Which of the following is used to connect multiple broadcast domains?

Connecting multiple broadcast domains requires the use of a device that can manage and route traffic between different networks. A router is specifically designed for this purpose. It operates at the network layer of the OSI model and can intelligently direct data packets between various IP networks, effectively allowing communication between different broadcast domains.

Broadcast domains are segments of a network where all devices can receive broadcast messages from one another. However, when the need arises to connect these separate segments and control broadcast traffic, routers step in. They can reduce unnecessary broadcasts, enhance security by isolating different parts of the network, and facilitate communication between diverse IP subnets.

In contrast, other devices like hubs and switches operate within a single broadcast domain and do not have the capability to segment broadcast domains. Hubs simply forward packets to all connected devices within the same domain, and switches (although more efficient than hubs) create a single broadcast domain for all connected devices within the same VLAN unless they are configured to partition them into multiple VLANs. Repeaters regenerate signals to extend the transmission distance but do not have any routing capability to manage broadcast domains. Thus, the router stands out as the essential device needed for interconnecting multiple broadcast domains efficiently and effectively.