Intra controller roaming
When the wireless client moves its association from one access point to another, the controller simply updates the client database […]
BLOCK ACK
Block Acknowledgment In the 802.11 MAC as it was originally specified in 1997, every frame required a positive acknowledgment. Each […]
Frame Changes 802.11n
The 802.11 data frame is only slightly changed by 802.11n. Figure 5-1 shows the format of an 802.11 Data frame […]
802.11 PHY Layer – Carrier Sense/Clear Channel Assessment (CS/CCA)
Carrier Sense/Clear Channel Assessment (CS/CCA) If the station is not currently transmitting or receiving, it listens and senses the channel […]
802.11 MAC Sublayer format
General 802.11 MPDU Format The technical term for an 802.11 frame is an 802.11 MAC Protocol Data Unit (MPDU) MAC […]
802.11 – Step Back Review
Direct sequence spread spectrum (DSSS) PHY specification for the 2.4 GHz band designated for ISM applications The DSSS system provides […]
802.11 Association Status Codes & Codes
802.11 Association Status Codes Code 802.11 definition Explanation 0 Successful 1 Unspecified failure For example : when there is no […]
802.11 Data Types and Wireshark filters
Type value Type description Subtype value Subtype description Wireshark display filter 00 Management 0000 Association Request wlan.fc.type_subtype == 0x00 00 […]
802.11 Frames
Management Frames 802.11 management frames make up a majority of the frame types in a WLAN. Management frames are used […]
OSI model – 802.11
Data-Link Layer The 802.11 Data-Link layer is divided into two sublayers: The upper portion is the IEEE 802.2 Logical Link […]