1.3.3a Characteristics of networks and the importance of protocols and standards
1.3.3b Internet structure: -The TCP/IP Stack -DNS -Protocol layering -LANs and WANs -Packet and circuit switching
1.3.3c Network security and threats, use of firewalls, proxies and encryption
1.3.3d Network hardware
1.3.3e Client-server and Peer to Peer