Learning objectives
Describe the purpose and characteristics of LANs, WANs, PANs and VPNs, and choose a network type for a described situation
Describe the purpose, benefits and limitations of the internet, cloud computing, distributed systems, edge computing and mobile networks, using examples such as the web, cryptocurrency blockchains, smart traffic control and a school network
Describe what gateways, hardware firewalls, modems, network interface cards, routers, switches and wireless access points each do in a network, and identify the layer of the TCP/IP model at which each device works
Describe the transport protocols TCP and UDP and the application protocols HTTP, HTTPS and DHCP, and justify whether TCP or UDP suits an application such as file download, video calling or online gaming
(HL) Explain how the application, transport, internet and network interface layers of the TCP/IP model cooperate to deliver data reliably, including encapsulation, and identify the layer at which each protocol works
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