Network topology means the physical layout of a LAN. It includes geometrical arrangement of computer resources, remote devices and communication facilities. Each device or computer in the network is called a node. Following topologies are most common for local area networking

There are several network topolgies  which are as discussed below –

Star topology – In this topology host computer is the server of the network. This host can be mainframe or a smaller computer.

The printer and the database are the parts of this host computer. It is located in center of the network and all other nodes are connected to it.

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