TITRE1=WHAT IS WI-FI ? &CHAPITRE1_1=Introduction : wireless networks &CHAPITRE1_2=Wi-Fi : equipment and standard &CHAPITRE1_3=From a wired network to a wireless one &TITRE2=THE WIRELESS LOCAL NETWORK IN THE COMPANY &CHAPITRE2_1=Deployment &CHAPITRE2_2=Ad hoc and infrastructure modes &CHAPITRE2_3=Advantages and constraints &TITRE3=WI-FI AT HOME &CHAPITRE3_1=Set-up &CHAPITRE3_2=The role of the Wi-Fi terminal &CHAPITRE3_3=The possibility of installing Wi-Fi &CHAPITRE3_4=Securing the Wi-Fi network &TITRE4=PUBLIC WI-FI &CHAPITRE4_1=What is a Hotspot? &CHAPITRE4_2=Access point to Internet and specific services &TITRE5=CONCLUSION : A COMPARISON OF THROUGHPUTS AND RANGES