OS, unlike VMs.
- ✓
Containers are portable across different environments
Why this is correct
Container images bundle the application and its dependencies, making them run consistently across any system with a compatible container runtime.
- ✗
Containers provide stronger isolation than VMs
Why it's wrong here
VMs provide stronger isolation because each VM has its own kernel. Containers share the host kernel.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA 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 KCNA exam.