1 Introduction to Virtual Machines

Question 1

What is a server?

Answer 1

A server is a computer that offers services to other computers, called clients, which are all connected over a network.
Typically, servers use special processors, memory, and other hardware resources that are more powerful than those of desktop computers

Question 2

What is Virtual Machine?

Answer 2

A virtual machine is a software representation of a physical computer. The operating systems on VMs are called guest operating systems.
VM is a special type of software application that runs a guest OS. It is like a machine running inside another machine.

Question 3

How do you think VMs solve the problem of wasted server resources?

Answer 3

By running multiple VMs on a single server to balance the workloads.

Question 4

How Do Virtual Machines Work?

Answer 4

A VM can be represented as files that are kept in a folder. The folder is like a computer case. The files represent the components of the VM and the devices that are connected to the motherboard. The motherboard is the circuit board that provides connectivity between the hardware components. Hardware component examples include the processor (CPU) and memory (RAM).
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Question 5

Challenge that VM isolation addresses:

Answer 5

Failures.

If a guest OS experiences a failure because it runs beyond its specification limits, other VMs are not affected.

Question 6

Challenge that VM encapsulation addresses:

Answer 6

Portability.
The files that make up a VM are usually stored together in the same folder. Using these files, you can perform the following actions:
- Save the entire state of a VM to files that are encapsulated together.
- Copy the VM files to create multiple replicas of the VM.
- Move a VM from one host to another to perform routine maintenance of the physical server.

Question 7

Challenge that VM hardware independence addresses:

Answer 7

Compatibility.
You can move any VM to any physical server, without having to worry about the compatibility of the VM with the underlying hardware.
Virtualization provides a guest operating system with the virtual hardware that it requires.
If you need to use an OS that requires specific hardware, VM can be provisioned with standardized software-based hardware.

Question 8

Challenge that server consolidation addresses:

Answer 8

Costs.
Using VMs, you can run multiple operating systems on one physical machine.
In this way, you can reduce the number of physical servers and manage your virtual servers more efficiently:
- Reduce power, cooling, and maintenance costs
- Create time to focus on innovation
- Increase the efficient utilization of resources

Question 9

The company decides that creating virtual machines is the answer. Why?

Answer 9

• With virtualization, fewer physical servers are required.

- You can move VMs between physical servers without worrying about hardware compatibility.

Question 10

Which statements accurately describe VMs?

Answer 10

• A VM is like a machine running inside another machine.
• Host machines can run more than one VM at the same time.
• A VM is a software representation of a physical computer and its components.

Question 11

Which component of a VM links a computer’s hardware and software?

Answer 11

Driver