Which component is primarily responsible for enabling multiple virtual machines to run on the same physical hardware?

Which component is primarily responsible for enabling multiple virtual machines to run on the same physical hardware?

• A. Hypervisor
• B. Router
• C. Switch
• D. Firewall

Answer: (A)

Virtualization relies on a software layer that sits between the physical hardware and the virtual machines, allocating CPU, memory, and I/O to each VM while keeping them isolated. This layer is the hypervisor, which creates and manages virtualized hardware for every VM and schedules resources so they don’t clash. It can run directly on the hardware (bare-metal) or atop another operating system (hosted). Because of the hypervisor, multiple operating systems can operate simultaneously on the same physical host without interfering with one another. Routers, switches, and firewalls, on the other hand, handle network traffic and security—they don’t provide the resource mediation and isolation that enables multiple VMs to share a single machine.

Virtualization relies on a software layer that sits between the physical hardware and the virtual machines, allocating CPU, memory, and I/O to each VM while keeping them isolated. This layer is the hypervisor, which creates and manages virtualized hardware for every VM and schedules resources so they don’t clash. It can run directly on the hardware (bare-metal) or atop another operating system (hosted). Because of the hypervisor, multiple operating systems can operate simultaneously on the same physical host without interfering with one another. Routers, switches, and firewalls, on the other hand, handle network traffic and security—they don’t provide the resource mediation and isolation that enables multiple VMs to share a single machine.