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Revision - computer networks (Star topology (expensive (uses the most…
Revision - computer networks
more than one computer connected together
data can pass between them
biggest network is the internet
ring network
easy to set up
hard to modify
quite expensive
requires more cabelling
if one computer crashes, they all crash
Bus network
cheap to install
doesn't require much cabelling
easy to connect new computers
if the main cable breaks the whole network goes down
if one computer crashes, the rest don't
Star topology
expensive
uses the most cable
very easy to connect new computers
all package must go through the central hub before then being sent on towards their final destination
if the central hub breaks, the whole network goes down
if any other computer breaks, the network still works
Mesh topology
if one computer breaks, the network still works
easy to add another device
every computer is connected to every other computer
Key threats to data security
lost
accidently deleted
hacked
data packets
when sending data it is broken up into separate different bits called 'packets'
each packet includes an instructions saying where to send the packet and how to reassemble them when they arrive at their destination
routers direct packets to where they need to go
Bandwidth
the amount of data that can fit through an internet connection
the bigger the bandwidth the more that can pass through it making connection quicker