Summary Networks mindmap for AQA computer science GCSE

COMPUTER NETWORKS
BUS TOPOLOGY
files
i
i
BENEFITS
sharing
-


easier
-
is
-




PRO) -

network is unaffected it device fails
share the same hardware


software
STAR TOPOLOGY aren't
dependent on central switch
-install and
update on all

-PRO)
NETWORKS if device fails rest of the network is unaffected
relatively cheap
-

the
-


a ,




ar once
computers
-




LAN -

Local Area Network -simple to add more devices -


CONS -
data collisions are more common AUTHENTICATION
and
communicate
cheaply easily from
geographical
~ area
-small network slow unauthorised data
is
prevents people accessing
-




-better performance
showed
centrally
*
-user accounts
·


can be wired or wireless
few dara collisions -if the main cable breaks -PASSWORDS
the
DRAWBACK) to set
very
expensive up
-
-




schools businesses universities faill BIOMETRIC
eg. body
-

in
-




system unique part
-CONS to cables scans of their
-



, ,
-


expensive due
to
vunerable hacking
·




Area EMAIL CONFORMATION
-




-WAN-Wide Network switch is expensive
~




server
dependent on a
-




↳
CAPTCHA from
connects LANS different
geographical prevents programs automatically
-



whole affected it switch fails
-


in network
~


is
-



difficult to
manage
locations maximum number of connections is determined
by the switch doing something
to
more
expensive ser
-




up
The internet
eg.
-




-


PAN -
Personal Area Network


devices short
range
in
4 connects a




-centered around one user



Bluetooth
eg.
·




WIRED

-

HARDWARE

↳
-
Network Interface Card (NIC) -
allows it to connect to devices -


Ethernet -




pairs of copper wires


↳
twisted to reduce internal interference
-Switches -

connect devices on a LAN




Net works
bandwidth
networks cheaper decent
-



Routers -
transmit data between different ,




transmit
Fiberoptic data light copper with
-




Single
as Coaxil wire
-




plastic covering
-




high performance ,
expensive
and metal mesh


suffer interference
don't ↳
shields from outside interference


distances high bandwidth
large ,


very cheap ,
low bandwidth




WIRELESS

family of WLAN
protocols
-




-

uses radio waves




requires a wireless access
point (WAP)

around Less secure
-




BENEFIT) connect DRAWBACK)
automatically
-

move
-


,




limit far
signal
on how a
better for environment
-cheaper ,




can reach
to add users
easy more
PROTOCOL

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