Circuit switching establishes a dedicated physical path between nodes for the duration of a call, packet switching breaks messages into packets that are routed independently over multiple paths, and message switching stores and forwards complete messages without maintaining end-to-end connections.

1. Switching
• Circuit Switching
• Packet Switching
• Message Switching

2. Switched Network

4. Circuit-Switched Network

5. Switch

7. Crossbar Switch

8. Multistage Switch

9. Switching Path

11. Datagram Approach

12. Figure 14-15
Datagram Approach, Multiple Channels

13. Switched Virtual Circuit

14. Switched Virtual Circuit

15. Message Switching