Which device is commonly used to connect multiple switches together in a network?

In networking, the device that is commonly used to connect multiple switches together is indeed a router. A router manages traffic between different networks and can connect multiple switches that may be on different local area networks (LANs). It is essential for routing data packets between switches, enabling communication within and between networks.

Switches operate primarily at the data link layer and are responsible for forwarding data within the same network. When switches need to communicate with devices on different networks, the router serves as a gateway, directing packet traffic. It also performs additional functions such as network address translation (NAT) and firewall capabilities.

Other devices listed have different primary functions. For instance, firewalls are mainly used to monitor and control incoming and outgoing network traffic based on predetermined security rules, while hubs serve as simple networking devices used for connecting multiple Ethernet devices; they do not manage traffic intelligently like switches or routers. Access points are used to connect Wi-Fi devices to a wired network, but they don't serve the function of connecting multiple switches together in a network topology.