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LM 3. WLAN Overview

LM 3. WLAN Overview. Dr. Lei Li. Road Map. Introduction. Mobile Security. Security Auditing & Risk Analysis. WLAN Security. Mobile Network Overview. Evolution of Wireless Network. WLAN Overview. Infro . Security Essentials. WLAN Threats & Vulnerabilities. Cellular Network

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LM 3. WLAN Overview

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  1. LM 3. WLAN Overview Dr. Lei Li

  2. Road Map Introduction Mobile Security Security Auditing & Risk Analysis WLAN Security Mobile Network Overview Evolution of Wireless Network WLAN Overview Infro. Security Essentials WLAN Threats & Vulnerabilities Cellular Network Security WLAN Security Mobile Security Threats WLAN Security Tools Mobile Devices Security

  3. Learning Outcomes After this module, a student will be able to: • Describe the signaling technology for WLAN • Identify the common 802.11 standards • Describe how WLAN works • Describe mobile ad hoc network (MANET) • Explain what’s Bluetooth and how it different from Wi-Fi • Discuss the essentials for WLAN design • Discuss the basics of Wireless LAN site survey • Discuss the emerging technology in WLAN

  4. WLAN Signaling • Radio frequency technology • Use 2.4GHz and 5 GHz unlicensed bands • Free to use without government license • Propagation problem • May interfere with other networks and other devices using the same band

  5. Most serious: Multipath interference Image source: https://home.ubalt.edu/abento/427/adapters2/sld073.htm

  6. Spread Spectrum • Narrow band • Smaller channel bandwidth and greater transmission power • Spread Spectrum • Used by WLAN • Larger channel bandwidth and lower power • Reduce interference • FHSS & DSSS

  7. WLAN Standards • 802.11 workgroup http://www.l-com.com/blog/post/2015/12/17/WiFi-Alphabet-Soup.aspx

  8. WLAN Topology • Extension of wired network • Topology • Stations • Basic service set/extended service set • Distribution system • Access point

  9. Image source: https://www.slideshare.net/AhmarShoebHashmi/14-wireless-lan

  10. Image source: http://slideplayer.com/slide/6083009/

  11. WLAN Design • More than just one product • Wireless network are more complicated than ever • Iterative process (WLAN planning never stops)

  12. WLAN Site Survey • AP placement • Channel interference • Survey types • Passive site survey • Active site survey • Predictive site survey

  13. MANET • A mobile ad-hoc network • No fixed infrastructure is needed. • Good for military application, disaster relief, environmental monitoring etc. • Drawbacks • Network performance • Routing

  14. Bluetooth • Personal network • 2.4Ghz unlicensed band • Low bandwidth • Lower power consumption • Smaller coverage range • Easy to use

  15. Emerging Wireless Technology • Internet of Things • Zigbee • Bluetooth Low Energy Image source: https://en.wikipedia.org/wiki/Internet_of_things

  16. Reference • Praphul Chandra, Bulletproof Wireless Security: GSM, UMTS, 802.11, and Ad Hoc Security, ELSEVIER, 2005. • Jim Doherty, Wireless and Mobile Device Security, Jones & Bartlett Learning, 2016. • https://www.networkcomputing.com/networking/wireless-beginners-part-1-rf-and-waves/1640728721 • http://searchnetworking.techtarget.com/answer/Whats-the-difference-between-licensed-and-unlicensed-wireless • http://student.ing-steen.se/wlan/Chapter_3.pdf • https://en.wikipedia.org/wiki/IEEE_802.11 • https://en.wikipedia.org/wiki/Wireless_LAN • https://en.wikipedia.org/wiki/Mobile_ad_hoc_network • https://www.diffen.com/difference/Bluetooth_vs_Wifi • https://www.securedgenetworks.com/blog/3-wlan-design-best-practices-essential-to-deliver-a-better-user-experience • https://www.networkcomputing.com/wireless/wireless-site-surveys-basics/861543211 • https://arxiv.org/pdf/1611.00861.pdf

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