Wireless networks can provide client mobility, the ability to connect from any location and at any time, and the ability to roam while staying connected. A Wireless LAN (WLAN) is a classification of wireless network that is commonly used in homes, offices, and campus environments. Although it uses radio frequencies instead of cables, it is commonly implemented in a switched network environment and its frame format is similar to Ethernet.

This chapter covers WLAN technology, components, security, planning, implementation, and troubleshooting. The types of network attacks to which wireless networks are particularly susceptible are discussed.