CS-216: L1 (Q1)

What is the cloud?

• A collection of high-speed networks

• A collection of smartphones

• A collection of commodity servers

• A collection of personal computers

Answer explanation

The cloud is a collection of commodity servers, not high-speed networks, smartphones, or personal computers. These servers provide various services over the internet.

What is virtualization?

• A technique to run multiple virtual machines inside a single physical machine

• A technique to run multiple physical machines inside a single virtual machine

• A technique to run multiple cloud servers inside a single data center

• A technique to run multiple smartphones inside a single tablet

Answer explanation

Virtualization is a technique to run multiple virtual machines inside a single physical machine, making more efficient use of hardware resources.

What is the connection between virtualization and cloud computing?

• Virtualization is not related to cloud computing

• Virtualization is a building block for cloud computing

• Virtualization and cloud computing are completely separate concepts

• Cloud computing is a building block for virtualization

Answer explanation

Virtualization is a building block for cloud computing, as it allows multiple virtual instances to run on a single physical machine, enabling the scalability and flexibility needed for cloud services.

What is a hypervisor?

• A physical machine that hosts multiple virtual servers

• A piece of software that allows multiple virtual machines to run on a single physical machine

• A lightweight virtualization technique

• A type of cloud storage system

Answer explanation

A hypervisor is a piece of software that allows multiple virtual machines to run on a single physical machine, making it the correct choice.

What is the main challenge in virtualization?

• Providing full control of hardware to each guest operating system

• Preventing guests from accessing hardware resources

• Tricking an operating system into sharing hardware with other guests

• Ensuring each guest operating system has a dedicated physical machine

Answer explanation

The main challenge in virtualization is tricking an operating system into sharing hardware with other guests, as virtualization involves multiple operating systems running on the same physical hardware.

What is hardware assisted virtualization?

• A model where the operating system code is modified for virtualization

• A model where virtual machines run without any hardware support

• A model where virtual machines are migrated between physical machines

• A model where the CPU has a special mode to run virtual machines

Answer explanation

Hardware assisted virtualization involves a CPU mode specifically designed to run virtual machines efficiently.

What is full virtualization?

• A technique to run existing operating systems as guest operating systems without hardware support

• A technique to run virtual machines with hardware support

• A technique to migrate virtual machines between physical machines

• A technique to modify the operating system code for virtualization

Answer explanation

Full virtualization is a technique to run existing operating systems as guest operating systems without hardware support, allowing for the creation of virtual machines.

What is para virtualization?

• A technique to migrate virtual machines between physical machines

• A technique to run existing operating systems as guest operating systems with hardware support

• A technique to run virtual machines without hardware support

• A technique to modify the operating system code for virtualization

Answer explanation

Para virtualization is a technique that involves modifying the operating system code to enable virtualization, allowing for better performance and efficiency in running virtual machines.

What is the role of a type 1 hypervisor?

• Depends on an underlying host operating system for some functionality

• Runs on a host operating system which runs on the hardware

• Leverages hardware support for virtualization

• Directly runs on the hardware without a host operating system

Answer explanation

A type 1 hypervisor directly runs on the hardware without a host operating system, allowing for efficient virtualization without the need for an underlying OS.

What is the main focus of the course regarding virtualization?

• Studying distributed systems concepts

• Understanding cloud storage frameworks

• Designing virtual machine monitors

• Exploring container frameworks

Answer explanation

The main focus of the course regarding virtualization is designing virtual machine monitors.