Syed Mati Ur Rehman

1. Networking Presentation
Topic: Wi-fi
Group
Didar Hussain Rno:30
Adnan Khan Rno:38
Mati Ur Rehman Rno:35
Muhammad Javed Rno:17
114 November 2017 Bacha Khan University Charsadda

2. CONTENTS
2
• Wi-fi introduction
• Access point
• Service set
• Stations
• How wi-fi works
• Advantages of wi-fi
• Security
• Questions
• Reference
14 November 2017 Bacha Khan University Charsadda

3. WIFI
• IEEE has defined the specifications for a
wireless LAN, called IEEE 802.11, which
covers the physical and data-link layers.
It is sometimes called wireless Ethernet
• In some countries, including the United
States, the public uses the term WiFi
(short for wireless fidelity) as a synonym
for wireless LAN
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4. WIFI
• Wifi means "Wireless Fidelity”.
• Wifi is a set of standards for wireless local
area networks(WLAN)
• Based on the IEEE 802.11
• It’s like a common language that all the
devices use to communicate to each other.
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5. WIFI
• WiFi promoting the growth of wireless
LANs.
• In simple words Wifi connect devices to
each other uses wirelesslan mean there is
no cable or wires are used
• All devices connected to each other
through access point
• Access point works as central controller
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6. WIFI
Access Point
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7. TYPES OF ACCSS POINT
• There are two types of access point
1-Hardware access point
2-Software access point
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8. HARDWARE ACCESS POINT
• Hardware access points
are available with
various types of network
interfaces, such as
Ethernet or Token Ring,
but typically require
extra hardware to be
purchased if your
networking
requirements change
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9. SOFTWARE ACCESS POINT
• A software access point
does not limit the type
or number of network
interfaces you use. It
may also allow
considerable flexibility in
providing access to
different network types
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10. SERVICE SET
• The standard defines two kinds of services:
(1) Basic service set (BSS)
(2) Extended service set (ESS).
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11. BASIC SERVICE SET
• IEEE 802.11 defines the basic service set
(BSS) as the building blocks of a wireless
LAN.
• A basic service set is made of stationary
or mobile wireless stations and an
optional central base station, known as
the access point (AP).
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12. BASIC SERVICE SET
• The BSS without an AP is a stand-alone
network and cannot send data to other BSSs.
It is called an ad hoc architecture.
• In this architecture, stations can form a
network without the need of an AP; they can
locate one another and agree to be part of a
BSS.
• A BSS with an AP is sometimes referred to as
an infrastructure BSS.
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13. BASIC SERVICE SET
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14. EXTENDED SERVICE SET
• An extended service set (ESS) is made up of
two or more BSSs with APs.
• In simple words it is a combination of basic
service set
• Here the APs connected to each other in the
BSSs.
• IEEE 802.11 does not restrict the distribution
system; it can be any IEEE LAN such as an
Ethernet.
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15. EXTENDED SERVICE SET
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16. STATIONS
• The extended service set uses two types of
stations:
1-Mobile Station
2-Stationary Station
• The mobile stations are normal stations inside
a BSS.
• The stationary stations are AP stations that are
part of a wired LAN.
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17. HOW WIFI WORKS?
• WiFi is used to transmit data, allow
computers to the internet and allow
computers to connect to wireless resources
such as hard drives, printers and other
external devices.
• One could connect to a wireless printer,
camera, or hard-drive using a mobile phone
or PDA.
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18. HOW WI-FI WORKS ?
• This would allow to save documents onto
a wireless hard-drive which could be
wirelessly accessed by a PDA or mobile
phone and wirelessly printed
• So Wifi would remove the need for
starting up a computer or laptop.
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19. TECHNOLOGY
• Wi-Fi has now become a very common
technology and is available widely and
cheaply on a range of devices.
• Examples of this include: IPhone Other
phones Cameras Printers etc.
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20. SECURITY
• WiFi has the capabilities for high levels of
security but often it requires people to set up
complicated passwords, user-names and access
keys.
• Wi-Fi has three main security protocols,
WEP(wireless encripted protocol) WPA(wireless
protected access) WPA2(wireless protected
access version2). Each of these standards has
different levels of security.
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21. ADVANTAGES OF WIFI
• Wi-Fi can make access publicly available at
wi-fi hotspots.
• Does not require regulatory approval for
individual.
• Wi-Fi network can support roaming.
• Wi-Fi allows local area network to deployed
without for client devices
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22. QUESTION 1
• What is the goal of IEEE 802.11?
Ans:
• To develop a Medium Access Control (MAC)
and Physical Layer (PHY) specification for
wireless connectivity for fixed, portable and
moving stations within a local area
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23. QUESTION 2
• Do I need any license to use 802.11 device ?
Ans:
• No , 2.4 GHz and 5.0 GHz are public available
frequency.
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24. CONCLUSION/LAST RESULT
• Today,wi-fi is mainly used for marketing
easy connection between a home
computer and internet
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25. REFERENCE
• Google(Slide share)
• Data communication and networking book
fifth editon (Behrouz A.Forouzan)
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26. ANY QUESTION ?
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