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Classified in Computers

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types of network: depend on the geographical size

1. LAN local are network: one geographical area, is large, all computers belong to the same organization: allows user to log from any part of the organisation, easy share of data, help manage system, user work together
2. WLAN: wireless lan: connect wirelessly, need special security
3. PAN: personal area network: devices are connected to computer, to transfer data or synchronise devices, by bluetooth or USB
4. WAN and MAN: man (metropolitan area network): large area, series of lans connected. Wan (wide area network): cover larger areas, connect many computers and lans together, uses vpn
5: SAN storage area network: stores data, conatins multiple hard disks. Stored is mantianed in a single location: distribute add and backup easier 
6. VPN: virtual private network: uses encryption, encrypted tunnel from computer to local network, ensures security
7. VLAN: virtual lan: connects geographically separated computers
NETWORK CONNECTIONS:
wired connections: depend on distance between computers, bandwidth, cost
Fibre optic cables: transfer data sending light beams, extremely fast and expensive, suffer less signal loss, high speed backbone connections
Cable internet access: broadband internet access in homes. Sues existing cable television network. Uses cable modem convert data. High speed and reduces costs, reduce bandwidth
Dialup: old technology, connects computer, using a standard telephone line. Compuetrs must be connected to modem, slow speed, expensive
Ethernet: cables used in lans, transfer data in high speed over short distance
WIRELESS CONNECTIONS:
WIMAX: wireless tech transfer data over large distance, bandwidth is high reduces with distance, provides internet in homes
WIFI (wireless fidelity) wireless connection in small areas. Wifi devices connect to wireless router and there to internet
Bluetooth: wireless technology short distance or pans
3g and 4g: wireless communications, operate using mobile phone network
MEASURE NETWORK SPEED:
Bandwidth: amount of data that can be transferred at once
COMMUNICATING ON NETWORKS: 
mac adresses: unique number built on a network
Protocol: rules about how to do something, differ in technologies
IP (internet protocol) how devices on a network are identifies
IP adress: uniquely identitifies the computer on the network
TCP: ensures data is sent and recieved correctly
PORTS: service available in computers, computers can offer different services
INTERNET: network of networks
Data routing: enables fast communications not 100% security
DOMAIN NAMES AND DNS: URLS: computers identify each other on networks, generally short to remember, prove enough detail of owner
INTERNET PROTOCOLS: 
hypertext transfer protocol: communication between web servers and web browsers 
Hypertext transfer protocol security: encrypt data to provide communication 
SYNCHRONOUS: sender and receiver synchronise times and agree transfer rate, faster transfer process
ASYNCRHONOUS: sender and receiver are not synchronoised in terms of time
INTERNET: physical network of computers
WEB: one of the service that runs on the internet

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