Bus Topology

Bus Topology

What is Bus Topology?

All devices connect to a single main cable (the "bus" or "backbone"). Data travels along the bus, and all devices receive the transmission, but only the intended recipient processes it.

How It Works:

• Backbone cable: One main cable runs through the building
• Tapped connections: Devices tap into the backbone cable
• Broadcast: Data sent by one device is seen by ALL devices
• Terminators: Special resistors at both ends prevent signal reflection

Bus Topology Advantages:

• Cheap: Uses minimal cable - just one backbone
• Easy to install: Simple to set up for small networks
• No central device needed: No expensive hub or switch required
• Easy to extend: Just add a new device to the backbone

Bus Topology Disadvantages:

• Single point of failure: If backbone cable breaks, ENTIRE network fails
• Performance degrades: More devices = more collisions = slower network
• Difficult troubleshooting: Hard to locate cable breaks
• Limited cable length: Signal degrades over long distances
• Security issues: All devices can see all traffic
• Largely obsolete: Rarely used in modern networks

Historical Note:

Bus topology was popular in the 1980s-1990s (10BASE2, 10BASE5 Ethernet), but has been replaced by star topology in modern networks due to reliability and performance issues.