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Basic Concepts of Computer Networks and Network Topology ASHIMA KALRA.

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Presentation on theme: "Basic Concepts of Computer Networks and Network Topology ASHIMA KALRA."— Presentation transcript:

1 Basic Concepts of Computer Networks and Network Topology ASHIMA KALRA

2  Definition of topology  Types of Network topology -Bus topologyBus topology -Ring topologyRing topology -Star topologyStar topology -Mesh topologyMesh topology  Advatages of topologies  Disadvantages of topologies

3  The physical topology of a network refers to the configuration of cables, computers and other peripherals.

4 TYPES OF NETWORK TOPOLOGY Bus network. Ring network. Star network.

5 BUS TOPOLOGY All computers and devices connected to central cable or bus. Consists of a main run of cable with a terminator at each end. Popular on LANs because they are inexpensive and easy to install.

6 BUS TOPOLOGY

7 BACK

8 RING TOPOLOGY Cable forms closed ring or loop, with all computers and devices arranged along ring. Data travels from device to device around entire ring, in one direction. Primarily is used for LANs, but also is used in WANs.

9 RING TOPOLOGY BACK

10 STAR TOPOLOGY All devices connect to a central device, called hub. All data transferred from one computer to another passes through hub.

11 STAR TOPOLOGY

12 BACK

13 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. MESH TOPOLOGY BACK

14 DIFFERENTIATION BETWEEN THE THREE TYPES OF NETWORK TOPOLOGY

15 SUMMARY BUS TOPOLOGY DEFINITION All computers and devices connected to central cable DEFINITION All computers and devices connected to central cable ADVANTAGE Easy to connect a computer or peripheral to a linear bus. ADVANTAGE Easy to connect a computer or peripheral to a linear bus. Requires less cable length than a star topology. Requires less cable length than a star topology. DISADVANTAGE Entire network shuts down if there is a break in the main cable. DISADVANTAGE Entire network shuts down if there is a break in the main cable. Terminators are required at both ends of the backbone cable. Terminators are required at both ends of the backbone cable. Difficult to identify the problem if the entire network shuts down. Difficult to identify the problem if the entire network shuts down.

16 SUMMARY RING TOPOLOGY DEFINITION Cable forms closed ring or loop, with all computers and devices arranged along ring. DEFINITION Cable forms closed ring or loop, with all computers and devices arranged along ring. ADVANTAGE Data is quickly transferred without a ‘bottle neck’. ADVANTAGE Data is quickly transferred without a ‘bottle neck’. The transmission of data is relatively simple as packets travel in one direction only. The transmission of data is relatively simple as packets travel in one direction only. DISADVANTAGE Data packets must pass through every computer between the sender and recipient therefore, this makes it slower. DISADVANTAGE Data packets must pass through every computer between the sender and recipient therefore, this makes it slower. If any of the nodes fail then the ring is broken and data cannot be transmitted successfully. It is difficult to troubleshoot the ring. It is difficult to troubleshoot the ring.

17 SUMMARY DEFINITION All devices connect to a central device, called hub. DEFINITION All devices connect to a central device, called hub. ADVANTAGE Easy to install and wire. ADVANTAGE Easy to install and wire. Security can be implemented in the hub/switch. Security can be implemented in the hub/switch. DISADVANTAGE Requires more cable length than a linear topology. DISADVANTAGE Requires more cable length than a linear topology. If the hub or concentrator fails, nodes attached are disabled. If the hub or concentrator fails, nodes attached are disabled. More expensive than linear bus topologies because of the cost of the concentrators. STAR TOPOLOGY Easy to detect faults and to remove parts Easy to detect faults and to remove parts

18 1.Provide redundant path between device. SUMMARY DEFINITION In the mesh topology each computer are connected with each other by separate cable.. DEFINITION In the mesh topology each computer are connected with each other by separate cable.. ADVANTAGE 1.Provide redundant path between device.. ADVANTAGE 1.Provide redundant path between device.. The network can be expanded without disruption to current user.. DISADVANTAGE Require more cable then other topology. DISADVANTAGE Require more cable then other topology. Complicated implementations. MESH TOPOLOGY

19 BACK


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