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Wired and Wireless Networks (VPNs (Creates private network across a…
Wired and Wireless Networks
LANs & WANs
Key Words
Computer Network
A collection of computers that are connected together to allow the sharing resources and information.
Why use a network?
Communications between users
Share data / files / information
Share peripherals e.g. printers
Centralised admin (rules, updates, backup)
Login from any connected machine
Distributed processing
Monitor users' activity
Stand Alone
Any computer/device that is not connected to any other computer/device.
Local Area Network (LAN)
Has its own infrastructure...
own cables / wireless access points (WAPs)
own routers / switches
Typically found in...
A home with more than one device
a school
a small business / shop
Computers located close to each other (in a single building or on the same site)
Wide Area Network (WAN)
Computers connected over a large geographical area (across a town, either end of the country, etc).
Two or more separate LANs joined together.
Some of it's infrastructure may be provided by others...
Use of satellites, phone lines external route.
Typically found in...
Large businesses / organisations with more than one office.
connecting government / military buildings.
The biggest WAN is the internet.
VPNs
Creates private network across a public one like the internet.
Provides encrypted 'tunnel' between machines.
Software based private network.
Allows for secure transfer of data.
Network Set-ups
There are different ways of setting up LANs and WANs depending on how you plan to use them...
Peer-to-Peer Network
All computers on the network have equal status.
Each computer can act as a client
and
a server.
All devices can
request
and
provide
network services.
Files are stored on the individual machines.
Back-up must be done on an individual machine basis.
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.
Client-Server Network
Clients
request services from the server (e.g. authentication, a rule, a file, printing, mail, etc).
The server is a dedicated, high performance machine (users do not login to it).
The network relies on a central
server(s)
.