Which virtualization model replaces the operating system on the physical server?

Which virtualization model replaces the operating system on the physical server?

• A. Type II (Hosted)
• B. Type I (Bare Metal)
• C. Container-Based Virtualization
• D. Emulation

Answer: (B)

Bare-metal virtualization is the setup where the virtualization layer runs directly on the hardware, with no general-purpose operating system beneath it. The hypervisor is installed on the server hardware first and then creates and manages multiple virtual machines, each with its own guest operating system. Because there isn’t a separate host OS sitting below the hypervisor, this approach effectively replaces the traditional OS layer on the physical server and typically offers strong isolation and closer-to-native performance. Examples include hypervisors that boot directly on hardware, such as ESXi or Hyper-V Server. In contrast, a hosted hypervisor runs on top of an existing operating system, so the host OS remains and handles the hardware through that layer. Container-based virtualization uses the host OS kernel to isolate applications rather than running separate guest OSes on separate virtual machines. Emulation, meanwhile, imitates different hardware environments to run software, which can involve slower performance and is used for cross-architecture compatibility rather than replacing the host OS with a dedicated virtualization layer.

Bare-metal virtualization is the setup where the virtualization layer runs directly on the hardware, with no general-purpose operating system beneath it. The hypervisor is installed on the server hardware first and then creates and manages multiple virtual machines, each with its own guest operating system. Because there isn’t a separate host OS sitting below the hypervisor, this approach effectively replaces the traditional OS layer on the physical server and typically offers strong isolation and closer-to-native performance. Examples include hypervisors that boot directly on hardware, such as ESXi or Hyper-V Server.

In contrast, a hosted hypervisor runs on top of an existing operating system, so the host OS remains and handles the hardware through that layer. Container-based virtualization uses the host OS kernel to isolate applications rather than running separate guest OSes on separate virtual machines. Emulation, meanwhile, imitates different hardware environments to run software, which can involve slower performance and is used for cross-architecture compatibility rather than replacing the host OS with a dedicated virtualization layer.