Networking Devices - Routers

Hubs and Switches: Primary devices to connect computers in a Local Area Network (LAN).
- Hubs: Layer one (physical layer) devices, they transmit data packets as received without inspection.
- Switches: Layer two (data link layer) devices, they can inspect Ethernet frames to determine appropriate paths for forwarding data.
Routers: Devices utilized to send or receive data between different networks.
- Operates at Layer three (network layer) of the OSI model.
- Capable of inspecting IP data to determine forwarding paths.
- Stores internal routing tables to manage traffic between various networks worldwide.

Home and Small Office Routers:
- Commonly seen type of routers.
- Have less detailed routing tables aimed at forwarding traffic from an internal LAN to an Internet Service Provider (ISP).
Core Routers:
- Operate at the ISP level, forming the backbone of the Internet.
- Handle significantly more traffic and increased complexity compared to home routers.
- Maintain multiple connections to various routers.
- Use BGP (Border Gateway Protocol) for data sharing and to identify optimal routing paths.

Routing Process:
- When a web browser loads a webpage, the data may pass through numerous routers.
- The complexity of the Internet necessitates routers act as global guides, ensuring data reaches its destination efficiently.