WIFI--Network
Name:
SRIKANTH R
ROLL:
21CSR204
A overview of what we are going to see in this
What is meant by wifi?
Wifi standards
Equipment for wifi
Connecting to wifi
Wifi security
Wifi range
what is meant by wifi
•WiFi is the wireless way to handle networking.
•It is also known as ieee 802.11 networking.
•You can connect computers anywhere in your
home or office without the need for wires.
•The computers connect to the network using
radio signals, and computers can be up to 100
feet or so apart.
WiFi Standards
4 common standards exist:
• 802.11a 5 GHz band
• 802.11b 2.40 GHz band
• 802.11g 2.40 GHz band
• 802.11n 2.4 or 5 GHz band
Equipment For WiFi
Typically WiFi requires 3 main pieces to be in place:
• A WAN connection
• Either a router or access point to transmit data to
and from wireless clients.
• An interface for the client to connect
Connecting to WiFi
Connecting to WiFi
• Access Point (infrastructure mode) – usually an area
of connection is referred to as a hotspot. So if your
local coffee shop has an access point than you can
say that they are a hotspot.
• A Peer (ad-hoc mode) – usually means connecting
to another wireless device within range of your device.
Adding WiFi to Your Computer
• One of the best things about WiFi is how simple
it is.
• Many new laptops already come with a WiFi
card built in -- in many cases you don't have to
do anything to start using WiFi.
• It is also easy to add a WiFi card to an older
laptop or a desktop PC.
Adding WiFi to an Older
Computer
• Install the drivers for the card
• Find an 802.11 hotspot.
• Access the hotspot.
Hotspot: a connection point for a WiFi network. It is a
small box that is hardwired into the Internet. The box
contains an 802.11 radio that can simultaneously talk
to up to 100 or so 802.11 cards.
Connecting to a Hotspot
• There are actually two steps to making a connection.
• The first is to have your notebook "talk" to the
hotspot, which means that the hardware and hotspot
must recognize each other. This should happen
automatically as long as your wireless hardware is
turned on and new.
Connecting to a Hotspot
• On most notebook models, you will see some sort of
signal icon on the bottom right hand corner of your
screen or a lit indicator on the notebook itself, which
will give you feedback for "On" and signal strength
(a red screen means your radio is Off; a green
screen indicates it is On).
OFF
ON
• You can also see the quality of the signal by clicking
on the radio icon (may vary by system):
Another Way to Amplify WiFi
Signals
A WiFi repeater
is installed to
extend
coverage.
Wireless
Access Point
WiFi Security
• WiFi hotspots can be open or secure.
• If a hotspot is open, then anyone with a WiFi card
can access the hotspot.
• If it is secure, then the user needs to know a WEP
key to connect.
• WEP stands for Wired Equivalent Privacy
WiFi Security (Cont’d)
• WEP is an encryption system for the data that
802.11 sends through the air.
• Encryption system prevents any non-authorized
party from reading or changing data.
• Specifically, it is the process of encoding bit stream
in such a way that only the person (or computer)
with the key (a digital sequence) can decode it.
Setting up a Hotspot at Home
• If you already have several computers hooked
together on an network and want to add a wireless
hotspot to the mix, you can purchase a Wireless
Access Point and plug it into the network.
Wireless Access Point
Alternate Setup using a
Wireless Router
• you can buy a Wireless Access Point Router.
• This is a single box that contains:
– 1) a port to connect to your cable modem or DSL
modem,
– 2) a router,
– 3) an internet hub,
– 4) a firewall and
– 5) a wireless access point.
• You can connect the computers in your home to this box
either with traditional internet cables or with wireless cards.
Alternate Setup (Cont’d)
WiFi Range
• Regardless of which setup you use, once you turn your
Wireless Access Point on, you will have a WiFi hotspot
in your house.
• In a typical home, this hotspot will provide coverage for
about 100 feet (30.5 meters) in all directions, although
walls and floors do cut down on the range.
• Even so, you should get good coverage throughout a
typical home. For a large home, you can buy
inexpensive signal boosters to increase the range of the
Hotspot.
Conclusion:
Finally one thing
We have many advantage and disadvantage
while using wifi
If we are using it effectively in a useful manner
means,I will sure that we will get all benifits