Legacy IEEE 802.11 wireless local-area networks (WLANs) operate in which of the following layers of the ISO/OSI reference model? Physical and data layers Data and network link layers Transport and presentation layers Application and session layers Solution a. Physical and data layers Legacy IEEE 802.11 wireless LANs (WLANs) operate in the physical layer and the data link layer of the ISO/OSI reference model because they define the physical characteristics and access rules for the network. The physical layer addresses areas such as frequencies used and modulation techniques employed.