1. Instructor & Todd Lammle
Sybex CCNA
Chapter 12: Wireless Networks
Instructor & Todd Lammle

2. Chapter 12 Objectives The CCNA Topics Covered in this chapter include:
What is a WLAN?
IEEE Standards
CSMA/CD
ISM 2.4Ghz channels
UNII Band
BSS/ESS
Wireless Security 2

3. Wireless LAN’s
Transmitting a signal using the typical 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 Frequencies4

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/CD 6

7. ISM 2.4 Ghz Channels 7

8. UNII 5Ghz Band 8

9. Range Comparisons 9

10. BSS/ESS 10

11. 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 11

12. Summary
Summary
Open your books and go through all the written labs and the review questions.
Review the answers in class. 12