What causes problems?
Analysis of Internet “outages”
- Maintenance (16.2%)
- Loss of power (16%)
- Fiber cuts (15.3%)
- Hardware failure (9%)
- Routing error (6.1%)
- Congestion (4.6%)
- Malicious attack (1.5%)
- Software bug (1.3%)
Courtesy:Internet Performance Measurement and Analysis Project University of Michigan