Wirelessnetworks mohit mehra


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Wirelessnetworks mohit mehra

  1. 1. WIRELESS NETWORK AND ITS SECURITY Prepared By :Prepared By : Mohit MehraMohit Mehra 0902it1110450902it111045 RUSTAMJI INSTITUTE OF TECHNOLOGY
  2. 2. ∗ 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 ?
  3. 3. Wireless LANs operate in almost the same way as wired LANs, using the same networking protocols and supporting the most of the same applications. How do wireless LANs work ?
  4. 4. • Point-to-Point • Point-to-Multipoint • Multipoint-to-Multipoint Wireless network design Any wireless network can be thought of as a combination of one or more of these types of connections :
  5. 5. Point to Point The simplest connection is the point-to-point link. These links can be used to extend a network over great distances.
  6. 6. Point to Multipoint When more than one computer communicates with a central point, this is a point-to-multipoint network.
  7. 7. 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)
  8. 8. • Position the Router or Access Point Safely • Create unique password on router • Change default SSID name • Reduce Wireless Signal Range
  9. 9. Disable SSID Broadcast
  10. 10. • Filter Mac Address •Assign Static IP Addresses to Devices • Check Who is Connected to your Network ? • Enable Firewalls On Each Computer & Router
  11. 11. 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 encryption.
  12. 12. • Turn Off the Network During Extended Periods of Non-Use •Upgrade your Router’s firmware
  13. 13. ∗ In 1997, the Institute of Electrical and Electronic Engineers (IEEE) drafted the 802.11 standard for wireless local area networking. ∗ 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
  14. 14. IEEE Wireless Standards Wireless Standard 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 Natively Compatible 802.11b, 802.11g 802.11b, 802.11g 802.11a Potential user Entry level and home networks Larger networks, small business Large business concerned with security
  15. 15. 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. For example, ∗ 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. ADVANTAGES
  16. 16. ∗ 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 bandwidth ∗ 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
  17. 17. ∗ Cost ∗ 2.4 GHz will still has >40% cost advantage ∗ Range At equivalent power, 5 GHz range will be ~50% of 2.4 GHz ∗ Power consumption ∗ Higher data rates and increased signal require more power Disadvantages
  18. 18. ∗ Building-to-building connections ∗ Video, audio conferencing/streaming video, and audio ∗ Large file transfers, such as engineering CAD drawings ∗ Faster Web access and browsing ∗ High worker density or high throughput scenarios ∗ Numerous PCs running graphics-intensive applications Applications
  19. 19. ∗ 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. CONCLUSION
  20. 20. Question & Queries ????...... ………If any