Switches are the correct answer because at the infrastructure layer, which corresponds to the Data Link layer of the OSI model (Layer 2), switches use MAC addresses to forward data to the correct destination within a local network segment. Hubs are less intelligent devices that simply broadcast incoming packets to all ports. Routers operate at a higher layer (Layer 3 – the Network layer) and use IP addresses to route packets between networks. Firewalls can operate at various layers but are primarily used for security purposes to block or allow traffic based on a set of rules. Access points connect wireless clients to a wired network but do not primarily forward data based on MAC addresses. Repeaters simply amplify the signal to extend the network without any data forwarding decisions.