OSI - Ref: OSI by Uyless Black, Prentice-Hall, 1991
Network layer
- Routing packets from source to destination (static tables, start of session or highly dynamically - for each packet)
- Control of congestion
- Accounting information (refer to subnet in figure 1-16)
Transport layer
- Designed to keep the user isolated from some of the physical and functional aspects of the network. (Remember: hardware changes rapidly)
- Accept data from session layer, split into smaller units and pass to network layer.
- For high throughput transport layer may create multiple network connections - dividing data to each network conn.
- Cost: May multiplex several transport conns. to same network conn.
- What service to provide to upper layers (starting with session layer)
Reference Models/OSI layers