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  1. 1. Wi-Fi Is it good? Does it work? Trinidad Salas
  2. 2. What is Wi-Fi <ul><li>Wi-Fi is short for wireless fidelity. It refers to a local area network which uses high frequency radio signals to send and receive data over short distances. </li></ul><ul><li>A wireless network uses radio waves, just like cell phones, televisions and radios do. In fact, communication across a wireless network is a lot like two-way radio communication. Here's what happens </li></ul>
  3. 3. History of Wi-Fi <ul><li>Wi-Fi was invented in 1991. </li></ul><ul><li>Wi-Fi was invented by NCR Corporation/AT&T. </li></ul><ul><li>Vic Hayes is known as the father of Wi-Fi for his invention While working for Agere systems . </li></ul><ul><li>Agere Systems suffered from strong competition soon after Vic quit. </li></ul><ul><li>Agere systems quit the market in the late 2004 </li></ul>
  4. 4. How Wi-Fi works <ul><li>A computer's wireless adapter </li></ul><ul><li>translates data into a radio </li></ul><ul><li>signal and transmits it using an </li></ul><ul><li>antenna. </li></ul><ul><li>A wireless router receives the signal and decodes it. It sends the information to the Internet using a physical, wired Ethernet connection. </li></ul>
  5. 5. WIFI security <ul><li>Security is your personal decision, but having a wireless connection we should pay attention to protect our private files and encrypt sent messages. Actually, the security modules were very important since the beginning of the Wi-Fi projection. In order to prevent intercepting your data by the others the designers implemented many security techniques, like Wi-Fi Protected Access (based on encryption), Virtual Private Network (making virtual &quot;tunnels&quot;), Media Access Control Filtering (rejecting unknown MAC addresses), RADIUS Authentication and Authorization (using login and password) or Kerberos (key distribution). There is also a possibility to combine some of these security mechanisms making your transmissions even more secure. </li></ul>
  6. 6. Advantages of Wi-Fi <ul><li>Absence of wires. The network is based on wireless Wi-Fi technology which does not require using the telephone or any other lines of connection based on wires. </li></ul><ul><li>New horizons. First of all is mobility. You are not tied up to your working place any more still having connection with based, e-mail, colleagues and friends. </li></ul><ul><li>Possibility of some mobility. Since you are not tied up to wires, you can easily change location of your computer not worrying about connection withdrawal (in the cover area of access point). </li></ul><ul><li>High-speed access to internet. A high-speed access to internet is offered for network subscribers, speed of channel is 108Mbit/sec. Meanwhile, there is no necessity for ringing up or connection defining, etc. You are always on-line and to be connected to internet it is just enough to open your browser. </li></ul><ul><li>Any kind of intranet information exchange. Your intranet communication is no how limited and you can send any files, communicate in chat, play network games, etc. </li></ul>
  7. 7. Disadvantages of Wi-Fi <ul><li>The disadvantages of Wi-Fi® Interference. Because your Wi-Fi equipment uses radio waves (probably in the 2.4 GHz frequency band), it can be vulnerable to interference from household devices like microwaves and cordless phones. Your neighbor's wireless network can also be a source of interference. </li></ul><ul><li>Updating your older computer. If your computer isn't equipped for Wi-Fi, you will have to buy and install a Wi-Fi card that's compatible with your PC. Or, if your computer has an older 802.11b card, you may want to update it to work with your faster 802.11g network. In either case, you can expect to spend up to $100 for a new card. </li></ul><ul><li>Privacy concerns. You may be wondering whether information you transmit from your laptop wirelessly can be intercepted. That's possible, and it's also possible for hackers to use your access point to connect to the Internet. </li></ul>
  8. 8. Where to Find Wi-Fi <ul><li>If you've been in an airport, coffee shop, library or hotel recently, chances are you've been right in the middle of a wireless network. Many people also use wireless networking, also called Wi-Fi or 802.11 networking, to connect their computers at home, and an increasing number of cities use the technology to provide free or low-cost Internet access to residents. In the near future, wireless networking may become so widespread that you can access the Internet just about anywhere at any time, without using wires. </li></ul>
  9. 9. Protection in hotspots <ul><li>Public hot spots do not normally have any security in place. It is your responsibility to have a firewall installed on your laptop or use a VPN when connecting to your office network. You should make sure that you have disabled file sharing on your mobile gear before connecting to a Wi-Fi network in a public place. Failure to do so can allow someone else on the network access to your files. </li></ul>
  10. 10. Citations <ul><li>http://mobileoffice.about.com/cs/findinghotspots/f/usehotspot.htm </li></ul><ul><li>http://computer.howstuffworks.com/wireless-network1.htm </li></ul><ul><li>http://www.wilcorpinc.com/wifi_history.htm </li></ul><ul><li>http://mobileoffice.about.com/od/findingusinghotspots/tp/hotspotquestion.htm </li></ul>