CLASS- S.E.(G)Data CommunicationFriday11.25 to 12.25
DEFINITION What is a Topology ? The physical topology of a networkrefers to the configuration of cables, computers and other peripherals.
TYPES OF NETWORK TOPOLOGYThree commonly used network topologiesare:- Bus network. Ring network. Star network.
BUS TOPOLOGYAll computers and devicesconnected to central cable or bus.Consists of a main run of cablewith a terminator at each end.Popular on LANs because theyare inexpensive and easy toinstall.
RING TOPOLOGYCable forms closed ring or loop,with all computers and devicesarranged along ring.Data travels from device todevice around entire ring, inone direction.Primarily is used for LANs,but also is used in WANs.
STAR TOPOLOGYAll devices connect to acentral device, calledhub.All data transferredfrom one computer toanother passes throughhub.
MESH TOPOLOGY• In the mesh topology each computer are connected with each other by separate cable. Create point to point connection to every device on network. If one cable fail data always has alternative path to get to its destination.• On a large scale, you can connect multiple LANs using mesh topology with leased line.• This type topology generally use in military area.
DIFFERENTIATION BETWEEN THE THREE TYPES OF NETWORK TOPOLOGY WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF THE THREE OF NETWORK TOPOLOGY?
SUMMARY BUS TOPOLOGYDEFINITION ADVANTAGE DISADVANTAGE•All computers •Easy to connect a •Entire network shuts and devices computer or down if connected to peripheral to a linear there is a break in the central cable bus. main cable. •Requires less cable •Terminators are length than required at both a star topology. ends of the backbone cable. •Difficult to identify the problem if the entire network shuts down.
SUMMARY RING TOPOLOGY DEFINITION ADVANTAGE DISADVANTAGE •Cable forms •Data is quickly •Data packets must pass closed ring or transferred without a through every computer loop, with all ‘bottle neck’. between the sender and computers and recipient therefore, thisdevices arranged •The transmission of data is relatively makes it slower. along ring. simple as packets •If any of the nodes fail travel in one direction then the ring is broken only. and data cannot be transmitted successfully. •It is difficult to troubleshoot the ring.
SUMMARY STAR TOPOLOGYDEFINITION ADVANTAGE DISADVANTAGE •Requires more cable •All devices •Easy to install and length connect to a wire. than a linear topology.central device, called hub. •Security can be If the hub or implemented concentrator fails, in the hub/switch. nodes attached are disabled. •Easy to detect faults and to More expensive than remove parts linear bus topologies because of the cost of the concentrators.
SUMMARY MESH TOPOLOGYDEFINITION ADVANTAGE DISADVANTAGE Require more cable •In the mesh •1.Provide redundant then other topology . topology each path between device.. computer areconnected with The network can be Complicated each other by 1.Provide redundant path between device. expanded without implementations.separate cable.. disruption to current user..