Wireless
Technologies
Wireless
devices: small enough to easily carry or wear,
have sufficient computing power to
perform productive tasks and can
communicate wirelessly with the Internet and other devices.
The wireless application protocol (WAP)
is the standard that enables wireless
devices to
access Web-based information and services.
WAP-compliant
devices contain microbrowsers, which are Internet browsers with a
small file
size that can work within the confines of
small screen sizes on wireless devices and the
relatively low bandwidths of wireless
networks.
Wireless
Transmission Media
nMicrowave Transmission
nSatellite transmission
nGeostationary
Orbit (GEO)
nMiddle
Earth Orbit (MEO)
nLow
Earth Orbit (LEO)
nGlobal
Positioning System (GPS)
nInternet
Over Satellite (IOS)
Wireless
Computer Networks and Internet Access
Short-range
wireless networks generally
have a range of 100 feet or less.
Medium-range
wireless networks are
the familiar wireless local area networks (WLANs).
The most common type of medium-range
wireless network is Wireless Fidelity (Wi-Fi).
Wide-area
wireless networks connect
users to each other and to the Internet over
geographically dispersed distances.
Mobile
Computing and Mobile Commerce
Mobile
computing: refers to real-time, wireless connection
between a mobile device
and other computing environments, such as
the Internet and an intranet.
Mobility: users carry a mobile device and can
initiate a real-time contact with other systems from wherever they happen to
be.
Broad
reach:users can be reached instantly when they
carry an open mobile device.
Pervasive
Computing
Pervasive
Computing (Ubiquitous computing) is
invisible “everywhere computing” that is
embedded in the objects around us – the
floors, the lights, our cars, washing machine, microwave
Radio
frequency identification (RFID) technology
allows manufacturers to attach tags with antennas and computer chips on goods and then track their movement through radio signals
Wireless
sensor networks (WSNs) are
networks of interconnected, battery-powered, wireless sensors that are placed into the physical environment
Wireless
Security
Rogue
access point: is an unauthorized access point to a
wireless network.
War
driving: is the act of locating WLANs while
driving around a city or elsewhere.
Eavesdropping: refers to efforts by unauthorized users
to try to access data traveling over
wireless networks.
RF
(Radio frequency) jamming: is
when a person or a device intentionally or unintentionally interferes with your wireless network transmissions.
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