Final answer:
The central device in a LAN is typically a switch, which connects multiple devices and manages network traffic efficiently.
Step-by-step explanation:
The key device at the center of a Local Area Network (LAN) is typically a switch. While both a hub and a switch can serve a similar function in connecting multiple devices on a LAN, a switch is more advanced; it sends data only to the device that needs it, rather than broadcasting the data to all connected devices as a hub would. This makes a switch a more efficient choice for network management. A router is used for connecting multiple networks together and a modem is used for connecting to an internet service provider. So the correct answer is D) Switch.
The key device at the center of a LAN is a Switch. A switch is a networking device that connects devices within a local area network (LAN) and forwards data packets between them. Unlike a hub, a switch can analyze the destination address of incoming data packets and intelligently direct them to the appropriate device, improving network efficiency.