Final answer:
The best choice for wireless connectivity for at least 20 guests in a conference room is an Access Point, as it allows multiple devices to connect to the network wirelessly and efficiently.
Step-by-step explanation:
The best network device to allow at least 20 guests to wirelessly connect laptop computers to the company network in a conference room is an Access Point (AP). An Access Point is designed specifically to facilitate wireless connections for multiple devices. Using radio frequency waves, usually in the 2.4 GHz to 5.0 GHz range, an access point communicates with devices like laptops and smartphones, allowing them to connect to the wider network without the need for physical cables.
A router is typically used to connect multiple networks and direct network traffic, but on its own does not necessarily provide sufficient wireless connectivity for many users. A switch is used to connect various network devices within the same network by using wired connections, and a hub is a basic network device that connects multiple computers together but does not differentiate between them or manage traffic efficiently.
Therefore, for wireless connectivity, an Access Point is the best choice as it serves as the interface between the wired network and wireless clients, and is built to handle numerous connections simultaneously, making it ideal for settings such as a conference room.