7822611
Beschreibung
Karteikarten von Amit Pindoria, aktualisiert more than 1 year ago
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Erstellt von Amit Pindoria
vor fast 8 Jahre
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| Frage | Antworten |
| 3 Phyiscal (PHY) layer specfications for 802.11 | 1) Infrared 2) FHSS 3) DSSS |
| 802.11 radios PHY that can transmit in channels subdivided from the entire 2.4 GHz | DSSS |
| Radios, which are permitted to transmit on 1 MHz subcarriers in the 2.4 | FHSS |
| 1 Mbps and 2 Mbps data rates were part of the ______ 802.11 standard | Original |
| 802.11b is also known as | High-Rate DSSS (HR-DSSS) |
| Uses CCK (Complementary Code Keying) | 802.11b |
| Data rates of 1, 2, 5.5, and 11 Mbps | 802.11 - 1, 2 Mbps HR-DSSS: 802.11b - 5.5, 11Mbps |
| Uses 3 different 100 MHz unlicensed frequency | 5Ghz |
| Data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbps | 5Ghz (OFDM) |
| Technology called Extended Rate Physical (ERP) | 802.11g |
| Two mandatory PHYs are: ERP-OFDM and ERP-DSSS/CCK | 802.11g |
| Two optional PHYs are: ERP-PBCC and DSSS-OFDM | 802.11g |
| Country code information is delivered in beacons and probe responses | 802.11d |
| Defines mechanisms for dynamic frequency selection (DFS) and transmit power control (TPC) | 802.11h |
| 5.150 GHz–5.250 GHz | U-NII-1 (lower) 4 channels |
| 5.250 GHz–5.350 GHz | U-NII-2 (middle) 4 channels |
| 5.47 GHz–5.725 GHz | U-NII-2 Extended 802.11h 11 channels |
| 5.725 GHz–5.825 GHz | U-NII-3 (upper) 4 channels |
| Major security enhancements in Wireless Standard | 802.11i |
| Data privacy using RC-4 ciphers | TKIP |
| Data privacy using AES encryption | CCMP (Cipher Block Chaining Message Authentication Code Protocol) |
| Defines the entire method for authentication, generating encryption keys for clients and APs | Robust Security Network (RSN) |
| Japanese 4.9 GHz and 5 GHz bands | 802.11j |
| Wireless Standard for QoS | 802.11e |
| Contention-based method determining who gets to transmit on the wireless medium next | Distributed Coordination Function (DCF) |
| Access point briefly takes control of the medium and polls the clients | Point Coordination Function (PCF) |
| Has 2 access mechanisms to provide QoS | Hybrid Coordination Function (HCF) |
| - extension to DCF - provide for the “prioritization of frames” based on upper-layer protocols | Enhanced Distributed Channel Access (EDCA) |
| - Extension of PCF - Gives the access point the ability to provide for “prioritization of stations.” - Like PCF never adopted by WLAN vendors | Hybrid Coordination Function Controlled Channel Access (HCCA) |
| WMM | Wireless Multi Media |
| Fast basic service set transition (FT) | 802.11r |
| Radio Resource Management (RRM) | 802.11k |
| 802.11k: 802.11h defined this for 5GHz frequency | Transmit Power Control (TPC) |
| 802.11k: These client statistics are reported back to the AP for RRM | - Signal-to-Noise (SNR) - Signal strength (RSSI) - Data rates |
| Noise floor information and Channel load information is reported back to the access point | 802.11k - RRM |
| Learn details about other access points that the client might want to roam to from the access point or the WLAN Controller | Neighbour reports |
| Robust management frames Designed to prevent DOS attacks against management frames | 802.11w |
| Broadcast and multicast frames are protected using the Broadcast/Multicast Integrity Protocol (BIP) | 802.11w |
| Known as Wireless Access in Vehicular Environments (WAVE) | 802.11p |
| Allows client stations to bypass the access point and communicate with direct frame exchanges | 802.11z Direct Link Setup (DLS) |
| Wi-Fi Alliance’s Hotspot 2.0 specification and its Passpoint certification This standard and certification is designed to provide seamless roaming for wireless devices between your Wi-Fi network and other partner networks, similar to how cellular telephone networks provide roaming | 802.11u |
| Provides for an exchange of information that can potentially ease the configuration of client stations wirelessly from a central point of management | 802.11v Defines Wireless Network Management (WNM) |
| Standardizing mesh networking using the IEEE 802.11 MAC/PHY layers | 802.11s |
| QoS enhancements to the 802.11 Media Access Control (MAC) for robust audio and video streaming for both consumer and enterprise applications | 802.11ae |
| Very High Throughput (VHT) at 60Ghz at up to 7 Gbps | 802.11ad |
| 256-QAM modulation | 802.11ac |
| Null data packet (NDP) | Used in 802.11ac beamforming |
| Use of wireless in the newly opened TV white space (TVWS) frequencies between 54 MHz and 790 MHz | 802.11af |
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