In local area networking (LAN), computers can be interconnected wirelessly using radio (Wi-Fi) or infrared links. What is this class of LAN called?

Introduction / Context:
Wireless local area networks eliminate copper or fiber runs between nodes by using radio frequency or, less commonly, infrared light to carry the frames that would otherwise travel over Ethernet cables. This question checks recognition of the proper umbrella term for such cable-free LAN interconnections.

Given Data / Assumptions:

• Scope is a local area network (LAN).
• Mediums mentioned are radio (Wi-Fi) and infrared.
• We are identifying the class/name of such LANs.

Concept / Approach:
A LAN that uses radio or infrared as the physical medium for data transmission is categorized as a “wireless LAN” (WLAN). Standards include IEEE 802.11 families for radio; historical IR LANs also existed though are rare today.

Step-by-Step Solution:
Recognize that radio/infrared replace copper/fiber.Map that to the common LAN category using air as the medium.The accepted term is Wireless LANs (WLANs).

Verification / Alternative check:
IEEE 802.11 is explicitly titled “Wireless LAN.” Infrared LANs were standardized in earlier IEEE work and various proprietary systems, all under the WLAN umbrella.

Why Other Options Are Wrong:
Network topologies: Describes structural layouts (bus, star, mesh), not the medium.

Multiplexer: A device/function for combining signals, not a LAN type.

Modem: Modulator–demodulator, not a LAN classification.

Infrared bus: Not a standard LAN category term.

Common Pitfalls:
Confusing media (wireless) with topology (star/mesh). A WLAN can still use a star topology via an access point.

Final Answer:
Wireless LANs