1. PRESENTATION ON WI-FI TECHNOLOGY

2. Contents Need of WIFI Introduction Wi-Fi Technologies
Wi-Fi Network Elements
Wi-Fi Architecture
How a Wi-Fi Network Works
Wi-Fi Network Topologies
Wi-Fi Security
Post Implementation
Advantages/ Disadvantages of Wi-Fi
Applications

3. NEED ???? Higher authorities do not want wiring
When guest/auditor comes then installation of new LAN is not possible
Employees seat is not fixed
Handling of cables(wires) is difficult K

4. Introduction Wireless Technology is an alternative to Wired
Wi-Fi Network connect computers to each other, to the internet and to the wired network. A

5. The Wi-Fi Technology
Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed:
IEEE b
IEEE a
IEEE g K

6. Operates at 2.4GHz radio spectrum 100 -150 feet range
IEEE b
Operates at 2.4GHz radio spectrum
feet range
Most popular, Least Expensive
IEEE a
Operates at 5 GHz (less popular)
50-75 feet range
More expensive,Not compatible with b
B-K
A-A

7. Combine the feature of both standards (a,b) 100-150 feet range
IEEE g
Combine the feature of both standards (a,b)
feet range
2.4 GHz radio frequencies,Compatible with ‘b’ K

8. Elements of a WI-FI Network
1.Switch --- Nortel WLAN Access point --- NORTEL WLAN Devices --- Mobiles, Laptop, Personal computers 4.WIFI Cards--- PCMCIA Cards, PCI Cards 5.Safeguards--- Antivirus & Firewalls A

9. WI FI Architecture
A,K

10. How a Wi-Fi Network Works
Basic concept is same as Walkie talkies.
A Wi-Fi hotspot is created by installing an access point to an internet connection.
An access point acts as a base station.
When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly.
A single access point can support up to 30 users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors.
Many access points can be connected to each other via Ethernet cables to create a single large network.
A-k

11. How are Multiple Transmitters Supported ?
Carrier Sense Medium Access with collision avoidance protocol (CSMA/CA)
Listen before talking
Avoid collision by explicit Acknowledgement (ACK)
Problem: additional overhead of ACK packets, so slow performance K

12. Wi-Fi Network Topologies
AP-based topology
Peer-to-peer topology
Point-to-multipoint bridge topology
A,K

13. AP-based topology
The client communicate through Access Point. k

14. Peer-to-peer topology
AP is not required.
Client devices within a cell can communicate directly with each other.
It is useful for setting up of a wireless network quickly and easily. a

15. Point-to-multipoint bridge topology
This is used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart. These conditions receive a clear line of sight between buildings. k

16. WI-FI Security
The requirements for Wi-Fi network security can be broken down into two primary components:
Authentication
User Authentication
Server Authentication
Privacy A

17. WI-FI Security Techniques
Service Set Identifier (SSID)
Wired Equivalent Privacy (WEP)
802.1X Access Control
Wireless Protected Access (WPA)
IEEE i
A,K

18. Post Implementation Test
There are basically two types of testing to be done
1. QTR-WEB Testing
2. QTR-GUEST Testing

19. QTR-WEB Testing
Step1:
Click on Wireless icon on the Taskbar K

20. Step 2: Below shown window will appear, click on Refresh network list.

21. Step 3: Double click on QTR-Web WI-FI Connection.

22. Step 4: Insert the Authentication Key Step 5: Wait for few moments, while it is accruing the IP address A

23. Step 6: After acquiring the IP address it will show the connected as shown belowK

24. Step 7:Now try to open any link it will redirect to the authentication page put user domain login ID and Password A

25. Step 8: Click on Yes on the below Security alert

26. Step 9: It will be authenticated if below message will be shown on the web screen.

27. Advantages Mobility Ease of Installation Flexibility Cost Reliability
Security
Use unlicensed part of the radio spectrum
Roaming
Speed K

28. LIMITATIONS Interference Degradation in performance
High power consumption
Limited range A

29. Wi-Fi Applications Home Small Businesses Large Corporations & Campuses
Health Care
Travellers K

30. THANKS A