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Saturday, November 24, 2018

Introduction To Network Topology

Introduction To Network Topology

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Today we are going to discuss about what is network topology, types of network topology and their advantages and disadvantages.
so, guys let’s discuss.

What is Network Topology?

Topology defines the structure how device is connected to the network. Topology can be physical or logical. Physical topology refers to the actual structure of the network. On the other hand, Logical topology defines the way in which data actually passes through the network from one device to another.

Types of Network Topology

1. Single Node Topology
2. Bus Topology
3. Ring Topology 
4. Star Topology
5. Mess Topology
6. Tree Topology
7. Hybrid Topology

Now I am going to explain about each topology one by one.

1. 1. Single Node Topology


Single Node Topology
Single Node Topology
A single node network includes a single device which is directly connected to the server.If a node does not contain files and information needed for operation, it is known as dumb terminal.here you can see guys PC-1 is directly connected to the server and else PC-1 does not have any information to operate it known as Dump terminal.

Advantages

1.It is easy to install, configure and manage.
2.Least expensive, as a Dumb terminal, it is a cheapest computer.
3.Single cable is required as we are connecting only a single device to the server.

Disadvantages

1.Only a single device can be connected in the entire network.
2.Dump terminal is dependent on the server for resource, so this is the biggest disadvantages of single node topology, because without a server the PC is act as a Dumb terminal.

2. Bus Topology

Bus Topology
Bus Topology
In a bus Topology, devices share a common backbone cable to send and receive data.
Bus topology uses a daisy chain scheme to add more devices in a network.In a daisy chain scheme, device-1 is connected to devices-2, devices-2 is connected to devices-3, same like this device-3 is connected to device-4 and the device-4 is connected to device-5. The first and last devices are connected to 50 OHM terminator resistor.

Advantages

1.Easy to connect devices in linear Bus.
2.Requires less cable.
3.Works better for smaller networks.
4.Less expensive than other networks.

Disadvantages

1.Entire network will get affected if there a single break in the main cable.so this is one of the biggest disadvantages of Bus topology, because if the backbone cable fails means entire network will get affected.
2.It is difficult to detect the faulty devices in a Bus topology.
3.Limited number of devices can be attached.
4.here heavy traffic can make the network slow.

3. Ring topology

Ring Topology
Ring Topology
In a ring topology, each device is connected to adjacent device forming a circle.Data flows only in one direction, clock wise or anti clock wise. If the data flows from both directions, we call it partial ring topology Each device in the ring topology acts as a repeater, It amplifies the signal transmission and transmits it to the next devices. If device-1 wants to transmit data to device-3, data must be travel from device-1 through devices-2 and then to its destination at device-3.
  
Advantages

1.Easier to manage as compare to bus topology.
2.It can handle large volume of traffic. Because each device acts as a repeater.
3.It Provides a good communication over a long distance.

Disadvantages

1.More cable are requires as compared to bus topology.
2.One faulty device affects in the entire network.
3.Addition and changes of devices can affect the entire network. Because all the PC are dependent on each other. In this scenario if single device fails means entire whole network will be affected. 

4. Star Topology 

Star Topology
Star Topology
This is one of the best topologies of computer network. In star topology, Multiple devices are connected to a central connection point known as hub or switch.

Advantages

1.Easy to install, configure and manage.
2.Easy to detect faulty device.
3.Easier to expand.
4.connecting or removing devices does not affect the entire whole network.

Disadvantages

1.Requires more cables.
2.In this scenario, If the centralize device hub or switch fails, it means entire network will get affected. Because all the devices are connected and able to communicate only through the centralize device hub or switch.
3.It is more expensive as compare to bus topology.

5. Mesh Topology


Mess Topology
Mess Topology
In a mesh topology, every device is connected to each other. there are two type of mesh topology, Full mess topology and Partial mess topology. In the full mess topology, each device is directly connected to each other. on the other hand, in Partial mesh topology all devices are connected to few devices in a network.

Advantages

1.It Provides multiple paths to send data. So, if a single path fails, it can send data from alternate path, and this is one the biggest advantages of mesh topology.
2.Entire network does not get affected by one faulty device, because it always has alternate path to send data.
3.Centralized management is not required as in star topology.
4.Easy to detect the faulty device.

Disadvantages

1.More cabling is required as compared to Bus, Star and Ring topology.
2.Very expensive as compared to Bus, Star and Ring topology.
3.It is very difficult to re-configure as it is one of the most complicated topology of computer network.

6. Tree Topology 

Tree Topology
Tree Topology
A Tree topology combines the characteristics of linear Bus and Star topology.A Tree topology connects multiple star network with the help of linear Bus backbone cable.as here you can see tree topology are connected with the main backbone cable so like this so it is a combination of a Star topology and Bus topology. Signal from transmitting device first reaches the hub to which it is connected. Hub then transmit the signal to the backbone cable and after that the data travel to the entire network. This is how Tree topology works.

Advantages

1.It is point to point wring for each device.
2.Easy to detect a faulty device.
3.Easy to expand a network.

Disadvantages 

1.More difficult to configure as compare to another topology.
2.Fault in the backbone cable affects the entire network and I thing this is one of the biggest dis-advantages in this topology because if the single backbone cable fails then the whole topology will be affected. 
3.This technology is more expensive than another topology.
  

7. Hybrid Topology 

Hybrid Topology
Hybrid Topology
This is one of the most complicated topology of computer network and it is the combination of all the topology. In Hybrid topology, multiple physical topology is combined to form one large network. As here you can see the diagram. This topology includes Bus topology, Ring topology, Star topology and Mesh topology so it is the combination of all the network topology. Each topology has its own strength and weakness. When different types of topology are combined, then total strength improves the entire network performance.

Advantages

1.It is useful for implementing large networks.
2.This topology can handle large volume of traffic.
3.Here it is easy to detect and remove the faulty devices.

Disadvantages 

1.More cabling is required as compare to all other topology.
2.More expensive than all other topology.
3.It is very complex structure.
4.At last, Installation and reconfiguration is difficult. As I have already told you that it is one of the most complicated topology of computer network.

so, guys this is all about Network topology.I hope this information will be helpful for all.

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