Circuit switching and packet switching are two methods for transferring data across networks. Circuit switching establishes a dedicated communication path between two stations by reserving bandwidth for the duration of the call. Packet switching breaks messages into packets that are transmitted independently across the network and reassembled at the destination. It allows for more efficient use of bandwidth by allowing packets from multiple messages to share transmission resources.

1. CIRCUIT SWITCHING AND PACKET SWITCHING

4. Simple Switched Network

7. Public Circuit Switched Network (eg. public telephone network)

9. Circuit Establishment

13. Space Division Switch

21. Traditional Circuit Switching

22. Softswitch

26. Use of Packets

37. X.25 Use of Virtual Circuits

39. User Data and X.25 Protocol Control Information