Question at position 3 What is the function of a hypervisor in a virtualised environment?It allows the creation and management of virtual machinesIt serves as physical backup storageIt updates the host operating systemIt powers down virtual machinesClear my selection

Question

Question at position 3 What is the function of a hypervisor in a virtualised environment?It allows the creation and management of virtual machinesIt serves as physical backup storageIt updates the host operating systemIt powers down virtual machinesClear my selection

BlackTom AI · Accepted Answer

A hypervisor is the software layer that creates, runs and manages virtual machines by abstracting physical hardware into multiple independent virtual systems.

1. Relevant knowledge points and concepts
- Hypervisor (virtual machine monitor): software that enables virtualization by presenting virtual hardware to guest operating systems.
- Two main types: Type 1 (bare-metal) runs directly on host hardware; Type 2 runs on top of a host OS.
- Core responsibilities: VM creation, allocation and scheduling of CPU/memory/storage/network resources, isolation between VMs, and lifecycle operations (start, pause, stop, migrate, snapshot).

2. Step-by-step reasoning process
- Read each option and compare to the core responsibilities of a hypervisor.
- Option A: “It allows the creation and management of virtual machines.” Matches core responsibilities: hypervisors instantiate VMs, allocate resources, control execution, and manage VM state.
- Option B: “It serves as physical backup storage.” Hypervisors use physical storage but are not primarily backup systems; backup is a separate function often provided by storage or backup software.
- Option C: “It updates the host operating system.” Updating the host OS is a system administration task; hypervisors do not perform OS updates (Type 1 hypervisors may replace the host OS role).
- Option D: “It powers down virtual machines.” Powering down is a single action hypervisors can perform, but it is only a small part of overall management, not the main function.

3. Intermediate reasoning steps (no numeric calculations)
- Identify primary duties: creation, resource allocation, isolation, lifecycle management.
- Match options to duties: only Option A encapsulates the full role.

4. Why the correct answer is correct
- Option A explicitly states the creation and management of VMs, which is the defining purpose of a hypervisor. All other functions (powering down) are sub-actions; backup and OS updates are outside its primary role.

5. Why other options are incorrect (brief)
- B: Backup storage is a separate infrastructure/service, not the hypervisor’s purpose.
- C: OS updates are administrative tasks and not a hypervisor responsibility.
- D: Powering down is one control action but not the overall function.

6. Conclusion
The correct answer is: It allows the creation and management of virtual machines — this matches the provided answer.

Question at position 3 What is the function of a hypervisor in a virtualised environment?It allows the creation and management of virtual machinesIt serves as physical backup storageIt updates the host operating systemIt powers down virtual machinesClear my selection单项选择题

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