OCR GCSE Computer Science Complete Practice Exam 2025

The switch is primarily used to connect devices within a Local Area Network (LAN) because it operates at the data link layer of the OSI model, managing and directing data packets between networked devices efficiently. Unlike a hub, which broadcasts data to all connected devices without filtering, a switch learns the MAC addresses of devices on the network and sends data specifically to the intended recipient, thus optimizing network performance and reducing congestion.

Switches also offer enhanced security features compared to other devices, as they create separate collision domains for each connected device, improving overall network efficiency. This capability makes switches essential in modern networks, where multiple devices like computers, printers, and servers need to communicate effectively.

In contrast, while routers connect different networks and modems provide internet connectivity by translating signals, these are not solely focused on managing connections within a LAN, which is the primary function of a switch. Hubs, while once common, have largely been replaced by switches due to their less efficient method of handling data traffic.