Network topology

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What is network topology? ❓💡

- Network Topology is the schematic description of a network arrangement, connecting various nodes(sender and receiver) through lines of connection.

First, BUS TOPOLOGY 🚌

Bus topology is a network type in which every computer and network device is connected to single cable. When it has exactly two endpoints, then it is called Linear Bus topology.

Features of Bus Topology

1. It transmits data only in one direction.
2. Every device is connected to a single cable

Advantages of Bus Topology

1. It is cost effective.
2. Cable required is least compared to other network topology.
3. Used in small networks.
4. It is easy to understand.
5. Easy to expand joining two cables together.

Disadvantages of Bus Topology

1. Cables fails then whole network fails.
2. If network traffic is heavy or nodes are more the performance of the network decreases.
3. Cable has a limited length.
4. It is slower than the ring topology.

Next, RING TOPOLOGY 💍

It is called ring topology because it forms a ring as each computer is connected to another computer, with the last one connected to the first. Exactly two neighbours for each device.

Features of Ring Topology

1. A number of repeaters are used for Ring topology with large number of nodes, because if someone wants to send some data to the last node in the ring topology with 100 nodes, then the data will have to pass through 99 nodes to reach the 100th node. Hence to prevent data loss repeaters are used in the network.
2. The transmission is unidirectional, but it can be made bidirectional by having 2 connections between each Network Node, it is called Dual Ring Topology.
3. In Dual Ring Topology, two ring networks are formed, and data flow is in opposite direction in them. Also, if one ring fails, the second ring can act as a backup, to keep the network up.
4. Data is transferred in a sequential manner that is bit by bit. Data transmitted, has to pass through each node of the network, till the destination node.

Advantages of Ring Topology

1. Transmitting network is not affected by high traffic or by adding more nodes, as only the nodes having tokens can transmit data.
2. Cheap to install and expand

Disadvantages of Ring Topology

1. Troubleshooting is difficult in ring topology.
2. Adding or deleting the computers disturbs the network activity.
3. Failure of one computer disturbs the whole network.

Then, STAR TOPOLOGY ⭐

In this type of topology all the computers are connected to a single hub through a cable. This hub is the central node and all others nodes are connected to the central node.

Features of Star Topology

1. Every node has its own dedicated connection to the hub.
2. Hub acts as a repeater for data flow.
3. Can be used with twisted pair, Optical Fibre or coaxial cable.

Advantages of Star Topology

1. Fast performance with few nodes and low network traffic.
2. Hub can be upgraded easily.
3. Easy to troubleshoot.
4. Easy to setup and modify.
5. Only that node is affected which has failed, rest of the nodes can work smoothly.

Disadvantages of Star Topology

1. Cost of installation is high.
2. Expensive to use.
3. If the hub fails then the whole network is stopped because all the nodes depend on the hub.
4. Performance is based on the hub that is it depends on its capacity.

After that, MESH TOPOLOGY 💢

It is a point-to-point connection to other nodes or devices. All the network nodes are connected to each other. Mesh has n(n-1)/2 physical channels to link n devices.

There are two techniques to transmit data over the Mesh topology, they are :

1. Routing
2. Flooding

Routing

In routing, the nodes have a routing logic, as per the network requirements. Like routing logic to direct the data to reach the destination using the shortest distance. Or, routing logic which has information about the broken links, and it avoids those node etc. We can even have routing logic, to re-configure the failed nodes.

Flooding

In flooding, the same data is transmitted to all the network nodes, hence no routing logic is required. The network is robust, and the its very unlikely to lose the data. But it leads to unwanted load over the network.

Types of Mesh Topology

1. Partial Mesh Topology : In this topology some of the systems are connected in the same fashion as mesh topology but some devices are only connected to two or three devices.
2. Full Mesh Topology : Each and every nodes or devices are connected to each other.

Features of Mesh Topology

1. Fully connected.
2. Robust.
3. Not flexible.

Advantages of Mesh Topology

1. Each connection can carry its own data load.
2. It is robust.
3. Fault is diagnosed easily.
4. Provides security and privacy.

Disadvantages of Mesh Topology

1. Installation and configuration is difficult.
2. Cabling cost is more.
3. Bulk wiring is required.

Furthermore, TREE TOPOLOGY 🌲

It has a root node and all other nodes are connected to it forming a hierarchy. It is also called hierarchical topology. It should at least have three levels to the hierarchy.

Features of Tree Topology

1. Ideal if workstations are located in groups.
2. Used in Wide Area Network.

Advantages of Tree Topology

1. Extension of bus and star topologies.
2. Expansion of nodes is possible and easy.
3. Easily managed and maintained.
4. Error detection is easily done.

Disadvantages of Tree Topology

1. Heavily cabled.
2. Costly.
3. If more nodes are added maintenance is difficult.
4. Central hub fails, network fails.

Last but not least, HYBRID TOPOLOGY 🌐

It is two different types of topologies which is a mixture of two or more topologies. For example if in an office in one department ring topology is used and in another star topology is used, connecting these topologies will result in Hybrid Topology (ring topology and star topology).

Features of Hybrid Topology

1. It is a combination of two or topologies
2. Inherits the advantages and disadvantages of the topologies included

Advantages of Hybrid Topology

1. Reliable as Error detecting and trouble shooting is easy.
2. Effective.
3. Scalable as size can be increased easily.
4. Flexible.

Disadvantages of Hybrid Topology

1. Complex in design.
2. Costly.

Done! Thats all 🎉 thank you 😉😉

All about internet

Hi everybody! 🙋🌹🌈

Why do we need internet? 📶

The Internet has changed our lives. In fact, people spend more and more hours on the Internet the longer they have been using it. Which means a great deal in terms of addictiveness and reliance. But although it may seem obvious, I answer the question, “Why do people use it?” here.

 If you think that you have something to add to this list, please do so in the comment section below 😉

Top 5 Reasons People Use The Internet

1. Information – The Internet is arguably one of the most successful and useful tools mankind has ever created. It is, in fact, the largest library ever created, and is growing daily. Although you need to always be careful of your sources, the Internet is THE modern source of information, delivered in multiple media: written word, visual graphics and images, video, and audio have changed the way that we humans look for and find information.

2. Communication – People use the Internet to communicate with one another. Software has made it possible to stream voice and video across the world with minimal delay, and email has become the main means of communicating for many a modern person. Without the Internet, it would be both more expensive and slower to maintain personal and professional relationships.

3. Entertainment – Many people use the Internet to enjoy themselves and to engage in personal interests. In recent years, multiple player games and virtual worlds have engaged the time and money of many. Plus, video and music are easy to find, stream and download…plus, the medium encourages feedback! Indeed, Internet use can go too far. But how can you know if you’re addicted to the Internet? We list the criteria and signs of Internet addiction in the link above.

4. Work – The Internet provides an alternative to 9-5 workdays, as more and more people can work from home, or “telecommute”. Plus, a growing number of people are making a living from the Internet itself, wither becoming experts in how people search the Internet, providing IT or web development services, or specializing in Internet marketing.

5. School – More and more elementary, high school and university curricula require use of the Internet for school work.

If you think that you may be an Internet addict, there is help out there for you. If you want to explore the deeper emotional and psychological issues for compulsive use of the Internet, first start by asking for help from your family doctor.

S/He may refer you to a mental health specialist or center for technology addictions in your area. Or, if there are no specialists that live in your area, you might even consider videoconferencing, a form of distance psycho therapy that is starting to help people, no matter where you are.

Whatever the case, you may need help to uncover the real reasons behind your reliance on the Internet, and to learn how to cut back and monitor Internet use for a healthy mind.

🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹