The 2.4-GHz frequency band is globally used for WLANs. Both were initially developed by the U.S. military because both spread spectrum consume more bandwidth than narrowband transmission, enabling a louder signal that is easier to receive than a narrow band and make it hard for a third-party to intercept or jam. 802.3 Ethernet has become the predominant wired LAN technology, the IEEE 802.11 standard has emerged in the realm of WLANs. Both 802 and 802.11 standard focuses on the bottom two levels of the ISO model, the physical layer and data link layer. Spread Spectrum Higher frequency and much greater range characteristics.
Frequency hops from one to another continuously during the allowable delivery range.
The level that the frequency hops on must be know to the receiver so that the data message may be delivered in that level. There are three links that complete the basis of the wireless infrastructure. They provide the interface between the network system and an antenna, to create a transparent connection to the network. Access Points are equivalent to its LAN hub cousin. The wireless LAN also receives, buffers, transmits data between the WLAN and the wired network, supporting a group of wireless user devices.