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Virtualisation and Network Characteristics (Virtualisation to create a…
Virtualisation and Network Characteristics
Virtualisation
to create a simulated or virtual network, computer or server using software
Client Virtualisation
Run different operating systems on one client
:check: Accessing your desktop from anywhere
:red_cross: Limit of the number of OS
Storage Virtualisation
Merging of physical storage from multiple network storage devices into what appears to be a single storage device
:red_cross: Can make upgrade challenging process
:check: Can be managed from a central console
:check: Improved storage management
Server Virtualisation
Masking of server resources; including the number and identity of individual physical servers, processors and operating systems from server users
:check: When servers are virtualized, many IT operations can be automated which allows you to reduce the number of technicians you have on staff
:red_cross: You may still need to maintain a hybrid system to ensure all of your applications keep working as they should
Similar to virtualisation but...
When you save things in ‘the cloud’ they are being stored somewhere external, and it makes them easily accessible from anywhere in the world
Network Characteristics
Network Structure
Client
Files are stored on a dedicated server
Server will be accessed at all times to retrieve and save files
:check: All files stored centrally
:check: Back ups can be initiated by ICT specialists
:check: Files will be available even if some client PCs fail
:red_cross: Requires a network OS
:red_cross: Servers are expensive
:red_cross: Specialist staff required to maintain the network
Peer-to-Peer
Computers are linked to each other
They send data packets between / through each other instead of a dedicated server
:check: Don’t need network OS as there is no server
:check: Don’t need ICT specialist because each user sets access rights
:check: One PC failing will not bring down the entire network
:red_cross: Performance will decrease with more people logged in
:red_cross: Cannot perform a central backup of files
:red_cross: Files may be difficult to locate due to each individual folder structure
Network Topologies
Ring
A network topology in which each node connects to exactly two other nodes, forming a single continuous pathway for signals through each node - a ring
:check: Does not require a central node to manage the connectivity between the computers
:check: Point to point line configuration makes it easy to identify and isolate faults
:red_cross: One malfunctioning workstation can create problems for the entire network
:red_cross: Moving, adding and changing the devices can affect the network
:red_cross:Communication delay is directly proportional to the number of nodes in the network
Mesh
A type of network topology in which a device (node) transmits its own data as well as serves as a relay for other nodes
:red_cross: Building and maintaining the topology is difficult and time consuming
:red_cross: The chance of redundant connections is high, which adds to the high costs and potential for reduced efficiency
:check: Manages high amounts of traffic, because multiple devices can transmit data simultaneously
:check: A failure of one device does not cause a break in the network or transmission of data
Bus
An arrangement in a local area network (LAN) in which each node (workstation or other device) is connected to a main cable or link called the bus
:check: Very easy to connect a computer or peripheral to a linear bus
:check: Requires less cable length than a star topology resulting in lower costs
:check: If one node fails, it will not affect the whole network
:red_cross: The entire network shuts down if there is a break in the main cable or one of the T connectors break
:red_cross: Large amount of packet collisions on the network, which results in high amounts of packet loss
Star
A local area network (LAN) in which all nodes (workstations or other devices) are directly connected to a common central computer
:red_cross: Expensive due to the number and length of cables needed to wire each host to the central hub
:red_cross: The central hub is a single point of failure for the network
:check: If one node or its connection breaks, it does not affect the other computers nor their connections
:check: Devices can be added or removed without disturbing the network
:check: Works well under heavy load
:check: Appropriate for a large network