How to distinguish a switch from a router and what are their main functions?

A switch and a router are network devices with different functions and principles of operation.

Switch:

• Operates at the data link layer (layer 2 of the OSI model).
• Connects devices within a local area network (LAN).
• Forwards data based on MAC addresses, directing frames only to the intended port.
• Main task is efficient traffic distribution within the network.

Router:

• Operates at the network layer (layer 3 of the OSI model).
• Connects different networks (e.g., LAN to the Internet).
• Uses IP addresses to determine the route for packet forwarding.
• Performs routing, traffic management, and can provide security functions (e.g., NAT, firewall).

Example: In an office, a switch connects computers within the building, while a router connects the office to the Internet and manages data transfer between networks.