Network topology refers to the physical or logical arrangement of devices and cables in a computer network.
It describes how devices are connected and how data flows between them.
• It affects network performance and speed
• It determines ease of installation and maintenance
• It impacts cost and scalability
• It helps in fault detection and troubleshooting
In a Star topology, all devices are connected to a central device such as a switch or hub.
All communication passes through this central device.
When one device sends data, it goes to the central device first.
The central device then forwards the data to the destination device.
• Home networks
• Office LANs
• Schools and colleges
• Easy to install and manage
• Failure of one cable does not affect others
• Easy to add or remove devices
• Good performance
• Central device failure brings down the entire network
• Requires more cable than bus topology
• Most commonly used topology
• Switch-based LANs use star topology
In a Bus topology, all devices are connected to a single main cable, called the backbone.
Data travels in both directions along the cable.
When a device sends data, the signal travels through the backbone cable.
All devices receive the signal, but only the intended device accepts it.
• Early Ethernet networks
• Small temporary networks
• Easy to implement
• Requires less cable
• Low cost
• Cable failure stops the entire network
• Difficult to troubleshoot
• Performance decreases as devices increase
• Uses terminators at both ends
• Mostly obsolete today
In a Ring topology, each device is connected to two other devices, forming a circular path.
Data travels in one direction around the ring.
Data passes from one device to the next until it reaches the destination.
Each device acts as a repeater.
• Older LAN networks
• Token Ring networks
• No data collision
• Equal access to network for all devices
• Failure of one device breaks the ring
• Difficult to troubleshoot
• Not flexible
• Uses token passing
• Rarely used today
In a Mesh topology, every device is connected to every other device.
It can be full mesh or partial mesh.
Data can travel through multiple paths, ensuring high reliability.
• WAN networks
• Internet backbone
• Military and critical systems
• Very high reliability
• No single point of failure
• Excellent fault tolerance
• Very expensive
• Complex installation
• Requires many cables
• Best for reliability
• Poor cost efficiency
Tree topology is a hierarchical structure that combines star and bus topologies.
It looks like an inverted tree.
Multiple star networks are connected to a main backbone cable.
• Large organizations
• Campus networks
• Scalable
• Easy expansion
• Good management structure
• Backbone failure affects entire network
• Complex configuration
• Used in large networks
• Hierarchical design
Hybrid topology is a combination of two or more different topologies.
It is designed to meet specific network requirements.
Different sections of the network use different topologies, but they work together.
• Large enterprises
• Modern networks
• Flexible design
• Scalable
• Reliable
• Complex design
• High cost
• Most modern networks are hybrid
| Topology | Cost | Reliability | Usage |
| Star | Medium | High | Most common |
| Bus | Low | Low | Obsolete |
| Ring | Medium | Low | Rare |
| Mesh | Very High | Very High | WAN |
| Tree | Medium | Medium | Campus |
| Hybrid | High | High | Enterprise |
• Star → Central device
• Bus → Single cable
• Ring → Circular path
• Mesh → Every device connected
• Tree → Hierarchy
• Hybrid → Mix of all
If interviewer asks:
👉 “Which topology is best?”
Say confidently:
Star topology is the most commonly used because it is easy to manage, scalable, and provides good performance, while hybrid topology is used in large modern networks.is used in large modern networks.
Learn Network topology with industry concepts, practical understanding, and career guidance.
👇
Click below to explore the 45-Day Job-Oriented Internship and continue your learning journey.
