Sybex CCNA 640-802
Chapter 12: Wireless Networks
Instructor & Todd Lammle
Chapter 12 Objectives
The CCNA Topics Covered in this chapter
include:
• What is a WLAN?
• IEEE Standards
• CSMA/CD
• ISM ...
Wireless LAN’s
• Transmitting a signal using the typical
802.11 specifications works a lot like it
does with a basic Ether...
Unlicensed Frequencies
4
802.11 Standards
Here are the most popular standards in use
today:
• 802.11b: 2.4Ghz, maximum bandwidth of
11Mbps
• 802.1g...
802.11b CSMA/CD
6
ISM 2.4 Ghz Channels
7
UNII 5Ghz Band
8
Range Comparisons
9
BSS/ESS
10
Wireless Security
All Wi-Fi Certified wireless LAN products are
shipped in "open-access" mode, with their
security feature...
Summary
– Summary
– Open your books and go through all the
written labs and the review questions.
– Review the answers in ...
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Chapter12ccna

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Chapter12ccna

  1. 1. Sybex CCNA 640-802 Chapter 12: Wireless Networks Instructor & Todd Lammle
  2. 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. 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. 4. Unlicensed Frequencies 4
  5. 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. 6. 802.11b CSMA/CD 6
  7. 7. ISM 2.4 Ghz Channels 7
  8. 8. UNII 5Ghz Band 8
  9. 9. Range Comparisons 9
  10. 10. BSS/ESS 10
  11. 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. 12. Summary – Summary – Open your books and go through all the written labs and the review questions. – Review the answers in class. 12

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