Networks & security · Both
Networks & the Internet
Networks connect devices to share data and resources. The internet is a global network of networks.
Types and hardware
• **LAN** – local (site); **WAN** – wide area
• Hardware: NIC, switch, router, wireless access point
• Topologies (e.g. star) affect performance and resilience
• Client–server vs peer-to-peer models
Internet basics
• **IP addressing** identifies devices
• **DNS** translates domain names to IP addresses
• **Protocols** (rules): TCP/IP, HTTP/HTTPS, etc.
• Packets carry data across networks
Practice questions
1. LAN vs WAN?
2. What does DNS do?