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Computer Science - unit 5 - Communications Revision

LAN

A Local Area Network is a network confined to one location or organisation.

WAN

A Wide Area Network is a network of LANS spanning wide area.

PAN

Personal Area Network is a very small area network, like a personal hotspot.

MAN

Metropolitan Area Network is a network within a metropolatan district.

VPN

Virtual Private Network is a remote connection to a network through the internet.

Switch

analyses each packet and sends it to the appropriate computer.

Hub

sends each packet to every computer on the network.

Router

Connects LANs together to make WAN.

Gateway

Bridge

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Packet Switching

data is split into PACKETS

each packet takes a different route through the network

data re-assembled at the other side

Circuit Switching

telephones use it

is found, and maintained until the entire transmission is finished

all data traverses the same route

susceptible to interception and failure.

Routing

IP address

DNS