1. Sybex CCENT 640-822 Wireless Technologies Instructor & Todd Lammle

2. Wireless Objectives The CCNA Topics Covered in this chapter include: What is a WLAN? IEEE Standards ISM 2.4Ghz channels UNII Band CSMA/CA 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. Unlicensed Frequencies 4

5. 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 5

6. 802.11b CSMA/CA 6

7. ISM 2.4 Ghz Channels 7

8. UNII 5Ghz Band 8

9. Range Comparisons 9

10. IBSS 10

11. EBSS 11

12. Wireless Security All Wi-Fi Certified wireless LAN products are shipped in "open-access" mode, with their security features turned off. SSID, WEP and MAC authentication 802.11i WPA and WPA 2 12

13. Summary –Summary –Open your books and go through all the written labs and the review questions. –Review the answers in class. 13