KCNA Container Orchestration Practice Question
Which of the following is a key difference between containers and virtual machines?
⚠ Common exam trap
CNCF often tests the misconception that containers and VMs are fundamentally similar in kernel sharing, leading candidates to choose Option B, which incorrectly claims both share the host kernel.
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; VMs run a separate guest OS
The key difference is that containers virtualize at the operating system level, sharing the host OS kernel via namespaces and cgroups, while each virtual machine runs a full, separate guest OS on top of a hypervisor. This architectural distinction means containers are more lightweight and start faster, but VMs provide stronger isolation because they do not share the host kernel.
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 share the host OS kernel; VMs run a separate guest OS
Why this is correct
Containers are lightweight because they share the kernel.
- ✗
Both containers and VMs share the host kernel
Why it's wrong here
VMs do not share the host kernel.
- ✗
Containers have a full guest OS, VMs share the host kernel
Why it's wrong here
It's the opposite.
- ✗
Containers require a hypervisor, VMs do not
Why it's wrong here
VMs require a hypervisor, not containers.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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