Which type of network connects devices through signals such as infrared?

The type of network that connects devices through signals such as infrared is known as a Wireless Personal Area Network (WPAN). WPANs are designed for short-range communication between devices, typically within a few meters. They enable connectivity primarily for personal devices, such as smartphones, tablets, and peripherals like keyboards and mice. Infrared technology falls under this category as it is commonly used in personal area networking for transmitting data over short distances.

In contrast, Wireless Local Area Networks (WLAN) usually involve broader connectivity, such as connecting multiple devices in a larger area (like homes or offices) via radio waves rather than infrared. Wide Area Networks (WAN) cover a significant geographical area and connect multiple LANs, typically involving various transmission methods over longer distances. Bluetooth, while also capable of short-range communication, is a specific technology that falls under the umbrella of WPANs rather than being a separate type of network. Thus, WPAN is the most accurate classification for networks that utilize infrared signals.