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Questions and Answers
What is the primary role of a hypervisor in virtualization?
What is the primary role of a hypervisor in virtualization?
Which statement best describes a Type 1 hypervisor?
Which statement best describes a Type 1 hypervisor?
What characterizes a Type 2 hypervisor?
What characterizes a Type 2 hypervisor?
Which of the following is NOT a benefit of virtualization?
Which of the following is NOT a benefit of virtualization?
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Which of the following best defines the term 'bare metal' in virtualization?
Which of the following best defines the term 'bare metal' in virtualization?
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What is a primary reason for utilizing virtualization in data centers?
What is a primary reason for utilizing virtualization in data centers?
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Which feature of virtualization allows for quick recovery after a system instability?
Which feature of virtualization allows for quick recovery after a system instability?
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Which component can be virtualized to improve processor performance in virtualization tasks?
Which component can be virtualized to improve processor performance in virtualization tasks?
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What is one way virtualization addresses rising energy costs in data centers?
What is one way virtualization addresses rising energy costs in data centers?
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Why is it important to check licensing agreements before using software in a virtual environment?
Why is it important to check licensing agreements before using software in a virtual environment?
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Which of the following best describes how virtualization impacts system administration costs?
Which of the following best describes how virtualization impacts system administration costs?
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What is a potential challenge when transitioning to new hardware for virtualization?
What is a potential challenge when transitioning to new hardware for virtualization?
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Study Notes
Virtualization
- Virtualization is a technique that allows multiple guest operating systems (OS) to share a single piece of hardware, such as a server.
- The underlying virtualization software layer is called the host system.
- A guest operating system is an OS hosted by the host system.
Hypervisor
- A hypervisor is software or firmware that enables the segmentation and monitoring of physical hardware.
- Two types of hypervisors exist: Type 1 and Type 2.
Type 1 Hypervisor
- Runs directly on the system's hardware.
- No intermediary operating system is required.
- Examples include ESXi, Proxmox, and Hyper-V.
- "Bare metal" environment means the virtual machine is installed directly on the hardware rather than within the host operating system (OS).
- "Bare metal" usually refers to the hard drive, where the OS is normally installed.
Type 2 Hypervisor
- Runs as an application within an operating system environment.
- Examples: VMware Workstation, Oracle's VirtualBox.
- The host hardware is the base for the host OS, which supports the virtualization application.
- The virtualization application, in turn, hosts guest OS(s).
Reasons to Use Virtualization
- Hardware underutilization
- Data centers running out of space
- Increasing energy costs
- Rising system administration costs.
- Setting up complex testing environments, including networking
- Faster access to other operating systems
- Virtual machine running alongside the host operating system, without shutting down the host.
- Access to other operating systems quickly.
- Snapshots and undo disks for software updates on a VM
- Virtualized hardware allows easier driver access for older operating systems using modern hardware
- VM's often have more widely supported virtual hardware than older hardware that is independent of a host operating system.
Benefits of Virtualization
- Shorter development cycles
- Increased hardware utilization
- Reduced problem-resolution time
- Increased productivity
- Accelerate time-to-market
- Improved project quality
- Relocation of systems from one machine to another, if needed
- Disaster protection in case of hardware failure
What Can Be Virtualized
- Network: Dividing network bandwidth into separate independent channels, and virtualizing routers (including NAT and DHCP functionality).
- Storage: Separating virtual machine storage areas, pooling physical storage from various network storage devices (like SAN - Storage Area Networks) into a singular device.
- CPU: Using similar, but independent technologies by Intel (VT-x) and AMD (AMD-V), to improve processor performance by translating instructions and memory addresses, common challenges for virtualization.
Licensing
- Licensing for software is important for all scenarios, and especially important when using software in a virtualized environment, including Operating Systems (OS).
- Licenses for Windows virtual machines need licensing for both their use as guest operating system and as the host.
- Apple operating systems may require that the virtual hardware for the Mac OS is Apple-compatible to run in a virtual environment.
- Open-source licensing may differ for each Linux distribution. Always check before proceeding.
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Description
This quiz covers the fundamentals of virtualization, including the concepts of host systems and guest operating systems. It delves into the two types of hypervisors: Type 1 and Type 2, highlighting their differences and providing examples of each type. Test your knowledge on these essential components of virtual technology.
