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1. Name- Nazrin Parveen
Roll no. 33

2. outline
 What is Wi-Fi?
 purpose
 Wi-Fi network elements
 How a Wi-Fi network works
 Wi-Fi network topologies & security techniques
 Advantages & limitations of Wi-Fi

3. What is Wi-Fi?
 Wi-Fi means “Wireless Fidelity”.
 Wireless Technology is an alternative to wired
technology, which is commonly used, for connecting
devices in wireless mode.
 Wi-Fi is a generic term that refers to the IEEE 802.11
communications standard for wireless local area
networks (WLANs).

4. Purpose
 The purpose of Wi-Fi is to hide complexity by enabling
wireless access to applications and data , media and
streams.
 The main aims of Wi-Fi are the following:
1. Make access to information easier.
2. Ensure compatibility and co-existence of devices
3. Eliminate cabling and wiring
4. Eliminate switches, adapters, plugs, pins and
connectors.

5. Wi-Fi network elements:
 Access point(AP)- The AP is a wireless LAN transceiver or
“base station” that can connect one or many wireless
devices simultaneously to the internet.
 Wi-Fi Cards- They accept the wireless signal and relay
information. They can be internal and external.
 Safeguards- Firewalls and anti-virus software protect
networks from users and keep information secure.

6. 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 the network wirelessly.

7. Wi-Fi network topologies
 Service set Identifier(SSID)
 Wired Equivalent Privacy(WEP)
 IEEE 802.11i
Wi-Fi security techniques
 AP-based topology( infrastructure mode)
 Peer-to-peer topology(Ad-hoc mode)
 Point-to-multipoint bridge topology

8. Advantages
 No wires- A truly wireless networking solution.
 No worries- A wireless networking system that is secure, easy to
manage, and built to grow with you.
 No waiting- Fast, easy deployments.
LIMITATIONS
 Limited range
 Data security risks: a huge challenge for Wi-Fi networks.
 Interference from other devise; such as telephones, microwave
ovens.