Physical layer - Wireless medium

Wireless is one of the three types of physical media used for the transmission of information over data networks. The Physical Layer of the OSI Model defines the methodologies used to transmit data wirelessly using electromagnetic waves.

There are various types of wireless technologies that can be used for transmission including:

• Wi-Fi - This is the major technology used in data networks that is defined by the IEEE 802.11 series of standards.
• Wi-Max - A family of wireless broadband communication standards based on the IEEE 802.16 series of standards.
• Cellular data - This includes data communications using 3G, 4G, and 5G mobile communication networks
• Microwave - A series of technologies, including terrestrial point to point as well as satellite communications leveraging the microwave range of frequencies.

Some additional information about Wi-Fi networks can be found here:

• Wireless Service Sets
• Wireless roaming defined
• Wireless Fast BSS Transition
• Wireless - virtual WLC limitations
• Wireless AP FlexConnect mode switchport mode
• Wireless - configure a 1941W router with a single subnet on wired and wireless interfaces

Links:

https://networklessons.com/cisco/ccna-200-301/introduction-to-wireless-networks