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Virtual Machines: Abstraction and Implementation

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Virtual Machines: Abstraction and Implementation

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Questions and Answers

What is the main purpose of a Virtual Machine?

To create the illusion of multiple physical computers (correct)

To enhance the performance of a single computer

To replace the need for physical computers

To reduce the storage requirements of a computer system

In a Virtual Machine, what is the role of 'Virtual user mode'?

Abstracting the hardware of the computer

Protecting the host system from virtual machines

Running different operating systems concurrently (correct)

Isolating one virtual machine from another

How does virtualization protect the host system from virtual machines?

By sharing all resources equally among virtual machines

By isolating each virtual machine from all others (correct)

By merging all virtual machines into the host system

By enhancing the performance of the host system

What potential disadvantage is mentioned regarding isolation in virtual machines?

Prevents sharing of resources Signup and view all the answers

Why is a virus inside a guest operating system unlikely to affect the host system in a Virtual Machine setup?

Due to the complete isolation between virtual machines Signup and view all the answers

How are sharing of resources enabled in Virtual Machines according to the text?

Sharing a file-system volume Signup and view all the answers

What modes must a Virtual Machine have according to the text?

'Virtual user mode' and 'virtual kernel mode' Signup and view all the answers

What is an important advantage of virtualization that ensures protection of resources?

Host system protection from virtual machines Signup and view all the answers

What is the key idea behind a Virtual Machine?

Sharing hardware resources of a single computer for multiple execution environments Signup and view all the answers

Why is the isolation of virtual machines considered advantageous?

It protects the host system and virtual machines from each other Signup and view all the answers

What is a potential drawback of isolation in virtual machines?

Resource sharing becomes difficult Signup and view all the answers

How are Virtual Machine modes related to physical machine modes?

Virtual modes mirror physical machine modes Signup and view all the answers

What does the text suggest as a method to enable resource sharing in Virtual Machines?

Implementing shared file-system volumes Signup and view all the answers

Why is it mentioned that a virus in a guest operating system is unlikely to affect the host system?

Each virtual machine is isolated from others Signup and view all the answers