1 / 27

Wireless Networking IEEE 802.11 Standards Module-03B

Wireless Networking IEEE 802.11 Standards Module-03B. Jerry Bernardini Community College of Rhode Island . Presentation Reference Material. CWNA Certified Wireless Network Administration Official Study Guide (PWO-104), David Coleman, David Westcott, 2009, Chapter-5

ardelle
Download Presentation

Wireless Networking IEEE 802.11 Standards Module-03B

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Wireless NetworkingIEEE 802.11 StandardsModule-03B Jerry Bernardini Community College of Rhode Island Wireless Networking J. Bernardini

  2. Presentation Reference Material • CWNA Certified Wireless Network Administration Official Study Guide (PWO-104), David Coleman, David Westcott, 2009, Chapter-5 • http://www.ieee802.org/11/ • http://en.wikipedia.org/wiki/IEEE_802.11 Wireless Networking J. Bernardini

  3. Wireless Networking J. Bernardini

  4. IEEE 802.11 Standards • Institute of Electrical and Electronic Engineers (IEEE) a professional society activity to establish standards • Hierarchical documents using clauses and sub-clauses • Task Groups (TGb, TGa, …) are used to study topics • Other Task Groups include: Ethernet, 802.3, 802.5, 802.15 • Task Groups designated by letters; a, b, g, n … • Defines wireless technology at Physical (PHY) and MAC sub- layer of Data link layer • Upper layer not addressed except of QoS Wireless Networking J. Bernardini

  5. 802.11-1997 (802.11 legacy) • Original version of the standard IEEE 802.11, released in June1997 and clarified in 1999 • ISM 2.4 GHz. band • Forward correcting codes code. • Infrared operating at 1 Mbps • Frequency Hopping Spread Spectrum (FHSS); at 1, 2 Mbps • Direct Sequence Spread Spectrum (DSSS); at 1, 2 Mbps • Legacy 802.11 with direct-sequence spread spectrum was rapidly supplanted and popularized by 802.11b. • Standard revised in 1999, 2003, 2007 Wireless Networking J. Bernardini

  6. IEEE 802.11 b • Defined as High-Rate DSS (HR-DSS) and Clause 18 devices • Uses 2.4 GHz ISM band • Support data rates of 1, 2, 5.5, 11 Mbps • Phase modulation and encoding spread spectrum • Complementary Code Keying (CCK) and Barker Coding • Manufacture dependent backward compatibility • Interference from other products operating in the 2.4 GHz band; microwave ovens, Bluetooth devices, baby monitors and cordless telephones Wireless Networking J. Bernardini

  7. IEEE 802.11 a • IEEE standard in 1999 (same year as 802.11b) • Uses UNII 5 GHz band – less crowded that 2.4 GHz band • Updated in Clause 17 802.11-2007 • Orthogonal Frequency Division Multiplexing (OFDM) used instead of DSSS • Supports 6, 9,12, 18, 24, 36, 54 Mbps • Not all vendors support all rates • Not compatible with 802.11b,802.11g and legacy 802.11 • Simultaneous operation with 802.11b,802.11g • Originally not adapted because of high frequency component costs Wireless Networking J. Bernardini

  8. IEEE 802.11 g • 2003 standard (Clause 19) for 2.4 GHz band • Referred to as Extended Rate Physical (ERP) • OFDM based and the same as 802.11a • Backward compatibility with 802.11b (ERP-DSSS/CCK) • Supports 6, 9, 12, 18, 24, 36, 48, 4 Mbps • Rapidly adopted by consumers because of speed , • Dual-band 802.11a/b, dual-band/tri-mode and b/g in a single adapter card and AP are available. • Like 802.11b, 802.11g devices suffer interference from other 2.4 GHz products • Equipment must support three modes and protection mechanism: • B-only mode • G-only mode • B/G-mode Wireless Networking J. Bernardini

  9. IEEE 802.11 n • Started in 2004, final ratification October 2009 (textbook still lists as draft) • Defined as High Throughput (HT) ( Clause 20) • Major goal: increase throughput over 802.11a/b/g • Backward compatible to 802.11a/b/g • Supports speeds over 100 Mbps • Multiple-Input-Multiple-Output (MIMO) to compensate for multipath • Requires multiple antennas and dual radios for full standard • Many other newer features to be covered later • Even before final ratification WiFi Alliance certified 802.11n draft 2 • Must support multiple modes and protection mechanism: • N-only mode (Greenfield mode) • A-only mode • B/G-mode Wireless Networking J. Bernardini

  10. IEEE 802.11 d • 2001 standard International use and (country-to-country) roaming extensions • Defines differences between countries country codes , frames and beacons • Configuration parameters for FHSS (legacy use) • Details in 802.11-2007 clause 9.8 Wireless Networking J. Bernardini

  11. IEEE 802.11 F • An attempt to standardize wireless roaming • Vendors did not adapt the recommendations uniformly • Roaming will probably not work between vendor • Two things must happen for roaming • New AP must inform original AP a station is associating with the new AP and want buffered packets • Original AP must forward buffered packets to new AP • 802.11F never ratified and withdrawn in February 2006 • Light AP’s and WLAN controller minimize the need for inter-vendor roaming standard • Recommend practice is to use Inter-Access Point Protocol (IAPP) Wireless Networking J. Bernardini

  12. IEEE 802.11 h • Standard to define mechanism for Dynamic Frequency Selection (DFS) • Standard to define mechanism for Transmit Power Control (TPC) • Radar detection and WLAN control • Increased frequency space in UNII-2 band • Amendent now in 11.8 and 11.9 of 802.11-2007 Wireless Networking J. Bernardini

  13. IEEE 802.11 i • 802.11 from 1997 to 2004 only support 64-bit Wired Equivalent Privacy (WEP) encryption • WEP was cracked in 2003- no long recommended • 802.11i improves wireless security • Stronger encryption methods • Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP) and Advanced Encryption Standard (AES) • Temporal Key Integrity Protocol (TKIP) • RC-4 Stream cipher • Extensible Authentication Protocol (EAP) • WiFi Protection Access 2 (WAP2) • Wireless Security is important - CWSP Wireless Networking J. Bernardini

  14. IEEE 802.11 j • Standard to gain Japanese regulatory approval for MAC and 802.11a PHY improvements • Japan 802.11a radio cards to operate at 5.15 to 5.25 GHz and 4.9 to 5.091 GHz • Option for Japan to operate OFDM with 10 MHz spacing, increasing number of bandwidth rates Wireless Networking J. Bernardini

  15. IEEE 802.11 e • Amendment for Quality of Service (QoS) • Voice and Video are not latency and jitter tolerant • Voice over IP (VoWIP) and VoWiFi • Defines layer two MAC methods to meet QoS • Distributed Coordination Function (DCF)– random method to determine which application runs first • Point Coordination Function (PCF) –Polls clients for appilcation priority • Hybrid Coordination Function Control Channel Access (HCCA)- AP is given ability to set station priority • Wi-Fi Alliance Wi-Fi Multimedia (WMM) Wireless Networking J. Bernardini

  16. IEEE 802.11 k Wireless Networking J. Bernardini

  17. IEEE 802.11 r Wireless Networking J. Bernardini

  18. IEEE 802.11 m Wireless Networking J. Bernardini

  19. IEEE 802.11 p Wireless Networking J. Bernardini

  20. IEEE 802.11 s Wireless Networking J. Bernardini

  21. IEEE 802.11 T Wireless Networking J. Bernardini

  22. IEEE 802.11 u Wireless Networking J. Bernardini

  23. IEEE 802.11 v Wireless Networking J. Bernardini

  24. IEEE 802.11 w Wireless Networking J. Bernardini

  25. IEEE 802.11 y Wireless Networking J. Bernardini

  26. IEEE 802.11 z Wireless Networking J. Bernardini

  27. IEEE 802.11 aa Wireless Networking J. Bernardini

More Related