**802.1x** - A standard that defines a framework for centralized port-based authentication.

**802.11a** - An 802.11 standard that operates in the **5 GHz** frequency band and, by using OFDM, supports speeds** up to 54 Mbps**.

**802.11b** - An 802.11 standard that operates in the **2.4 GHz** frequency band at speeds up to **11 Mbps**.

**802.11e** - An IEEE standard created to **provide QoS** for packets when they traverse a wireless segment.

**802.11f** - An 802.11 amendment that addressed problems introduced when wireless clients roam from one AP to another, which means the station needs to re-authenticate with the new AP, which in some cases introduced a delay that would break the application connection. This amendment **improves the sharing of authentication information between APs.
**
802.11g -  An 802.11 standard that operates in the 2.4 GHz frequency band at speeds up to 54 Mbps by using OFDM.

**802.11n** - An 802.11 standard that uses several new concepts to achieve up to 650 Mbps. It does this by using channels that are 40 MHz wide, using multiple antennas, which allow for up to four spatial streams at time (using a feature called Multiple Input Multiple Output [MTMO]). Tt can be used in **both the 2.4 GHz and 5.0 GHz bands**.

**802.11ac** - An 802.11 standard that builds on concepts introduced with 802.11n. Although it operates only in the **5.0 GHz** frequency, it **increases the channel width from 40 MHz to 80 MHz.**