Which network device has replaced hubs in most networks due to increased efficiency?

The switch has replaced hubs in most networks due to its ability to significantly increase efficiency and performance. Unlike hubs, which broadcast incoming data packets to all ports regardless of the intended recipient, a switch intelligently forwards data only to the specific device for which it is intended. This selective forwarding helps to reduce network congestion and allows multiple conversations to occur simultaneously on the network, effectively doubling the bandwidth available for each connection.

This efficiency is particularly important in environments with multiple devices or high data traffic, as it minimizes collisions and maximizes the utilization of network resources. The functionality of switches enhances both security and speed in a network, making them a critical component in modern networking setups.

In contrast, other devices like routers, bridges, or modems serve different primary functions: routers connect different networks and direct traffic between them, bridges filter traffic between segments of the same network, and modems facilitate communication over telephone lines or broadband connections. Each of these devices plays a unique role, but for the specific task of improving local area network efficiency, switches are the preferred choice.