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Understanding Cisco Wireless Technologies: An Overview of WLAN and IEEE Standards

Chapter 14 of the CCNA 640-802 guide covers essential topics related to Cisco Wireless Technologies. Key concepts include the definition of WLANs, IEEE standards such as 802.11b, 802.11g, 802.11a, and 802.11n, and wireless security measures. The chapter explains CSMA/CD, ISM channels, and the operation of wireless LANs that use radio frequencies for communication. It provides insights into basic service sets, extended service sets, and advanced security protocols like WPA and WPA2. Backed with practical labs and review materials, this chapter enhances understanding of WLAN technologies.

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Understanding Cisco Wireless Technologies: An Overview of WLAN and IEEE Standards

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  1. Instructor & Todd Lammle Sybex CCNA 640-802 Chapter 14: Cisco Wireless Technologies

  2. Chapter 14 Objectives The CCNA Topics Covered in this chapter include: • What is a WLAN? • IEEE Standards • CSMA/CD • ISM channels • UNII Band • BSS/ESS • Wireless Security 2

  3. Wireless LAN’s • Transmitting a signal using the typical 802.11 specifications works a lot like it does with a basic Ethernet hub: They’re both two-way forms of communication, and they both use the same frequency to both transmit and receive, often referred to as half-duplex. • Wireless LANs (WLANs) use radio frequencies (RFs) that are radiated into the air from an antenna that creates radio waves. 3

  4. Wireless agencies and standards 4

  5. Unlicensed Frequencies 5

  6. 802.11 Standards Here are the most popular standards in use today: • 802.11b: 2.4Ghz, maximum bandwidth of 11Mbps • 802.1g: 2.4Ghz, up to 54Mbps • 802.11a: 5Ghz, up to 54Mbps • 802.11n: Higher throughput improvements using MIMO (multiple input, multiple output antennas) 6

  7. 802.11 CSMA/CA 7

  8. ISM 2.4 Ghz Channels 8

  9. UNII 5Ghz Band (802.11a) 54 mbps 9

  10. Range Comparisons 10

  11. 2.4GHz/5GHz (802.11n) The following three vital items are combined in 802.11n to enhance performance: • At the Physical layer, the way a signal is sent is changed, enabling reflections and interferences to become an advantage instead of a source of degradation. • Two 20Mhz-wide channels are combined to increase throughput. • At the MAC layer, a different way of managing packet transmission is used. 11

  12. Comparing 802.11 12

  13. Ad Hoc mode 13

  14. Basic Service Set (BSS) 14

  15. Extended Service Set 15

  16. Wireless Security • Open Access • SSIDs, WEP, and MAC Address Authentication • Wi-Fi Protected Access (WPA) • WPA or WPA2 Pre-Shared Key • WPA or WPA2 Enterprise • 802.11i • Encryption Methods • Temporal Key Integrity Protocol (TKIP) • AES 16

  17. WPA/WPA/802.11i summary 17

  18. Wireless Security Implementations 18

  19. Summary • Summary • Open your books and go through all the written labs and the review questions. • Review the answers in class. 19

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