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XK0-006 Practice Question: Which TWO characteristics apply to Docker…
Which TWO characteristics apply to Docker containers compared to virtual machines? (Choose two.)
⚠ Common exam trap
CompTIA often tests the misconception that containers provide stronger isolation than VMs, but the correct understanding is that VMs offer hardware-level isolation via a hypervisor, while containers share the host kernel and thus have weaker isolation boundaries.
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 kernel
Docker containers share the host kernel, unlike virtual machines which each run their own kernel. This is because containers are implemented as isolated user-space instances (using namespaces and cgroups) that all run on top of the same host OS kernel. This shared kernel architecture eliminates the need for a separate guest OS per container, making containers lightweight and fast to start.
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 kernel
Why this is correct
Containers share the host kernel, making them more efficient.
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Containers have faster startup times
Why this is correct
Containers start in seconds compared to minutes for VMs.
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Containers provide stronger isolation
Why it's wrong here
VMs provide stronger isolation with separate kernels.
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Containers include a full guest operating system
Why it's wrong here
Containers share the host kernel and do not include a full OS.
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Containers require a hypervisor
Why it's wrong here
Containers run directly on the host OS, no hypervisor needed.
Go deeper
Related to this question
Learn chapter
User and Group Administration
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
Key term
Kernel
The kernel is the core program of an operating system that manages hardware resources and provides essential services for all other software to run.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.