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1.4 Wired & Wireless Networks (Why use a network? (Centralised ADMIN -…
1.4 Wired & Wireless Networks
What is a network?
Any computer/device that is not connected to any other computer/device
Computer Network
a collection of computers that are connected together to allow the sharing of resources and information
Why use a network?
Centralised ADMIN - rules, updates, backup
Login from any connected machine
Share peripherals e.g. printers
Distributed processing
Share data/files/info
Monitor users' activity
Communications between users
Local Area Network (LAN)
Computers located close to each other- on same site
has it's own infrastructure
own cables / wireless access points (WAPs)
own routers/switches
Typically found in..
school
small business/shop
home with more than one device
Wide Area (WAN)
Two or more LANs joined together
Computers connected over a large geographical area-town
Some of its infrastructure may be provided by others..
use of satellites, phone lines
Typically found in..
large businesses
connecting government / military buildings
BIGGEST WAN IS THE INTERNET
Network Structures
Different ways of setting up LANs and WANs
Client to Server
server is a dedicated, high performance machine
Clients request services from server
eg Authentication
network relies on a central server(s)
Peer to Peer
all devices can request and provide network services
files are stored on individual machines
each computer can act as a client and a server
back-up must be done on individual machine basis
all computers on the network have equal status
no additional hardware or software is required to set up this type of network
bittorrent file sharing systems are an example of a p-t-p network
Virtual Private Network (VPN)
creates a private network across a public one like the internet
provides encrypted 'tunnel' between machines
software based private network
allows for secure transfer of data