Unit 9 - Fundamentals of communication and networking
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Computer Communication and Networking -- Computer Science A-Level
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Unit 9 - Fundamentals of communication and networking
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AQA
This pack of revision notes contains highly-detailed explanations, examples, diagrams and algorithms for Networking and Computer Communication for the Computer Science A-Level.
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Unit 9 - Fundamentals of communication and networking
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Bus Network
#computer-science #computer-communication #networks #bus-network
All nodes are connected to a single backbone cable
Each end of the backbone is connected to either a terminator or a
computer which stops signals “bouncing back”
Each node is passive — they don’t actually send anything
Data is sent in one direction at a time only
Only one computer can transmit successfully at a time
Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
technology is used to enable nodes to transmit on the same cable
Any message sent on the network is received by every other computer
Performance
Since only one computer can communicate on the network at a time, it
is possible that bottlenecks will occur and the performance of the
network will drop.
In a client-server network, the server is usually more powerful, has
more storage and more processing power than the other computers
on the network. The other computers request services from the server.
The server may perform any of the following:
Distribute and maintain software packages
Control the network
Control user access to the network
Control access to the Internet or WAN
Provide file storage
Support a print server
Support an emails erver
Provide processor time to thin clients
,Local Area Networks
#computer-science #computer-communication #networks #local-area-
networks
Local Area Networks
Two or more computers connected together within a small
geographical area, for example: confined to one building or site
One computer, not connected to any other computing device, is called a
“standalone”.
As soon as you connect two or more computers together, they form a
network
Advantages of LANs
Admins have a lot of control over the network
You can set different permissions for individual users
A network topology is the arrangement of the various computing
devices which make up a computer network
Bus Topology: An arrangement where nodes are connected in a
daisy-chain by a single central communication channel
Star Topology: An arrangement where a central node or hub
provides a common connection point for all other nodes
This is a common school configuration
The physical topology of a network defines how the devices are
physically connected
The logical topology defines how the devices communicate across the
physical technologies
A network wired in a star topology can behave logically as a bus
network by using a bus protocol and approximate physical switching
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