simple presentation on Wi-fi by NIIT students of Thane

2. CREATED BY :-
•SHYAM NAIR
•ABHEESH NAIR
•DHANESH
DHAMNASKAR
•GOKUL NAIR

3. What is Wi-Fi ?
Wireless Fidelity.(wi-fi)
 Wi-Fi is a simple, cost-effective way to connect to
the Internet.
 Wi-Fi is something that works without wires.It
minimizes the need for long cables running from one
end of the room to the other or from floor to floor.
 Implementing a Wi-Fi solution could thus even be
cheaper than implementing a conventional, wired
solution, as not only does it eliminate the need for
long Network Cables, it also does not need a Network
Socket for every Computer!

4. A  WiFi uses unlicensed radio spectrum
D and does not require regulatory approval
for individual deployers
V
A  Prices are considerably lower as
N competition amongst vendors' increases.
T
A  Numerous access points and network
interfaces support various degrees of
G encryption to protect traffic from
E interception.
S

5.  WiFi has a set of global
standards. Not like the cellular
carriers, the same WiFi users
can work in different countries
around the world at all time
 Itallows local area
networks (LANs) to be
setup with cabling. The
can reduce associated
costs of network
connection and
expansions

6. 1. Free access points can be
used by the malicious to D
anonymous to initiate an
attack that would be I
extremely difficult to track
beyond the owner of
S
the access point. A
D
3. Access points could be used to
V
steal personal and confidential A
information transmitted from WiFi
consumers N
T
2. Inter-operability issues A
between brands or G
deviations can cause
limited connection or lower E
output speeds.
S

7. Access points could be
used to steal personal
and confidential
information transmitted
from WiFi consumers
•The spectrum assignments
and operational
limitations are notconsistent
worldwide.
Power consumption is fairly high
compared to some other
standards, making the battery life
and heat a concern to some users.

8. • The most common wireless encryption
standard, wired equivalent privacy or
WEP has been shown to be breakable even
when it has been correctly configured
•WiFi networks have limited range. A typical
WiFi home router might have a range of 45m
(150ft) indoors and 90m (300ft) outdoors.
Ranges may also vary as WiFi is no
exception to the physics of radio wave
propagation with frequency band.
•WiFi uses the unlicensed
2.4GHz spectrum, which often
crowded with other devices such as
Bluetooth, microwave
ovens, cordless phones, or video
sender devices, and among many
others. This may cause degradation
in performance.

9. FEATURES OF WIFI
 Unmatched mobility and elasticity
 new intensity of connectivity
without giving up functions
 introduced various types of utilities
such music streamers that transmit your
music to speakers without any wire
 Fortress Technology
providing secure wireless solutions support
the growth
release of a prototype mobile ad hoc wireless network for
use in the wireless strategic skirmish.

10.  Support an entire age bracket.
 support an entire age bracket
 create a connection between
components on the same
network
 have ability to transfer data
between the devices
 enable different kind of devices such as
game,and much more

11.  It's convenient and every where
range station exists you are online during travel you
can equip with a Wi-Fi network and set up shop
anyplace.
connect with internet if you are near
hotspot. These days WiFi exist every where
with all its wonders.
 WiFi with no limitation
 it can connect you worldwide.
 WiFi networking applications because the power
consumption is very high as compared to other bandwidth

12. Security concerns
 simple to set Wi-Fi network but keeping it
secure takes much more effort
 Access points of Wi-Fi do not
deploy encryption methods.
 Secure Wi-Fi network can be easily attacked
by hackers to steal private information.

13. Interference from other devices
 Wi-Fi transmits data at 2.4 GHz making
susceptible to interfere Bluetooth enabled
devices.
Microwaves and other communication
devices, closer the interfering devices
are the poor communication will be and
vice versa.
Lacking high-quality media streaming
 High definition video and audios
cannot be viewed flawlessly because
of lower transfer rate

14. things can be much more worst if other clients are
accessing the same access points.
 High-definition audio and video files are
timely-delivery-intensive, and typical
wireless networks have neither the transfer
speeds nor the consistency to transfer them
flawlessly.

15. PARTS OF WIFI
------------------------------------------------------------------------
 Wireless Routers
 One of the main parts of the wireless networks
 connect the DSL and the modem used in
the networking from that particular Wifi
device.
 Every type of router can be able to support
different type of protocols and also supports the
firewall setting to provide the protection to the
networking system.

16.  Antennas
 Two different types of antennas :-
1. omni directional
2. Directional
 directional antennas can communicated with the other
device in a specific direction
 omni directional can do communication
between the 360 degree angle.
 Wireless Network Adapters
 used to connect the system wirelessly
supports every standard of the wired or the wireless networks

17.  Wireless Access Point
 The purpose of using the wireless access points in the Wifi
is to create a connection between the Ethernet cable and the
wireless users.
 Wireless access point also
work as centre point for the user
called as infrastructure.
data transmission between the wireless and the wired
devices the connection of the wireless access point is
connected with wireless router and then the router integrates
between the WAP and NS.

18.  Wireless Print Server
wireless pint servers are also equipped with
the Wifi device for the sake of the connecting or
sharing the two or more different printers
They are connected wit the
help of USB cables.
 Ports and the cables really play a major role as
an equipment of the Wifi because they are the
source of connecting different devices that are
external to the wireless LAN or the Wifi device.
Fiber cables are also used for such purpose.

19. How does wi fi ?
works
 A wireless network uses radio waves, just like cell phones,
televisions and radios do
 communication across a wireless network is a lot like two-way
radio communication.The radios used for WiFi communication
are very similar to the radios used for walkie-talkies, cell phones
and other devices.
 They can transmit and receive radio waves, and they can
convert 1s and 0s into radio waves and convert the radio waves
back into 1s and 0s
WiFi radios have a few notable differences from other
radios.They transmit at frequencies of 2.4 GHz or 5 GHz

20.  This frequency is considerably higher than the
frequencies used for cell phones, walkie-talkies and
televisions.
 The higher frequency allows the signal to carry more
data
----802.11a transmits at 5 GHz and can move up to 54
megabits of data per second.
----802.11b is the slowest and least expensive standard
---802.11g transmits at 2.4 GHz like 802.11b, but it's a lot
faster -- it can handle up to 54 megabits of data per
second.

21. ----802.11n is the newest standard that is widely available.
This standard significantly improves speed and range. The
standard is currently in draft form -- the Institute of Electrical
and Electronics Engineers (IEEE) plans to formally ratify
802.11n by the end of 2009.

22. -Uses for common man
 Person uses wifi or other
wireless connection to
communicate to groups of
audiences
-Wi-Fi CERTIFIED handsets mean
service providers can be confident
that the devices on their network are
going to deliver the very best
experience to their subscribers
 -Wi-Fi's advanced performance
and wide availability in
homes, schools, enterprises and
hotspots are key drivers of global
user affinity for the technology.

23. -Uses for an enterprises
Wi-Fi CERTIFIED devices offers the security and performance
that network managers expect along with five times the
throughput and twice the range of legacy Wi-Fi equipment
Wi-Fi CERTIFIED programs provide a
third-party seal of approval for
interoperability and security of enterprise-
grade equipment. The Wi-Fi CERTIFIED
interoperability certificate is the definitive
record of a product's testing.
Faster transmissions allow stations to get on and off the air
more quickly. Legacy clients in the network can benefit from
better coverage provided by the 802.11n access points and they
can also gain increased access as the new 802.11n devices
transfer their data faster

24. 3G vs Wi-Fi – Functioning
3G is a service that is completely provided by the service provider, whereas
Wi-Fi access can be controlled by a Wi-Fi router located in a specific range
from the access point. For availing the Wi-Fi facility, you will have to visit a
hotspot which provides a Wi-Fi zone. Today, most malls, cafes, and major
streets have Wi-Fi routers for quick Internet access. For availing 3G, you need
to get in touch with your service provider.
3G vs Wi-Fi - Range and Signal
The 3G technology scores well over Wi-Fi with regards to range and signal.
Since it depends on the mobile service provider, you will receive signal
reception as long as you are in the network range. In case of Wi-Fi, you will be
able to receive reception as long as you are within the range of
the router situated in the hotspot. Therefore, while traveling, using 3G access is
more appropriate. However, 3G signals may drop if you are traveling away from
metropolitan cities.

25. 3G vs Wi-Fi - Speed
When it comes to the speed of both these technologies, Wi-Fi is faster as
compared to 3G. The maximum speed of the 'N' standard of the latest Wi-Fi
technology is reported to be 600 mbps. The data transfer speeds in 3G
technology differs according to the kind of device and also whether it is
stationary or in motion. The maximum speed on 3G network is considered to be
about 2.05 mbps. However, if the reception is to be initiated on a cell phone in a
moving vehicle, the speed can drop down to 128 kbps.
3G vs Wi-Fi - Cost
The cost of 3G access depends on the plan you have chosen from your
service provider. When it is regarding availing Wi-Fi facilities, you might have
to pay the owners of the hotspots. Wi-Fi at some hotspots is free, while others
may charge a certain amount. Users of the Wi-Fi facility at hotels and cafes
can either pay using a credit card on a payment page hosted by the
appropriate authorities, or can pay in cash for getting the network access
code. Some hotspots are even code free, and you can directly access the
web without the access password.

27. Bluetooth vs. Wi-Fi :Both have lots of
features of connectivity, printing and
transferring of data. No doubt Wi-Fi and
Bluetooth is the basic need of modern age
but have some differentiation as follow
The technology of Bluetooth is functional when broadcasting of information
among more than two devices exist near as headset, modem, printer etc while
Wi-Fi operating on full scale because it is a much faster than Bluetooth.
The hardware requirements of Wi-Fi and Bluetooth are entirely different, Through
Bluetooth adapter you can connect devices with each other. While in Wi-Fi network you
need an adapter, router and access point to enable connection.
The bandwidth required for Bluetooth is only 800 kbps and for Wi-Fi
11Mbps bandwidth require. Wi-Fi network come into existence in 1991 and
Bluetooth in 1994.The specification of Bluetooth is SIG and Wi-Fi is
IEEE, and WECA.

28. The security level of both Bluetooth and Wi-Fi is also different from each
other. Bluetooth has only 2 level of password to wrap little distance and escape
user time.
Wi-Fi is a risky network because when lots of network attached with each other
then hacker may try to access toward connected user and if succeed your data
may be stolen.

29. Comparing Wi-Max to Wi-Fi is akin to
comparing apples to oranges. Initially it’s
easy to see why the comparison would
exist
Uses of Wi-Fi vs. the uses of WiMAX
Wi-Fi is mostly used to provide a Wi-Fi enabled device such as a computer,
cell phone or PDA an Internet/LAN connection when in proximity of an access
point. Wi-Fi can also be used to create a mesh network. Wi-Fi also allows
connectivity in peer-to-peer mode, which enables devices to connect directly
with each other.
WiMAX on the other hand with its higher bandwidth and longer reach is
planned to be used for connecting Wi-Fi hotspots with each other and to other
parts of the Internet, providing a wireless alternative to cable and DSL for last
mile (last km) broadband access, providing high-speed mobile data and
telecommunications services (4G).

30. Capacity of Wi-Fi vs WiMAX
Both the Wi-Fi and the WiMAX connectivity are dependent on the distance of
two connection points (antennas). Keeping this in mind we can see that when
using Wi-Fi with the IEEE 802.11g standard, which is the most common
standard used on today’s equipment, the data rate is around 54 Mbit/s and the
range indoors are around 30 meters. This range and data rate is changed with
the conditions of the area used and the line of sight of devices used.
WiMAX will deliver 70 Mbit/s, 112 kilometers in theory. But these numbers will
change according to conditions, expected values are 10Mbit/s in a 2 KM area.