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REQUENTLY
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SKED
Q
UESTIONS
o
A local area network that transmits over the air typically
in an unlicensed frequency such as the 2.4GHz band.
A wireless LAN does not require lining up devices for line
of sight transmission like IrDA. Wireless access points
(base stations) are connected to an Ethernet hub or server
and transmit a radio frequency over an area of several
hundred to a thousand feet which can penetrate walls and
other non-metal barriers. Roaming users can be handed
off from one access point to another like a cellular phone
system. Laptops use wireless network cards that plug into
an existing PCMCIA slot or that are self contained on PC
cards, while stand-alone desktops and servers use plug-in
cards (ISA, PCI, etc.).
o
An AD-HOC network is a peer to peer network where all
the nodes are wireless clients. As an example, two PC's
with wireless adapters can communicate with each other
as long as they are within range. A wireless extension
point can extend the range of an AD-HOC network.
o
A family of IEEE standards for wireless LANs first introduced
in 1997. 802.11 provides 1 or 2 Mbps transmission in the
2.4GHz band using either a frequency hopping modulation
•
What is a Wireless LAN?
•
What is AD-HOC?
•
What is the 802.11 standard?
