Network Topologies: Star vs Mesh vs Hybrid

• Central device is a single point of failure
• Requires more cabling than some topologies

In IB exams, star topology is commonly linked to:

• School networks
• Office LANs

Mesh Topology

In a mesh topology, devices are connected to multiple other devices.

How It Works

• Data can take multiple paths to reach its destination
• Full mesh connects every device to every other device

Advantages

• Very high reliability
• No single point of failure
• Data can be rerouted if a connection fails

Disadvantages

• Expensive to install
• Complex to manage
• Requires a large amount of cabling

Mesh topology is often associated with:

• Critical systems
• Military or emergency networks

Hybrid Topology

A hybrid topology combines two or more different topologies.

How It Works

• Different sections of a network use different topologies
• These sections are connected together

Advantages

• Flexible and scalable
• Can be customised to meet specific needs
• Combines strengths of multiple topologies

Disadvantages

• More complex design
• Higher cost
• Requires careful planning

Hybrid topologies are common in:

• Large organisations
• Enterprise networks
• Campuses

Comparing Star, Mesh, and Hybrid Topologies

Strong IB answers compare topologies clearly:

• Star: simple, centralised, easy to manage
• Mesh: highly reliable, expensive, complex
• Hybrid: flexible, scalable, complex

Students should link topology choice to requirements.

How Topologies Appear in IB Exams

IB questions may ask students to:

• Identify a suitable topology for a scenario
• Explain advantages and disadvantages
• Compare two topologies
• Discuss reliability and fault tolerance

Justifying choices earns higher marks.

Common Student Mistakes

Students often:

• Forget the central device in star topology
• Confuse mesh with peer-to-peer networks
• Describe hybrid too vaguely
• Ignore cost and scalability

Precision matters.

Final Thoughts

Network topologies determine how data flows, how reliable a network is, and how easy it is to manage. Star, mesh, and hybrid topologies each solve different problems, and understanding their trade-offs is essential for IB Computer Science success.

Learn the differences between HDDs, SSDs, and NAS for IB Computer Science, including performance, cost, and use cases.