Network topology: Physical and logical layout of network. Physical topology: How the cables are used . Logical topology: How the messages travel

2. DEPAULS INSTITUTE OF SCIENCE AND
TECHNOLOGY , ANGAMALY
SCHOOL OF MANAGEMENT
SEMINAR
“NETWORK TOPOLOGY”
PRESENTED BY
JENCY P.J
NO: 25
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3. OUTLINE
• INTRODUCTION
• NETWORK TOPOLOGY
• TYPES OF NETWORK TOPOLOGY
• CONCLUSION
• REFERNECE
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4. INTRODUCTION
• Network : Interconnection of 2 or more
independent computer and peripherals.
• Topology : The way in which the computer are
interconnected together.
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5. NETWORK TOPOLOGY
• Network topology: Physical and logical layout
of network.
 Physical topology: How the cables are
used .
Logical topology: How the messages
travel
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6. TYPES OF NETWORK
TOPOLOGY
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• Bus topology
• Ring topology
• Star topology
• Tree topology

7. BUS TOPOLOGY
• A bus topology is multipoint.
• All computers and devices connected to central cable
or bus.
• Here one long cable act as a backbone to link all the
devices are connected to the backbone by drop lines
and taps.
• Drop line- is the connection b/w the devices and the
cable.
• Tap- is the splitter that cut the main link.
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8. Cont.….
• It transmits data only in one direction.
• Every device is connected to
a single cable.
• Consists of a main run of cable
with a terminator at each end.
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9. Cont.….
Advantages
• It is cost effective.
• Cable required is least compared to other
network topology.
• Used in small networks.
• It is easy to understand.
• Easy to expand joining two cables together
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10. Cont.….
Disadvantages
• Cables fails then whole network fails.
• If network traffic is heavy or nodes are more
the performance of the network decreases.
• Cable has a limited length.
• It is slower than the ring topology.
Application
• Most computer motherboard.
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11. RING TOPOLOGY
• Cable forms closed ring or loop, with all computers
and devices arranged along ring
• Here each device has a dedicated connection with two
devices on either side.
• Data travels from device to device around entire ring,
in one direction.
• The signal is passed in one direction from device to
device until it reaches the destination and each device
have repeater.
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12. Cont.…..
• A number of repeaters are
used and the transmission
is unidirectional.
• Date is transferred in a
sequential manner that is
bit by bit.
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13. Dual ring topology
Advantages
• Speed and reliability
• Un interrupted long distance
communication
• Terminators are not required
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14. Cont.….
Advantages:
• Easy to install.
• Easy to reconfigure.
• Fault identification is easy.
Disadvantages:
• Unidirectional traffic.
• Break in a single ring can break entire
network.
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15. STAR TOPOLOGY
• Here each device has a dedicated point-to-
point link to the central controller called
“Hub”
• There is no direct traffic between devices
• The transmission are occurred only through
the central “hub”.
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16. Cont.…
• Every node has its own dedicated connection to the
hub.
• Acts as a repeater for
data flow.
• Can be used with twisted
pair, Optical Fibre or coaxial
cable.
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17. Cont.…
Advantages
• Less expensive
• Installation and configuration are easy.
• Robustness
• Easy to fault identification & to remove parts.
• No disruptions to the network then connecting
/ removing devices
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18. Cont.…
Disadvantages
• Even it requires less cabling then mesh when
compared with other topologies it still large
• Dependency
Applications
• Star topology used in Local Area Network.
• High speed LAN often used STAR.
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19. TREE TOPOOGY
• Alternatively referred to as a star bus topology
and hierarchical topology.
• A tree topology connects multiple star
networks to other star networks.
• It has a root node and all other nodes are
connected to it forming a hierarchy.
• It should at least have three levels to the
hierarchy.
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20. Cont.….
• Ideal if workstations are located in groups.
• Used in Wide Area Network.
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21. Cont.….
Advantages
• Extension of bus and star topologies.
• Expansion of nodes is possible and easy.
• Easily managed and maintained.
• Error detection is easily done.
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22. Cont.….
Disadvantages
• Heavily cabled.
• Costly.
• If more nodes are added maintenance is
difficult.
• Central hub fails, network fails
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23. CONCLUSION
• Knowledge of networking topologies is of core
importance of computer networking design.
• which structure or topology is best for which
organization or business.
• Network Topology brings inherent advantages
and disadvantages to any system under study.
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24. REFERNCE
[1]http://www.ijetae.com/files/Volume3Issue1/I
JETAE_0113_84.pdf
[2] “Computer network and internets” by
Douglas E. Comer and M.S Narayanana
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