This section contain notes on following topics
1 |
Network fundamentals
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2 |
Transmission Media Reference Models
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3 |
Data Communication
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4 |
Internetworking
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5 |
Routing
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6 |
Network Security
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Computer Network
A computer network is a group of two or more computers connected to each other through some coneecting medium. This means that the computers can communicate with each other. All computers in a network can send and recieve information.
Topologies in Computer Network -
Topology is the arrangement of computers ins network mean how they are connected to each other. They are categorized into the following types:
Bus Topology
This type of network uses a common device to connect all computers. A single cable works as backbone and acts as a shared communication medium on to which devices attach with an interface connector.
Ring Topology
It is in the form of ring where each node is connected exactly with two neighboring nodes . In this type of topology communication takes place onliy in one direction . Failure of a single node results in the failure of complete network .
Star Topology
In this topology a central connecting device called hub, switch or router is used as a medium to connect different nodes of network. In this topology whole of the communication is dependent on central hub. Failure of this central hub results in the failure of complete network.
Tree Topology
This type of topology is in the form of tree , in this various star topologies are coneected together using a bus.In this topology if the bus stops functioning , still part of network can function.