What network device is best to replace an older hub that causes excessive network collisions?

A switch is the optimal choice to replace an older hub that is causing excessive network collisions. Hubs operate using a method called broadcasting, which sends data packets to all devices on the network, leading to potential collisions, especially in busy networks. When multiple devices attempt to send data simultaneously, collisions can occur, resulting in delays and inefficiencies.

In contrast, a switch operates more intelligently. It uses MAC addresses to send data directly to the intended device rather than broadcasting it to all devices. This targeted approach significantly reduces the likelihood of collisions because data packets are only sent where needed, allowing simultaneous data transfers without interference. Therefore, using a switch enhances network efficiency, increases speed, and creates a more reliable network environment.

Other options, such as routers or bridges, serve different roles; routers are designed for connecting different networks and managing traffic between them, while bridges connect two or more segments of the same network. Repeaters amplify signals to extend the range of a network but do not address the issue of devices communicating directly, as a switch would. Thus, replacing a hub with a switch effectively resolves the problem of network collisions and enhances overall performance.