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WELCOMETO

STUDIES

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PREPAREDBy

A. R.M.DELOWAR HOSSAIN

CLASS: XIIFor

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Lesson DeclarationWhat I am going to teach. Can you guess ?

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Learning goals

By the end of the lesson, learners will be able to explain:

Computer Network

Network Topology

Different Network Topology

Bus Star

Ring Mesh

Tree

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Bus Topology

A small bus network is shown in the graphic below.

bus.mkv

Workstation

PrinterTerminator

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Bus Topology

Advantages:1. Very useful for small network.2. It takes less cost as it requires less cables.3. It is easy to manage and easy to understand.4. It can be extended by using BNC Barrel Connector.5. Repeater can be used to increase signal performance.

1. At a time only one computer can send message.2. Barrel connector makes the signal weak.3. Cable breaking at any point cannot be identified easily.

Disadvantages:

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Star Topology

A small star network is shown in the graphic below.

star.mkv

star1.mkv

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Star Topology

Advantages:

1. Large no. of computers can be added by using multiple hub.

2. Monitoring of network can be done by using intelligent Hub.

3. Trouble shooting task is simple.4. The occurrence of failure of one computer in the network

does not create any problem to other computer performance.

1. Whole networks become out of order if the central point fails.

2. It requires more cable because every PC is connected to Hub by using cable.

3. It is expensive.

Disadvantages:

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Ring Topology

A small ring network is shown in the graphic below.

ring.mkv

token ring.mkv

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Ring Topology

Advantages:

1. Every computer gets equal priority to access the network as token passes every computer.

2. Network degradation is same for all computer for having equal priority.

1. Network becomes out of order if any computer fails in the ring.

2. Troubleshooting task is difficult.3. Network activities hamper when any computer is added

or removed in the network.

Disadvantages:

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Mesh Topology

A small Mesh network is shown in the graphic below.

mesh1.mkv

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Mesh Topology

Advantages:1. Each host has its own connection to every other host. 2. Used in situations where communication must not be

interrupted.3. It is fault tolerant , i.e if any connection become fails,

computer can communicate.

1. It requires huge amount of cable.2. It is difficult to install and difficult to manage.3. Cable breaking at any point cannot be identified easily.

Disadvantages:

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Tree Topology

A small Tree network is shown in the graphic below.

tree topo.mkv

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Tree Topology

Advantages:1. It is scalable. Secondary devices allow more devices to be

connected to a central node. 2. Point to point connection of devices.3. It is more manageable hence easier fault identification

and isolation.

1. Maintenance of the network may be an issue when the network spans a great area.

2. Since it is a variation of bus topology, if the backbone fails, the entire network is crippled.

Disadvantages:

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Any Question

?

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Group Work

Group A: Identify different topology.

Group B: Advantage of different topology.

Group C: Disadvantage of different topology.

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1. What do you mean by network topology ?

2. What do you mean by computer network?

3. Which network topology is Expensive?

Evaluation

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1. What do you mean by network topology ?

2. Write down the advantage and disadvantage of different topology.

3. Explain the operation of Star Topology with figure?

Home Work

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Message

Precaution

While preparing networking cables for creating computer networks such as LANs (Local Area Networks) one has to be very careful and precise.

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