Computer Concepts Module 3 Practice Exam

Which statement best describes OS-level virtualization?

Requires separate guest kernels. Uses a hypervisor to run separate VMs. Relies on emulating hardware in software. Uses a shared kernel with isolated user spaces (containers).

Correct Answer:

Uses a shared kernel with isolated user spaces (containers).

Explanation:

OS-level virtualization centers on running multiple isolated environments on a single host OS by sharing the same kernel. Containers fit this model because each container uses the host's kernel but has its own isolated user space, with separate namespaces and root filesystem. This makes them lightweight and fast to start while providing process, filesystem, and network isolation. The other descriptions describe different approaches: requiring separate guest kernels refers to full virtual machines that each need their own kernel; using a hypervisor to run separate VMs is the classic hardware virtualization model; and emulating hardware in software describes software-based hardware emulation, not sharing a kernel across isolated user spaces.

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