What is Toypologies
TOPOLOGY
Network topology is the arrangement of various elements as links, nodes etc. It refers to the way in which network of computers is connected. Choice of topology is dependent upon:-
· type and number of devices used
· rate of data transfer
· cost
Types:-
Physical Topology- Physical location of devices and cable installation in a network. It defies how devices are connected in a network through cables. It is a physical structure of a network.
Logical Topology- It shows the flow of data within a network. - It also referred as Signal topology. It is used to describe the arrangement of devices in a network and how they communicate with each other.
Network Topologies:
· Bus- Bus topology is used in LAN where each computer is connected to a single cable i.e. Backbone cable. As there is a use of only one single cable and that can be single point of failure.
· Ring- Ring topology is designed in a circular form in which data travels through ring in one direction. When device sends data, it travels through each device until each reaches its destination.
· Star- In this topology, each computer is connected to a central device that can be switch/hub. Central device is the server and nodes/computers are clients. It is easy to design and implement. Central device can be a single point of failure.
· Tree- It is based on hierarchy of computer systems. The highest level of tree network consist a single rootcomputer and this will further connected to lower level computers.
It can be a combination of Bus and star topology.
· Mesh- In this topology, all computers are directly connected to each other. There is no need to use switching nor broadcasting. This topology is more costly than other topologies as there is a use of more cables. It is not used for connecting computer networks basically used to connect routers.
LAN Transmission Methods:-
· Unicast
· Multicast
· Broadcast
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