Overview
This lecture introduces network types, explains how devices connect in Local and Wide Area Networks, and compares wired and wireless networking technologies, including Bluetooth and NFC.
Introduction to Networks
- Networks connect computer systems to enable communication and resource sharing within an office or around the world.
- Local Area Networks (LANs) connect devices in the same building, such as offices or homes.
Local and Wide Area Networks
- LANs allow computers, servers, and printers in one location to communicate.
- Wide Area Networks (WANs) connect multiple LANs over different locations and provide internet connectivity.
- Connecting a LAN to a WAN enables global communications via the internet.
Wired Network Connections
- Wired networks use ethernet cables plugged into network jacks for device connectivity.
- Ethernet cables commonly use RJ-45 connectors, which have eight copper pins and wires.
- RJ-11 connectors, with six pins, are typically used for traditional landline telephones.
- Wired networks offer high speed but require physical cables between devices.
Wireless Network Technologies
- WiFi provides wireless LAN connectivity for devices like smartphones and laptops within a building.
- Wireless connections are more convenient for mobility but may not match the speed of wired connections.
Personal and Short-Range Networks
- Bluetooth creates Personal Area Networks (PANs) for connecting peripherals (e.g., headsets) within about 10 meters.
- Near Field Communication (NFC) enables very short-range wireless connections, commonly used for payments and access control.
- Bluetooth and NFC are not general-purpose network types for many computers.
Key Terms & Definitions
- LAN (Local Area Network) — Connects devices in a single physical location.
- WAN (Wide Area Network) — Links LANs over broader geographical areas and provides internet access.
- Ethernet Cable/RJ-45 Connector — Standard cable and connector type for wired network connections; RJ-45 has 8 pins.
- RJ-11 Connector — Smaller, 6-pin connector used for telephones.
- WiFi — Wireless technology for LANs.
- Bluetooth — Short-range wireless technology for personal area networks.
- PAN (Personal Area Network) — Network for personal device connectivity, usually via Bluetooth.
- NFC (Near Field Communication) — Technology for close-proximity, wireless communication.
Action Items / Next Steps
- Review differences between LAN, WAN, PAN, and wireless technologies.
- Be able to identify RJ-45 and RJ-11 connectors by function and appearance.