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| Frage | Antworten |
| Active Mode | Power management of a station. Always in an awake state. |
| Adjacent Overlapping Channel | Channels that are directly next to each other and overlapping. |
| Adjacent Non-overlaping Channel | Channels that are not overlapping such as 1, 6, and 11 |
| Adjacent Channel Interference | When two or more radios are providing RF coverage to the same physical area on overlapping frequencies |
| A-MSDU | Contains multiple MSDUs, transported in a single MSDU or multiple MSDUs. |
| A-MPDU | Contains multiple MPDUs, transported as a single PSDU by the PHY |
| Announcement Traffic Indication Message (ATIM) | Frame sent between peers in an Ad Hoc network indicating that data is awaiting delivery to the station that receives the ATIM frame |
| Autonomous Access Point | Access point containing full MAC layer processing locally on the AP. Also known as "fat" or "thick" APs. Required individual management. |
| Channel Stacking / Channel Spanning / Channel Blankets | Used in Single Channel Architectures with WLANs being co-located in the same physical area on different 802.11 channels. |
| Co-channel Interference | Occurs when two access point radios are providing RF coverage to the same physical area using the same channel. |
| Controller-based access point | Access point part of a controller system. Also called "Split MAC" architecture. WLAN controllers communicate with controller-based APs (also called lightweight or thin). Controller does most of the intelligence in architecture. |
| DSSS | Direct Sequence Spread Spectrum Clause 15. Specified in 802.11-1999. Uses 1 and 2 Mbps data rates. Supported by 802.11b and 802.11g |
| DSSS-OFDM | Optional ERP modulation. Specified in 802.11g amendment. Combines DSSS preamble and header with an OFDM payload transmission. Data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbps |
| Dynamic Rate Switching (DRS) | Used in 802.11g Stations can change their data rate as they move toward or away from an AP to maintain high quality connection |
| Enterprise Encryption Gateway (EEG) | L2 encryption device Strong authentication and encryption |
| ERP | Extended Rate Physical (clause 19) Rate extension of the PHY for DSSS of Clause 15 and Clause 18 (HR/DSSS) |
| ERP-DSSS | Required ERP modulation specified by 802.11g amendment. Has exceptions: Support of short PLCP PPDU header CCA Max input signal level is -20 dBm Locking transmit center frequency and symbol clock frequency to the same reference oscillator is mandatory |
| ERP-OFDM | Required ERP modulation specified by 802.11g amendment Exceptions: Frequency plan in accordance with 18.4.6.1 and 18.4.6.2 CCA Frequency accuracy is +/- 25 PPM Max input signal level is -20 dBm Slot time is 20 microseconds SIFS time is 10 microseconds |
| ERP-PBCC | Optional ERP modulation in 802.11g Single carrier modulation |
| Fast BSS Transition (FT) / Fast Secure Roaming (FSR) | Fast, secure handoffs between APs within an ESS. Uses Robust Security Network features Roams using 4-Way handshake (802.11i) or over-the-air / over-the-DS exchanges (802.11r FT) |
| High Throughput | Represents 802.11 Clause 20 PHY MIMO is used |
| HR/DSSS definition, data rates, supported by... | High Rate Direct Sequence Spread Spectrum Introduced 5.5 and 11 Mbps data rates Backwards compatible with DSSS First supported by 802.11b Supported by 802.11g |
| IEEE 802.3-2005 Clause 33 PoE | Refers to Power over Ethernet 802.3af DC power over Category 5 or greater |
| IEEE 802.11 standard | 802.11-2007 |
| Information Element | Are flexible data structures within 802.11 management frames |
| Information Field | Fixed-length, mandatory component in 802.11 management frames |
| MMPDU | Medium Access Control (MAC) Management Protocol Data Unit Unit of data exchanged between two peer MAC entities using services of the PHY |
| MPDU | Medium Access Control (MAC) Protocol Data Unit Exchanged between two peer MAC entities using the services of the PHY. Comprised of MSDU, MAC header, and a trailer |
| MSDU | Medium Access Control (MAC) Service Data Unit Data presented to MAC service access point by upper layer protocols Can be comprised of data from LLC sublayer and/or any number of layers above the Data Link layer |
| MCA | Multiple Channel Architecture Three or more channels used |
| Non-ERP | Non Extended Rate Physical (clauses 15 and 18) Stations not ERP STAs but can interoperate with ERP STAs, specifically DSSS and HR/DSSS |
| Octet | Describes 8 bits of data |
| OFDM, amendment use, frequency, and data rates | Orthogonal Frequency Division Multiplexing Introduced with IEEE 802.11a Used in 5 GHz 6, 9, 12, 18, 24, 36, 48, and 54 Mbps Mandatory of 6, 12, and 24 Mbps Not backwards compatible with HR/DSSS or DSSS |
| Power Save (PS) mode | Power management of a station Operates in active mode or power-save mode STA in power-save mode is in awake or doze state Also known as Power Save Poll (PSP) |
| Robust Security Network (RSN) | Network that allows only robust security network associations (RSNAs) Can be identified in RSN Information Element of beacon frames |
| Single Channel Architecture (SCA) | All APs deployed on one channel in 2.4 GHz or 5 GHz Transmissions coordinated by a WLAN controller on single 802.11 channel |
| Unlicensed National Information Infrastructure (UNII) Bands | 5.15 - 5.25 Lower UNII-1 5.25 - 5.35 Middle UNII-2 5.470 - 5.725 GHz Extended UNII-2E 5.725 - 5.825 GHz Upper UNII-3 |
| Lower UNII-1 | 5.15 - 5.25 GHz |
| Middle UNII-2 | 5.25 - 5.35 GHz |
| UNII-2 Extended | 5.470 - 5.725 GHz |
| Upper UNII-3 | 5.725 - 5.825 GHz |
| Virtual BSSID / Virtual Cell | When 2 or more access points coordinated by a WLAN controller appear to be the same access point and have the same BSSID |
| VoWiFi / VoWi-Fi / wVoIP / VoWLAN / VoFi | Refers to transmitting voice over Internet Protocol over an 802.11 data link |
| Wi-Fi Alliance | Formally known as Wireless Ethernet Compatibility Alliance (WECA) Nonprofit formed in 1999 Certifies interoperability of WLAN products based on IEEE 802.11 standard and amendments |
| Wi-Fi Multimedia (WMM), amendment | Created by Wi-Fi Alliance for support of multimedia applications with QoS Started with 802.11e |
| WMM Access Categories | Voice Video Best effort Background |
| WNMS | Wireless Network Management System Monitoring, configuring, and updating autonomous access points or WLAN controllers w/ controller-based access points |
| WLAN Controller | Also known as a WLAN switch Communicate with lightweight or thin access points Often called Split MAC architecture |
| WLAN Profile | Group of settings within an 802.11 WLAN controller that has parameters for a client to connect to the network infrastructure |
| WMM-PS or U-APSD | IEEE 802.11e amendment Automatic Power Save Delivery (APSD) |
| WPA-Enterprise and WPA2-Enterprise, amendment | Leverages IEEE 802.1X Uses EAP 802.11i amendment |
| WPA-Personal - and WPA2-Personal | Designed for SOHO Uses PSK instead of 802.1X/EAP |
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