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computer network topologies explained

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Network topology is the structure of the network, it can be physical structure or logical structure.

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A network topology describes the physical connections and logical communication pathways between object in a network. Topologies are used to describe connections between computers in a network, between routers in a network, or even between wide area network connections.

Topologies come in two varieties, physical and logical.

Physical Topology

This describe the way in which the devices are connected together.

Logical Topology

This describes how the devices communicate or the shape of the communication path. In many cases, the physical and logical topology are the same-but not always.

Physical topology explained

This defines the physical connections between the devices and the shape that these connections form.

Implementing a bus topology

The bus topology was one of the earliest physical topologies to be implemented. In this topology the devices are connected to one another in a straight line.

In bus topology coaxial cable is used and comes in two types that exhibit different characteristics.

Thicknet: is thicker, less flexible, and more expensive but can be up to 500 meters long without attenuation.

Thinet: is smaller gauge, more flexible, and less expensive but can be up to only 185 meters long without attenuation.

Advantages of the bust topology.

Disadvantages of the bus topology

 Attenuation(weakening of the signal); this is the word that means signal is weak; when an electrical signal travels down a cable, it meets resistance in the cable that can be measured in ohms. This resistance weakens or attenuates the signal.

If the signal becomes weak at the destination will be impossible to read the data, the result is usually corrupted or garbled data.

Implement a ring topology

Just like its name sound. The devices are connected to one another as they are in a bus topology, except that the cable loops around and forms a closed circle resemble a ring shape.

When a computer transmits on a ring network. The transmission is usually sent in only one direction from where the computer is position on the bus. The transmission locates the destination computer by IP or MAC address. Each device on the ring examines the signal but all except the computer to which the packet is addressed will ignore it.

Advantages of ring topology

Disadvantages of the ring topology

 Implement a star topology

This is the most commonly used topology in network today. All of the device are connected to a central device and communicate through the central device. This device may be either a hub or a switch.

Advantages of star topology

Disadvantages of the star topology

Implement a mesh topology

Each computer has an individual connection to every other computer. This topology is difficult and expensive to implement but offers the most fault tolerance than any other topology.

The mesh topology requires that each computer have the hardware to support multiple network connections.

Advantages of the mesh topology

Disadvantages of the mesh topology

Implementing a hybrid topology

This is the one that is the combination of two or more topologies combine to produce one topology

Advantages of hybrid topology

disadvantages of hybrid topology

Implementing a point-to-point topology

This is one which two devices are connected to one another directly, with no other devices on the connection.

Implementing a point-to-multipoint topology

Is one in which a single physical connection on one router is connected to more than one device on the other end.

Designing the logical topology

The logical topology defines the communication process between the devices and the shape that these communication flows form.

 

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