WIRELESS NETWORK AND
Prepared By :Prepared By :
Mohit MehraMohit Mehra
RUSTAMJI INSTITUTE OF
∗ A wireless LAN or WLAN is a wireless local area network that
uses radio waves as its carrier.
∗ The last link with the users is wireless, to give a network
connection to all users in a building or campus.
∗ The backbone network usually uses cables
Wireless LANs operate in almost the same way as
wired LANs, using the same networking protocols
and supporting the most of the same
How do wireless LANs work ?
Wireless network design
Any wireless network can be thought of as a combination of
one or more of these types of connections :
Point to Point
The simplest connection is the point-to-point link. These
links can be used to extend a network over great distances.
Point to Multipoint
When more than one computer communicates with a
central point, this is a point-to-multipoint network.
Multipoint to Multipoint
When any node of a network may communicate with any
other, this is a multipoint-to-multipoint network (also
known as an ad-hoc or mesh network)
• Position the Router or Access Point
• Create unique password on router
• Change default SSID name
• Reduce Wireless Signal Range
• Filter Mac Address
•Assign Static IP Addresses to Devices
• Check Who is Connected to your Network
• Enable Firewalls On Each Computer &
Anti WIFI Paint
∗ Researchers say they have created a
special kind of paint which can block
out wireless signals.
∗ It means security-conscious wireless
users could block their neighbors
from being able to access their home
network - without having to set up
• Turn Off the Network During Extended
Periods of Non-Use
•Upgrade your Router’s firmware
∗ In 1997, the Institute of Electrical and Electronic Engineers
(IEEE) drafted the 802.11 standard for wireless local area
∗ In 1999, networking hardware companies accepted the
standard and began manufacturing products using the
802.11b protocol which operated in the 2.4 GHz range and
was capable of transmitting at speeds of 11 Mbps.
∗ The 802.11a protocol was also released in 1999, operating
at 5.8 GHz with transmissions speeds of 54 Mbps, but its
cost was prohibitively high.
IEEE Wireless Standards
802.11b 802.11g 802.11a
Frequency Range 2.4 – 2.4835 GHz 2.4 – 2.4835 GHz 5.725 - 5.850 GHz
Max Speed 11 MBPS 54 MBPS 54 MBPS
Max Encryption 128 bit WEP 128 bit WEP 152 bit WEP
256 bit AES
Discrete Channels 3 3 8
802.11b, 802.11g 802.11b, 802.11g 802.11a
Potential user Entry level and
So why should you consider using a wireless network?
∗ More than simply a fun new gadget for tech-heads to play with, there are actually
many advantages to having a WiFi network.
∗ A home user may find it much more convenient to use his or her laptop computer in
the bedroom late at night and then move it to the den during the day.
∗ A corporate user may find it very beneficial to have the freedom to work at one desk
and then move to another without having to deal with networking cables.
∗ A speaker will find it very useful to simply bring their laptop to the podium and give a
presentation and not have to make sure the network is set up in that particular room,
deal with the cables, etc.
∗ Another main advantage is the simplicity of setting up a network.
∗ Instead of having to worry about wiring each individual desk or office to the main
server room, worry about which port goes where and which ports are active, you can
simply enable the access point and give the configuration to any new user that may
need access to the network.
∗ Ultra-high spectrum efficiency
∗ 5 GHz band is 300 MHz (vs. 83.5 MHz @ 2.4 GHz)
∗ More data can travel over a smaller amount of
∗ High speed
∗ Up to 54 Mbps
∗ Less interference
∗ Fewer products using the frequency
∗ 2.4 GHz band shared by cordless phones, microwave ovens,
Bluetooth, and WLANs
∗ 2.4 GHz will still has >40% cost advantage
At equivalent power, 5 GHz range will be ~50% of 2.4 GHz
∗ Power consumption
∗ Higher data rates and increased signal require more
∗ Building-to-building connections
∗ Video, audio conferencing/streaming video,
∗ Large file transfers, such as engineering
∗ Faster Web access and browsing
∗ High worker density or high throughput scenarios
∗ Numerous PCs running graphics-intensive applications
∗ There is little wonder why wireless networks have become so
ubiquitous the last few years. Wireless access points are
inexpensive, easy to install, and most of all, handy. Although
wireless networking can make life a lot easier for your users
though, they can also become a security nightmare.