1. 1 3 Computing System Fundamentals 3.4 Networked Computer Systems

2. 3.4.3 Network Protocols

3. 3 WANs vs. LANs They differ in size, but also: ‣ LAN's allow networked machines to listen and broadcast freely, with switches and bridges keeping the traffic manageable, ‣ WANs however use software switching technology to direct the traffic.

4. 4 WANs vs. LANs They differ in size, but also: ‣ LAN's allow networked machines to listen and broadcast freely, with switches and bridges keeping the traffic manageable, ‣ WANs however use complex software switching technology to direct the traffic.

5. 5 Protocols A protocol is a universally standard set of rules governing how devices communicate. It must include information on: ‣ handshaking (establishing the connection), ‣ data compression methods, ‣ end of message markers, ‣ confirmation of receipt, ‣ error checking methods.

6. 6 Protocols The commonest example on the internet is TCP/IP. The decision on which to use is based on speed, security, accuracy, reliability, simplicity, etc. e.g. Skype uses UDP because it is faster than TCP/IP. Essential both devices are capable of using the same protocol (very likely these days).