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20565465
NETWORKS
Descrição
9/2/20
Sem etiquetas
computer science
computing
year 8
Mapa Mental por
lucy cowell
, atualizado more than 1 year ago
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Menos
Criado por
lucy cowell
mais de 4 anos atrás
35
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Resumo de Recurso
NETWORKS
advantages
share resources
such as printers and internet connections
share logins
the same username and password can be used on every computer on the network
share files
the same files are available whichever computers you use
disadvantages
cost
networks are expensive to set up
extra hardware and wiring needed
increased risk
problems such as viruses can affect every computer on the network
difficulty
expertise is needed to set up and maintain a network
types of network
LAN
Local Area Network
a network contained in a single geographical location or organisation
wan
Wide Area Network
a network that spans a large geographical area, or multiple organisations
often consists of multiple LANs networked together
Topologies
bus topology
Advantage: cheap to install
Disadvantages: high chance of catastrophic failure, lots of collisions, slows down as more computers are added
ring topology
advantages: cheap to install, no collisions(fast)
disadvantages: high chance of catastrophic failure, difficult to expand
star topology
advantages: low chance of failure, no collisions(fast)
disadvantages: expensive, depends on a switch
IP Address
computers on a network need an address to identify them.
when a computer is added to a network it is assigned an IP Address(internet Protocal Addresss)
the IP Address is an unique value assigned to each computer
Each IP Address on a network must be unique
mesh
the interenet
it is impossible to break the internet, since another route can always be found.
there are multiple different routes between any two nodes
a cost is assigned to each connection in a mesh
route-finding algorithms are used to find the lowest cost route between two nodes.
data is split into small chunks called packets
each packet is sent along the lowest cost route
the packets are re-assembled on the other side
Anexos de mídia
Bus+Topology (binary/octet-stream)
Ring+Topology (binary/octet-stream)
Star+Topology (binary/octet-stream)
Mesh+Network (binary/octet-stream)
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