Difference between Star topology and Bus topology

The way a network's links and nodes are connected is referred to as network topology. Physical topology refers to the actual signal transmission medium, whereas logical topology refers to the manner in which data passes through the network between devices, regardless of their physical connectivity.

Star Topology

A star topology is a network configuration where all devices connect to a central hub or switch, creating a star-shaped pattern.

• Central hub control − One central hub manages all network functions and acts as a data flow repeater.

• Individual connections − Each host connects directly to the hub through dedicated transmission lines.

• Isolated failure impact − If one host's connection fails, only that host is affected while the rest of the network remains operational.

• Hub-dependent communication − All data passes through the central hub before reaching its destination.

Bus Topology

In bus topology, all devices connect to a single shared communication line called the backbone cable. Data transmitted by any device is received by all other devices on the network.

• Single backbone cable − All devices connect to one main cable through drop lines and taps.

• Shared medium access − Devices use protocols like CSMA (Carrier Sense Multiple Access) to coordinate transmission.

• Equal transmission priority − All stations have the same priority for accessing the shared bus.

• Limited scalability − The number of devices and maximum cable length are restricted due to signal degradation.

Comparison of Star and Bus Topology

Conclusion

Star topology offers better fault tolerance and performance through centralized control, while bus topology provides a cost-effective solution for smaller networks. The choice depends on network size, budget, and reliability requirements.