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ICT - Virt - short

ICT - Virtualisation

TermDefinition
Abstraction from Physical Hardware A principle in virtual networks where physical hardware is separated from the services and functions it provides, allowing for flexible and scalable resource allocation.
Bandwidth Allocation The process of assigning specific amounts of data transmission capacity to different parts of a virtual network to ensure optimal performance.
Benefits of Virtual Networks Advantages include cost efficiency, scalability, improved resource utilisation, easier management, and enhanced disaster recovery capabilities.
Disaster Recovery A benefit of virtual networks where replicated data and virtualised systems can be restored quickly in case of failure, minimising downtime.
Data Encapsulation The technique of packaging data with the necessary protocols for transmission across a virtual network, ensuring security and integrity.
Hybrid Virtual Network A type of virtual network combining on-premises infrastructure with cloud-based resources to provide flexibility and cost savings.
Load Balancing A method used in virtual networks to distribute traffic evenly across multiple servers or resources, ensuring high availability and performance.
Portability The ability to move virtual network components and configurations easily between different environments or infrastructures.
Resource Optimisation The efficient utilisation of hardware and software resources in a virtual network to reduce costs and enhance performance.
Scalability The capability of a virtual network to expand or contract resources as needed, supporting changing workloads or business requirements.
Virtual LAN (VLAN) A type of virtual network that segments physical networks into smaller, logical networks to improve performance and security.
Virtual Machines (VMs) Software-based emulations of physical computers that run on virtual networks, enabling multiple operating systems on a single physical machine.
Wide Area Network (WAN) Virtualisation Using virtual technologies to extend a network over a large geographical area, often incorporating cloud resources and services.
Examples of Virtual network solutions. AWS, Azure, or Google Cloud
Cost Efficiency Reduce the need for physical hardware, lowering costs and simplifying maintenance.
Hypervisor A software OS layer that enables the creation and management of virtual machines and virtual networks on physical hardware.
Host (Host Machine) The physical computer that provides CPU, memory, storage and networking to the virtual environment.
Type 1 Hypervisor (Bare‑metal) Hypervisor installed directly on server hardware, typically used in data centres for server virtualisation
Type 2 Hypervisor (Hosted) Hypervisor that runs as an application on top of a standard desktop OS (for example VMware Workstation, VirtualBox), often used for labs and learning.
Snapshot A point‑in‑time copy of a VM’s state (disk and sometimes memory) that allows roll‑back to that exact state, commonly used before upgrades or experiments
Isolation Property where each VM is kept separate so faults, crashes or compromises in one VM do not directly affect others on the same host.
Thin Client A lightweight computer that depends on a central server for data and applications.
Virtual Switch A software-based switch that facilitates communication between virtual machines.
Elasticity The ability to scale resources up or down based on demand in a virtualised environment.
Docker A platform for developing, shipping, and running containerised applications.
Containers Lightweight virtualisation that packages applications and their dependencies together.
Virtualisation Virtualisation creates a simulated, or virtual, computing environment as opposed to a physical environment. Virtualization often includes computer-generated versions of hardware, operating systems, storage devices, and more.
 



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