Networking Basics - Network Topologies Explained for beginners (Easy Explanation)

 

Networking Basics – Part 2: Network Topologies Explained for Beginners

Network topology is the most important concept of networking. In today's world, every organization selects a topology before designing its network infrastructure. A well-designed topology improves performance, while a poor topology creates issues. If the network design is good, communication is easier, and the network becomes more reliable.

In the previous blog, we discussed networks in detail. When we connect multiple devices, such as computers, servers, and printers, the structure and layout of those connected devices matter a lot. This structure is called network topology.

In this blog, we will deeply understand the concept of network topology and its types in detail. By understanding network topology, a student will be able to design or manage a network in real-life organizations.

What is Network topology?

Network Topology is a map of network design, which refers to the physical and logical arrangements of devices (Nodes) and connections (Links) in a computer system.

This tells us

• How multiple devices are connected in a network
• The structure of cables
• How data travels in a network
• Communication pattern of the network

The design of network topology directly impacts network performance, stability, and reliability.

If the topology is good, the network becomes fast and stable. But if the topology is poorly designed, the network can become slow.

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Types of network topology

Network topology is divided into two categories:

Physical topology

Physical topology shows the actual hardware layout of a network.

In short, it's showing us:

• How cables are designed
• The port devices are connected to
• The physical arrangement of network hardware

This shows the actual physical connection that connects devices together

Before understanding the concept of a structured network, we have to observe the physical topology.

Logical topology

Logical topology shows how data travels within a network. The physical layout and logical layout of a network can be different

For example:

A network is physically designed in a star topology, meaning all devices are connected to a switch, but in a logical way, maybe data is allowed in a bus topology pattern.

This shows that the k pattern of data communications does not necessarily have to match the physical structure of the network

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Major types of network topologies

Networking is commonly divided into 6 major topologies:

• Bus topology
• Star topology
• Ring topology
• Mesh topology
• Tree topology
• Hybrid topology

Let’s understand all these in detail.

Bus topology

Bus topology is one of the oldest and simple topology; in this topology, all computers are connected to a single cable, which is called the backbone cable.

Structure

All devices are connected in a straight line to the backbone cable.

Data flow

A device sends data to a specific device with the address:

• Data is broadcast over the backbone cable
• All devices receive the signal
• But only the device whose address matches accepts the data
• Other devices on the backbone cable ignore the data.

­Advantages

• It has an easy installation
• Require less cabling
• Too simple network design
• Also, low cost.

Bus topology is widely used because of these benefits

Disadvantages

• All the devices go down if the backbone cable fails.
• Troubleshooting is too difficult
• Not made for large networks
• Networks get slower under heavy traffic

Star topology

In a star topology, all devices are connected to a central device; this central device must be a switch, router, or hub.

Star topology is the common topology used in modern networking

Structure

Every device is directly connected to the central switch, which means every device communicates through the central switch.

Data flow

When a device sends data:

• The data goes to the central switch
• And the central switch forwards the data to the correct destination device.
• Due to the central switch, data transfer has become fast and efficient

­Advantages

• It is too easy to manage
• Troubleshooting is easy because network problem getting find easily
• It gives fast performance
• If one device fails, it does not affect the other devices

Disadvantages

• Network getting down if the central switch fails
• Higher cable costs

Ring topology

In ring topology, all devices are connected in a circular manner or in a circular shape.

The layout typically looks like a ring or a circle.

Structure

In this structure, every device is connected to two neighbours.

Data flow

In ring topology Data travels in a specific direction:

In this process:

• Each device receives data and then forwards it to the next device
• Device, next device, next device, destination.

­Advantages

• Low chances of data collision
• All devices get equal network access
• It has structured communication

Disadvantages

• Troubleshooting is difficult
• If one device fails, all the ring divides will be affected

Mesh topology

In mesh topology, every device is directly connected to other device means every device has multiple communication paths available.

Mesh topology consider as a most reliable topology. There are two types of mash topology:

Full mesh

In a full mesh, every device is connected to every other device.

Partial mesh

In a partial mesh, some devices are connected to multiple devices, not all.

Structure:

Data flow:

Data must travel from multiple paths.

­Advantages

• Backup paths available
• Lower risk of network failure
• High redundancy
• If one connection fails, data will travel through an alternative path.

Disadvantages

• A large number of cables require
• Installation is complex
• Very costly

Tree topology

Tree topology is a combination of bus and star topology; it has a hierarchical structure just like a tree.

In simple words:

In tree topology, there is a backbone cable, like bus topology, in which multiple star networks are connected.

Structure:

In this structure, the network is divided into branches.

Advantages

• Good for large networks
• East network expansion
• Hierarchy management is possible

Disadvantages

• Configuration is complex
• If the backbone cable fails, the entire network will be affected

Hybrid topology

Hybrid topology is used in large organizations; it is a combination of multiple topologies, such as:

• Star + bus
• Star + mesh
• Star + ring

Structure:

Advantages

• Good for large enterprises
• Flexible
• Scalable network design

Disadvantages

• Complex network design
• Too much costly
• Network management is difficult

Interview question to remember

Define network topology?

Answer:
Network Topology is a map of network design, which refers to the physical and logical arrangements of devices (Nodes) and connections (Links) in a computer system.

Name all the types of network topology?

Answer:
Networking is commonly divided into 6 major topologies:

• Bus topology
• Star topology
• Ring topology
• Mesh topology
• Tree topology
• Hybrid topology

Tell us the difference between physical and logical topology.

Answer:

Physical topology shows the actual layout of cables and devices; on the other hand, logical topology shows how data flows within the network.

Nowadays, which topology is widely used in modern networks?

Answer:
Star topology is the common topology used in modern networking because it is very easy to manage, stable, and reliable.

If the backbone cable fails in a bus topology, then what happen with the network?

Answer:
All the devices go down if the backbone cable fails because all devices connection depend on the backbone cable.

Some disadvantages of mesh topology?

Answer

• A large number of cables require
• Installation is complex
• Very costly

Define the concept of Hybrid topology?

Answer:
Hybrid topology is used in large organizations; it is a combination of multiple topologies, such as:

• Star + bus
• Star + mesh

Which topology is used by large organizations?

Answer:
Large organizations use a hybrid topology because it is a combination of multiple topologies.

Tell us some disadvantages of ring topology?

Answer:

• Troubleshooting is difficult
• If one device fails, all the ring divides will be affected

Tell us the devices on which star topology depends.

Answer:
Star topology is dependent on multiple devices like switches, routers, and hubs.

How can a single network have different physical and logical topologies?

Answer:
Yes, a network can have different physical and logical topologies. For example, a network can be physically a star but logically a bus.

Tell us a single reason why star topology is better than bus topology?

Answer:
as u know, in a star topology, if one device fails, it does not affect other devices or the network, but in a bus topology is backbone cable fails, the whole network goes down.

Why don’t large enterprises use bus topology?

Answer:
Because bus topology is for small networks, all devices are connected through one backbone cable; if the backbone cable fails, all the devices fails that’s why large enterprises don’t take risks.

Tell us the disadvantages of a hybrid topology?

Answer:

• Complex network design
• Too much costly
• Network management is difficult

Do you know why topology is very important in network design?

Answer:
The design of network topology directly impacts network performance stability and reliability.

If the topology is good, the network becomes fast and stable. But if the topology is poorly designed, the network can become slow.

Can we expand any topology? Which and how?

Answer:
Star topology is easiest to expand because new devices can be added easily by connecting them to the central switch.

Why is the mesh topology too costly?

Answer:
Mesh topology is too costly because it needs a large number of cables to connect devices.

Do u know which topology is used in home and office networks?

Answer:
Yes, star topology is used in home and office networks, which means all devices are connected to a single device, like a router, switch, or hub.

Conclusion

Network topology is a fundamental concept of networking that shows how devices are connected and the direction they travel. Different Topologies are used for different situations, like if you have a small network, then the reliable topology is (star topology), if you have a large enterprise, then (hybrid topology), and if you have a high-reliability network, then (mesh topology).

Understanding of network topology is very important for students and learners who become experts in networking, IT infrastructure, and advanced networking certifications like CCNA.

An ordinary student can gain a good knowledge of network design, troubleshooting, and management.

 

Networking basics series

• Part 1: What is a Network and the Types of Networks
• Part 2: Network topologies explained for beginners
• Part 3: Network devices Explained Deeply for beginners

Read next: Networking Basics - Part 3: Network devices Explained Deeply for beginners

 

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