Topology Presented By : Ravi KumarRoll No : JU-1112-0015
What is Topology ?The topology defines the shape and structureof a Local Area Network (LAN) or othercommunications system.Topologies are either physical or logical
Physical TopologyThe physical layout of devices on a network, or the way that thedevices on a network are arranged and how they communicatewith each other. The way that the workstations are connected to the networkthrough the actual cables that transmit data –the physicalstructure of the network -- is called the physical topology.Logical TopologyThe logical topology, in contrast, is the way that thesignals act on the network media, or the way that thedata passes through the network from one device to thenext without regard to the physical interconnection ofthe devices
Types Of TopologiesDifferent types of topologies are• Single Node Topology• Bus Topology• Star Topology• Ring Topology• Mesh Topology• Tree and Hybrid Topology
Single Node TopologyIn a single node Topology, just a singledevice called a dumb terminal is connectedto the server.
Advantages Of Single Node Topology are: Easy to Install , configure and manage Least expensive , as a ‘Dumb Terminal’ is the cheapest computer Single cable is required Disadvantages Of Single Node Topology are: Only a single device is connected in the entire network Dumb Terminal is dependent on the server for resource
Bus TopologyBus topology connects each device to a singlecable and at either end of the cable terminatoris used to remove unsent data from the cable
Advantages Of Bus Topology are: Easy to connect a device to linear bus Requires less cable Less expansive than other topologies Works better for smaller networks Disadvantages Of Bus Topology are: Entire network gets affected if there is a break in the main cable Terminators are required at both end of the backbone cable Difficult to detect the faulty device Limited number of devices can be attached Heavy traffic and addition of devices degrades the performance Expansive than single node topology
Star TopologyIn star topology , multiple devices are connectedto a central concentration point known as Hub orSwitch.
Advantages Of Star Topology are: Easy to install , configure and manage Easy to detect faulty device Easier to expand Connecting or removing device does not affects the network Hub provides a centralized managementDisadvantages Of Star Topology are:Increased devices causes traffic which makes the network slowRequires more cable length than a linear topologyHub failure leads to network failureMore expensive
Ring TopologyIn a ring topology , data travels aroundthe loop in one direction and passesthrough each device.
Advantages Of Ring Topology are:Easier to manage as compared to bus topologyHandles large volume of trafficVery reliable and offers great speedProvides a good communication over a long distanceNo terminators are required Disadvantages Of Ring Topology are:More cable wires compared to bus topology are requiredOne faulty device affects the entire networkAddition and changes of devices can affects the network
Mesh TopologyIn a mesh topology , every device is connected toeach and every node in the network with manyredundant interconnections and at least twopaths to and from every node.
Advantages Of Mesh Topology are: Provides redundant paths which help in sending data using analternate path if a specific path fails to send the data Entire network does not affected by one faulty device Centralized management is not required as in star topology Easy to detect the faulty deviceDisadvantages Of Mesh Topology are:More cabling is required as compared to bus, star and ring topologiesEach link from one device to another requires an individual NICVery expansive as compared to Bus ,Star and Ring topologiesData carrying capacity is underutilized unless all devicesare transmitting almost constantlyDifficult to configure
Tree TopologyTree topology connects multiple star networksto other star networks using bus topology.
Advantages Of Ring Topology are:Point-to-Point wiring for each deviceEasy to detect a faulty deviceEasy to expand a networkDisadvantages Of Ring Topology are:More difficult to configure as compared to other topologiesFault in the backbone affects the entire networkMore expansive than other topologiesOverall length of each segment is limited by the type of cabling used
Hybrid TopologyHybrid topology is combination ofdifferent topologies such as star-Busor Star-Ring
Advantages Of Hybrid Topology are: Useful for implementing larger networks Handles larger volume of traffic Easy to detect and remove faulty devicesDisadvantages Of Hybrid Topology are: More cabling is required as compared to all other topologies More expensive than all other topologies Complex structure MAU is required Installation and reconfiguration is difficult