Lecture 8 - wireless Part 1

Lecture 8 - wireless Part 1 - Ultimate Hacking Wireless...

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© 2010 by Foundstone - All rights reserved. Duplication of this material is expressly prohibited III-1 http://www.foundstone.com Ultimate Hacking Wireless 802.11 Wireless Fundamentals www.foundstone.com Copyright © 2010, McAfee, Inc. 802.11 Wireless Fundamentals 3-2 Overview History 802.11 Design and Terminology Deployment and Architecture www.foundstone.com Copyright © 2010, McAfee, Inc. 802.11 Wireless Fundamentals 3-3 History Initially developed in 1970 at the University of Hawaii named “ALOHANet” using ham radios About IEEE/802.11 Institute of Electrical and Electronics Engineers (IEEE) eventually developed standards for 802.11 technology in 1997 As part of the 802 LAN/WAN standards, working group 11 was added (802.11) and reserved as the family for all wireless technologies to be discussed. www.foundstone.com Copyright © 2010, McAfee, Inc. 802.11 Wireless Fundamentals 3-4 History 802.11 h We are most familiar with three 802.11 amendments: 802.11a, 802.11b, and 802.11g h 802.11 Legacy was the first implementation of the standard and was quickly revised h 802.11a and 802.11b were released together, but due to the availability of 2.4ghz chipsets 802.11b quickly took the market place www.foundstone.com Copyright © 2010, McAfee, Inc. 802.11 Wireless Fundamentals 3-5 Protocol Released Frequency Channels Modulation Throughput (Typical) Throughput (Max) Range (Indoor) Range (Outdoor) 802.11 1997 2.4-2.5 GHz 3 non- overlapping FHSS or DSSS 0.7 Mb 2 Mb ~20m ~75 m 802.11a 1999 5.15-5.25/ 5.25-5.35/ 5.725-5.875 GHz 12 non- overlapping OFDM 23 Mb 54 Mb ~30 m ~100 m 802.11b 1999 2.4-2.5 GHz 3 non- overlapping CCK 4 Mb 11 Mb ~35 m ~110 m 802.11g 2003 2.412-2.472 GHz 3 non- overlapping OFDM 19 Mb 54 Mb ~35 m ~110 m 802.11n 2009 2.4 GHz and/or 5 GHz 11 pairs at 5GHz/ 1 pair at 2.4GHz MIMO OFDM 74 Mb 248 Mb = 2x2 ant ~70 m ~160 m 802.11y 2008 3.65 - 3.7Ghz 2 non- overlapping OFDM 23 Mb 54 Mb ~50 m ~ 5000m History 802.11 Evolution and Comparison www.foundstone.com Copyright © 2010, McAfee, Inc. 802.11 Wireless Fundamentals 3-6 Design and Terminology 802.11 and the OSI model Basic Terminology Types of Networks
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© 2010 by Foundstone - All rights reserved. Duplication of this material is expressly prohibited III-2 http://www.foundstone.com www.foundstone.com Copyright © 2010, McAfee, Inc. 802.11 Wireless Fundamentals 3-7 IEEE 802.11 and the OSI Model 802.11 is a Media Access Control and Physical Layer specification 802.11 www.foundstone.com Copyright © 2010, McAfee, Inc. 802.11 Wireless Fundamentals 3-8 Physical Layer (PHY) RF Spectrum - Channels h 802.11b/g 802.11b/g divides the 2.4 GHz spectrum into 14 overlapping (1- 14), staggered channels whose center frequencies are 5 megahertz (MHz) apart; this yields only 3 effective non- overlapping channels (1, 6, & 11) at 22MHz per channel h 802.11a The 5GHz spectrum provides 13 non-overlapping channels (36- 165) for use within the US and Canada (expanding to 22)
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Lecture 8 - wireless Part 1 - Ultimate Hacking Wireless...

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