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What is Topology?

Network topologies describe the methods in which all the elements of a network are mapped. The topology term refers to both the physical and logical layout of a network.

Nội dung chính

What is Topology?Types of Networking TopologiesPhysical topology:Logical topology:Point to Point (P2P)Advantages:Disadvantages:Bus TopologyAdvantages:Disadvantages:Ring TopologyAdvantages:Disadvantages:Star TopologyAdvantages:Disadvantages:Mesh TopologyTypes of Mesh Topology:Advantages:Disadvantages:Tree TopologyAdvantages:Disadvantages:Hybrid TopologyAdvantages:Disadvantages:How to select a Network Topology?You Might Like:

In this network topology tutorial, we will explain:

What is Topology?Type of Network TopologyPoint to PointBus TopologyRing TopologyStar TopologyMesh TopologyTree TopologyHybrid TopologyHow to select a Network Topology?

Types of Networking Topologies

Two main types of network topologies in computer networks are 1) Physical topology 2) Logical topology

Physical topology:

This type of network is an actual layout of the computer cables and other network devices

Logical topology:

Logical topology gives insights about networks physical design.

Different types of Physical Topologies are:

P2P TopologyBus TopologyRing TopologyStar TopologyTree TopologyMesh TopologyHybrid Topology

Network Topology Diagram

Lets learn each topology in detail:

Point to Point (P2P)

Point-to-point topology is the easiest of all the network topologies. In this method, the network consists of a direct link between two computers.

P2P Topology Diagram

Advantages:

This is faster and highly reliable than other types of connections since there is a direct connection.No need for a network operating systemDoes not need an expensive server as individual workstations are used to access the filesNo need for any dedicated network technicians because each user sets their permissions

Disadvantages:

The biggest drawback is that it only be used for small areas where computers are in close proximity.You cant back up files and folders centrallyThere is no security besides the permissions. Users often do not require to log onto their workstations.

Bus Topology

Bus Topology Diagram

Bus topology uses a single cable which connects all the included nodes. The main cable acts as a spine for the entire network. One of the computers in the network acts as the computer server. When it has two endpoints, it is known as a linear bus topology.

Advantages:

Here are pros/benefits of using a bus topology:

Cost of the cable is very less as compared to other topology, so it is widely used to build small networks.Famous for LAN network because they are inexpensive and easy to install.It is widely used when a network installation is small, simple, or temporary.It is one of the passive topologies. So computers on the bus only listen for data being sent, that are not responsible for moving the data from one computer to others.

Disadvantages:

Here are the cons/drawbacks of bus topology:

In case if the common cable fails, then the entire system will crash down.When network traffic is heavy, it develops collisions in the network.Whenever network traffic is heavy, or nodes are too many, the performance time of the network significantly decreases.Cables are always of a limited length.

Ring Topology

Ring Topology Diagram

In a ring network, every device has exactly two neighboring devices for communication purpose. It is called a ring topology as its formation is like a ring. In this topology, every computer is connected to another computer. Here, the last node is combined with a first one.

This topology uses token to pass the information from one computer to another. In this topology, all the messages travel through a ring in the same direction.

Advantages:

Here are pros/benefits of ring topology:

Easy to install and reconfigure.Adding or deleting a device in-ring topology needs you to move only two connections.The troubleshooting process is difficult in a ring topology.Failure of one computer can disturb the whole network.Offers equal access to all the computers of the networksFaster error checking and acknowledgment.

Disadvantages:

Here are drawbacks/cons of ring topology:

Unidirectional traffic.Break in a single ring can risk the breaking of the entire networkModern days high-speed LANs made this topology less popular.In the ring, topology signals are circulating all times, which develops unwanted power consumption.It is very difficult to troubleshoot the ring network.Adding or removing the computers can disturb the network activity.

Star Topology

Star Topology Diagram

In the star topology, all the computers connect with the help of a hub. This cable is called a central node, and all other nodes are connected using this central node. It is most popular on LAN networks as they are inexpensive and easy to install.

Advantages:

Here are pros/benefits of start topology:

Easy to troubleshoot, set up, and modify.Only those nodes are affected, that has failed. Other nodes still work.Fast performance with few nodes and very low network traffic.In Star topology, addition, deletion, and moving of the devices are easy.

Disadvantages:

Here are cons/drawbacks of using Star:

If the hub or concentrator fails, attached nodes are disabled.Cost of installation of star topology is costly.Heavy network traffic can sometimes slow the bus considerably.Performance depends on the hubs capacityA damaged cable or lack of proper termination may bring the network down.

Mesh Topology

The mesh topology has a unique network design in which each computer on the network connects to every other. It is develops a P2P (point-to-point) connection between all the devices of the network. It offers a high level of redundancy, so even if one network cable fails, still data has an alternative path to reach its destination.

Types of Mesh Topology:

Partial Mesh Topology:

Partially Connected Mesh Topology

Full Mesh Topology:

Fully Connected Mesh Topology

Advantages:

Here, are pros/benefits of Mesh topology

The network can be expanded without disrupting current users.Need extra capable compared with other LAN topologies.No traffic problem as nodes has dedicated links.Dedicated links help you to eliminate the traffic problem.A mesh topology is robust.It has multiple links, so if any single route is blocked, then other routes should be used for data communication.P2P links make the fault identification isolation process easy.It helps you to avoid the chances of network failure by connecting all the systems to a central node.Every system has its privacy and security.

Disadvantages:

Installation is complex because every node is connected to every node.It is expensive due to the use of more cables. No proper utilization of systems.Complicated implementation.It requires more space for dedicated links.Because of the amount of cabling and the number of input-outputs, it is expensive to implement.It requires a large space to run the cables.

Tree Topology

Tree topologies have a root node, and all other nodes are connected which form a hierarchy. So it is also known as hierarchical topology. This topology integrates various star topologies together in a single bus, so it is known as a Star Bus topology. Tree topology is a very common network which is similar to a bus and star topology.

Advantages:

Here are pros/benefits of tree topology:

Failure of one node never affects the rest of the network.Node expansion is fast and easy.Detection of error is an easy processIt is easy to manage and maintain

Disadvantages:

Here are cons/drawback of tree topology:

It is heavily cabled topologyIf more nodes are added, then its maintenance is difficultIf the hub or concentrator fails, attached nodes are also disabled.

Hybrid Topology

Hybrid topology combines two or more topologies. You can see in the above architecture in such a manner that the resulting network does not exhibit one of the standard topologies.

For example, as you can see in the above image that in an office in one department, Star and P2P topology is used. A hybrid topology is always produced when two different basic network topologies are connected.

Advantages:

Here, are advantages/pros using Hybrid topology:

Offers the easiest method for error detecting and troubleshootingHighly effective and flexible networking topologyIt is scalable so you can increase your network size

Disadvantages:

The design of hybrid topology is complexIt is one of the costliest processes

How to select a Network Topology?

Here are some important considerations for selecting the best topology to create a network in your organization:

Bus topology is surely least expensive to install a network.If you want to use a shorter cable or you planning to expand the network is future, then star topology is the best choice for you.Fully mesh topology is theoretically an ideal choice as every device is connected to every other device.If you want to use twisted pair cable for networking, then you should build star topologies.

Summary

TopologyWhat it isImageP2PThe network consists of a direct link between two computersBusUses a single cable which connects all the included nodesRingEvery device has exactly two neighboring devices for communication purposeStarAll the computers connect with the help of a hub.MeshThe mesh topology has a unique network design in which each computer on the network connects to every other.
TreeTree topologies have a root node, and all other nodes are connected which forming a hierarchy.Hybrid TopologyHybrid topology combines two or more topologies

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