802.11b, also referred to as 802.11 High Rate or Wi-Fi, is an extension to IEEE 802.11 that applies to wireless LANS and provides 11 Mbps transmission (with a fallback to 5.5, 2 and 1 Mbps) in the 2.4 GHz band. 802.11b uses only DSSS. 802.11b was a ratification to the original 802.11 standard, allowing wireless functionality comparable to Ethernet.
802.11e
802.11e, an IEEE standard, is the quality-of-service specification over a LAN, in particular, the 802.11 WiFi standard. The standard is considered of critical importance for delay-sensitive applications, such as Voice-over-Wireless IP and Streaming Multimedia. The protocol enhances the IEEE 802.11 Media Access Control (MAC) layer.
802.11g
802.11g is an extension to IEEE 802.11 which offers wireless transmission over relatively short distances at 20 ¨C 54 Mbps in the 2.4 GHz band. The 802.11g also uses the orthogonal frequency division multiplexing (OFDM) encoding scheme. 802.11g is compatible with older 802.11b.
802.11i
802.11i, also called Wi-Fi Protected Access 2 (WPA 2), is the standard for WLAN security. WPA 2 supports the 128-bit-and-above Advanced Encryption Standard, along with 802.1x authentication and key management features. It also uses TKIP (Temporal Kye Integrity Protocol) which rotates key periodically to improve WLAN security.
802.11j
802.11j is the IEEE standard to the 802.11 family of standards for wireless local area networks (WLANs) for 4.9 GHz - 5 GHz frequency use of WLAN systems in Japan.
802.11k
The 802.11k is the Radio Resource Management standard to provide measurement information for access points and switches to make wireless LANs run more efficiently. It may, for example, better distribute traffic loads across access points or allow dynamic adjustments of transmission power to minimize interference.
802.11n
802.11n is the IEEE Standard for WLAN enhancements for higher throughput designed to raise effective WLAN throughput to more than 100Mbit/sec. and to cover a range up to 400 meters. IEEE 802.11n technology is also known as Multiple Input, Multiple Output (MIMO).
802.11r
The 802.11r is the Fast Roaming standard to address maintaining connectivity as a user moves from one access point to another. This is especially important in applications that need low latency and high quality-of-service.
802.11s
802.11s standard is designed to deal with mesh networking in wireless communication. It is predicted to be ratified in mid-2008.
802.11x
802.11x refers to a group of evolving wireless local area network (WLAN) standards that are elements of the IEEE 802.11 family of specifications. 802.11x should not be mistaken for any one of its elements because there is no single 802.11x standard. The 802.11 family currently includes six over-the-air modulation techniques that all use the same protocol. The most popular (and prolific) techniques are those defined by the b, a, and g amendments to the original standard; security was originally included and was later enhanced via the 802.11i amendment. 802.11n is another new modulation technique. Other standards in the family (c¨Cf, h, j) are service enhancements and extensions or corrections to previous specifications. 802.11b was the first widely accepted wireless networking standard, followed by 802.11a and 802.11g.
Explanation : A feature of VoIP systems where the originating device attempts to find an alternative call endpoint when a connection cannot be established to the intended endpoint. In order for dial-peer hunting to work the originating device must have a list of dial peers (all can route a call to the same endpoint, but use different destination routers) so the originating device can proceed to the next in the dial peer sequence.
