1. 2006 MAM - Wireless Copyright © 2006 The Regents of the University of Michigan, Ann Arbor, MI 48109 June 23, 2006 Dennis Ward dward@umich.edu 76-39522

2. WLAN Today Copyright © 2006 The Regents of the University of Michigan, Ann Arbor, MI 48109 802.11 a/b/g  Listen before Talk / Half-Duplex  Majority of clients in-use are 802.11b/g  802.11b clients continue to be least expensive  Utilizes Unlicensed Spectrum: 2.4 GHz & 5 GHz  3 Non-overlapping 2.4 GHz Channels  12 Non-overlapping 5 GHz Channels - some caveats  11 New Channels Approved in July 2004 by FCC  New Channels use 5 GHz:  5470 - 5725 MHz  Channels not yet authorized for use  No specific timeline for FCC authorization

3. WLAN Today Copyright © 2006 The Regents of the University of Michigan, Ann Arbor, MI 48109  Every wireless card carries the following statement:  This device complies with part 15 of the FCC rules. Operation is subject to the following conditions:  (1) This device may not cause harmful interference, and  (2) this device must accept any interference received, including interference that may cause undesired operation.

4. Predominant Architectures Copyright © 2006 The Regents of the University of Michigan, Ann Arbor, MI 48109  Legacy “Fat” AP  Stand-Alone AP individually configured  Higher labor costs due to configuration requirements  relatively mature  Controller / “Thin” AP  AP’s tunnel back to central controller  Higher overall equipment costs - unique appliance  still underdevelopment - complaints of unstable s/w

5. WLAN Standard Progression Copyright © 2006 The Regents of the University of Michigan, Ann Arbor, MI 48109  802.11e - QoS - Approved September 2005  802.11i - Security - Approved June 2004  802.11k - Radio Resource Management  802.11ma - Standards Update  802.11n - High Throughput  802.11r - Fast Roaming  802.11s - Mesh Networking  802.11T - Wireless System Performance  802.11v - Wireless Network Management  802.11w - Secure Management Frames  http://grouper.ieee.org/groups/802/11/Reports/802.11_Timelines.htm

6. WLAN Issues for Education Copyright © 2006 The Regents of the University of Michigan, Ann Arbor, MI 48109  Guest Access  Who is a legitimate guest?  What, if any, limitations should be placed on a guest?  Virus Remediation  How to prevent infections from wireless users  Rogue AP’s  One’s rogue is another’s legitimate AP  Is a DoS attack appropriate in Education?  New demands by WLAN users  Indoor / Outdoor / Voice  Shared Media !