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unit 5:communication
Descripción
mind map of overall unit 5 communication mainly advantages and disadvantages
Sin etiquetas
unit 5:communication
computing
unit 5: communication
gcse
Mapa Mental por
Paige Cosstick
, actualizado hace más de 1 año
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Paige Cosstick
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Resumen del Recurso
unit 5:communication
networks
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 a wide area-for example the internet .
a network is a group of computers connected together so they can communicate
advantages
share files
share resources (printer)
provide a simple username password
disadvantages
expensive(extra part needed)
lots of reasources
security-can access all computers from one persons error
Topology
Bus Topology
advantages
cheap
easy to install
no extra equipment required
disadvantages
high chance of collision
more computers mean more collisions
damage to the wire results in catasrofic failure
ring topology
advantages
no collisions
number of computers don't effect the speed
disadvantages
one faulty cable or faulty computer will result in a atrophic failure
more difficulty to add new computers
star topology
advantages
no collisions
failure of a cable or computer is not catastrophic
easy to add new computers
disadvantages
expensive (requires hub/swithc and lots of cabling)
failure of hub/switch is catrastrophic and difficult/ expensive to fix
mesh topology
advantages
almost impossible to break
disadvantages
very complex as route finding is necessary to decide path for data
many redundant connection that are rarely used
path finding
circuit switching
advantages
data arrives in the order it was sent
constant speed
can start reading transmission as soon s first bit arrives as data arrives sequentially
disadvantages
only one transmission
packet switching
advantages
multiple transmissions can happen simultaneously
large transmissions don't clog the network
disadvantages
a bit of lag
is needed to allow several packets to arrive before reading as the first packet sent may not be the first packet received
routing
a cost is assigned to each connection in a mesh
route finding algorithms are used to find the lowest cost route between two nodes
network hardware
switch
a switch routes packets round a network by analysing them and sending them to the device they are addressed to.
hub
a hub routes packets round a network by blindly sending them to every device its connected to.
bridge
bridge connects together two networks that use the same base protocals
gateway
a gateway connects together two networks that use different base protocals
router
a router stores the addresses of computers on its network and treansfers their data to devices on other networks
WAP
a WAP is a device that creates a wireless network and allows other devices to connect
NIC
a NIC is a device that joins the network(wired or not) and connects to a computer or other devices
Recursos multimedia adjuntos
Screenshot+2021 09 16+At+07.18.39 (binary/octet-stream)
Screenshot+2021 09 16+At+07.35.52 (binary/octet-stream)
Screenshot+2021 09 16+At+07.41.36 (binary/octet-stream)
Screenshot+2021 09 16+At+07.50.11 (binary/octet-stream)
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