Internetworking connects different networks that may use different technologies.
Challenging because:
- Different protocols
- Different addressing schemes
- Different packet sizes
- Security differences
- QoS differences
Interconnection Methods
Networks can be interconnected at different OSI layers.
| Layer | Device |
|---|---|
| Physical | Repeaters, hubs |
| Data Link | Bridges, switches |
| Network | Routers |
| Transport | Transport gateways |
| Application | Application gateways |