The document discusses Wireless Fidelity (WiFi) and wireless local area networks (WLANs). It defines WiFi and WLAN, lists common WiFi standards (802.11a, b, g), components (access point, adapter card, router), topologies (infrastructure, peer-to-peer, point-to-multipoint), and security measures (WEP, WPA, SSID). It also covers features of different WiFi standards like 802.11a and 802.11b including their radio frequency bands, data transfer speeds, and ranges.

2. 1. Full Form – Wireless Fidelity.
2. Requirements – AP, Adapter Card, Safeguard
3. Can Connect Devices through Wireless
Topologies.
4. A Wireless LAN is called WLAN.
5. Standards – IEEE 802.11a / b / g.

3. Referred as LAN Transceiver, Base
Station or Router.

4. 1. Comes Internally or Externally.
2. PCMCIA Cards for Laptops, & PCI Cards
for PCs.

5. Firewall & Anti Virus

6. 1. Infrastructure ( AP based)
2. Peer to Peer (Ad Hoc)
3. Point to Multipoint Bridge

10. 1. Radio Frequency Band : 5 GHz
2. Range : 100 – 150 feet
3. Data Transfer : 54 Mbps
4. Features : Popular & Cheap.
Interference from Mobiles & Bluetooth can reduce
transmission Speed.
* Click here for Wikipedia Reference.

11. 1. Radio Frequency Band : 2.4 GHz
2. Range : 100 – 150 feet
3. Data Transfer : 11 Mbps
4. 2.4 Band Users : Bluetooth devices, Cordless
Telephones.
Same as 802.11b, but is more advanced with the Data
Transfer Speed of 54 Mbps.

12. 1. Omni : Bidirectional
2. Yagi : Unidirectional
1. SSID : Security Set Identifier
2. WEP : Wireless Equivalent Privacy
3. WPA : Wi – Fi Protected Acces
* Click here for full details.

13. 1. Mobility.
2. Easy Installation.
3. Good Flexibility.
4. Security.
5. Uses Unlicensed part of Radio Spectrum.

14. 1. Interference.
2. Degradation in Performance.
3. High Power Consumption.
4. Limited Range.