Topology Selection Criteria and Performance Evaluation
When a network engineer designs a computer network for a new college, hospital, or corporate office, they cannot just pick a topology at random. They evaluate several technical and financial criteria.
1. Key Criteria for Selecting a Network Topology
5 Key Topology Selection Factors
1. Installation Cost
Cable length, switches, hubs, and labor costs
2. Reliability & Fault Tolerance
Can the network continue operating if one cable is cut?
3. Ease of Troubleshooting
How fast can an engineer pinpoint a broken wire?
4. Scalability (Future Growth)
How easy is it to add 50 new computers next year?
5. Data Traffic Volume
Can it handle heavy file transfers without collisions?
2. In-Depth Evaluation Matrix for Exams
| Evaluation Criterion | Bus Topology | Star Topology | Ring Topology | Mesh Topology | Tree Topology |
|---|---|---|---|---|---|
| Cable Length | Very Low | Moderate | Moderate | Extremely High | Moderate to High |
| Hardware Cost | Lowest (No switches) | Moderate (Needs switch) | Low to Moderate | Highest | Moderate |
| Ease of Setup | Very Easy | Easy | Moderate | Very Complex | Moderate |
| Fault Isolation | Difficult (Whole bus dies) | Excellent (Only 1 PC dies) | Difficult | Best (Many backup paths) | Good |
| Scalability | Poor (Adding PCs slows bus) | Excellent (Plug into switch) | Poor | Very Difficult | Excellent |
| Best Practical Fit | Small temporary setups | Office LANs, College labs | Legacy token rings | Military, critical banks | Multi-story campuses |
💡 DAVV Exam Tip
Question (5 Marks): “What factors should an engineer consider when selecting a network topology?”
- Name the 5 factors: Cost, Cable Length, Reliability, Scalability, and Ease of Maintenance.
- Recommend Star Topology for standard office/college labs and explain why (easy troubleshooting and isolated PC failure).