Overview of WiFI
   

Wi-Fi

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Wi-Fi, popularly known as an acronym for wireless fidelity (see below for origin), was originally a brand licensed by the Wi-Fi Alliance to describe the embedded technology of wireless local area networks (WLAN) based on the IEEE 802.11 specifications. Use of the term has now broadened to generically describe the wireless interface of mobile computing devices, such as laptops in LANs. Wi-Fi is now increasingly used for more services, including Internet and VoIP phone access, gaming, and basic connectivity of consumer electronics such as televisions, DVD players, and digital cameras. More standards are in development that will allow Wi-Fi to be used by cars on highways in support of an Intelligent Transportation System to increase safety, gather statistics, and enable mobile commerce (see IEEE 802.11p). Wi-Fi and the Wi-Fi CERTIFIED logo are registered trademarks of the Wi-Fi Alliance - the trade organization that tests and certifies equipment compliance with the 802.11x standards.

The five-layer TCP/IP model
5. Application layer
DHCP DNS FTP Gopher HTTP IMAP4 IRC NNTP XMPP MIME POP3 SIP SMTP SNMP SSH TELNET RPC RTP RTCP TLS/SSL SDP SOAP
4. Transport layer
TCP UDP DCCP SCTP RSVP GTP
3. Internet layer
IP (IPv4 IPv5 IPv6) • IGMP ICMP BGP RIP OSPF ISIS IPsec ARP RARP
2. Data link layer
802.11 ATM DTM Ethernet FDDI Frame Relay GPRS EVDO HSPA HDLC PPP L2TP PPTP
1. Physical layer
Ethernet physical layer ISDN Modems PLC SONET/SDH G.709

 

Confusion with piggybacking

Legality

Ethical considerations

Wireless network security

Overview

Uses

Technical Information

Devices

Social Concerns