Which of the following devices is commonly used to connect multiple devices on a local area network (LAN)?

The device that is commonly used to connect multiple devices on a local area network (LAN) is a hub. A hub operates at the physical layer of the OSI model and serves as a basic networking device that allows multiple Ethernet devices to connect and communicate within the same network segment.

When devices are connected to a hub, any data sent from one device is broadcast to all other devices connected to that hub. While this means that all devices receive the same data, only the intended recipient processes the data, while the others ignore it. Hubs are simple and relatively inexpensive, making them suitable for small networks.

In contrast, a router connects different networks, such as a local network to the internet, and routes data between them based on IP addresses. A modem connects a network to the internet service provider, and an access point allows wireless devices to connect to a wired network. While each of these devices plays an important role in networking, the hub's primary function is focused on connecting multiple devices within a single local area network, making it the correct choice for this question.