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L i f e B o o k S S e r i e s - A p p e n d i x

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Wireless LAN Glossary

Ad hoc
A designation for wireless LAN network
configuration. It indicates a form of
communication limited to those personal
computers which have wireless LAN function. For
details, refer to “Ad hoc connection” on page 96.

Channel
The frequency band of wireless LAN to be used
in communications over wireless LAN or at the
access point.

DHCP (Dynamic Host Configuration
Protocol)
A protocol used for automatically fetching
communication parameters such as IP
addresses. The side which assigns IP address
is called DHCP server and the side that is
assigned it is called DHCP client.

DNS (Domain Name System)
A function that controls the correspondence of
IP addresses assigned to a computer with the
name. Even for those computers whose IP
addresses are unknown, if their names are
known, it is possible to communicate with them.

IEEE802.11a
One of the wireless LAN standards prescribed
by the 802 committee in charge of establishing
standards of LAN technology in IEEE (Institute
of Electrical and Electronic Engineers). It allows
communications at the maximum speed of 54
Mbps by using a 5GHz band which can freely be
used without radio communication license.

IEEE802.11b
One of the wireless LAN standards prescribed
by 802 committee in charge of establishing
standards of LAN technology in IEEE (Institute
of Electrical and Electronic Engineers). It allows
communications at the maximum speed of
11Mbps by a band of 2.4 GHz (ISM band) which
can freely be used without radio communication
license.

Infrastructure
A designation of Wireless LAN network
configurations. It indicates a form of
communication using an Access Point.

IP address
An address used by computers for
communicating in TCP/IP environment. IP
addresses have global and private addresses. A
global address is a unique address in the world.
A private address is a unique address within a
closed network.

LAN (Local Area Network)
An environment connecting computers within a
relatively small range, such as the same floor
and building.

MAC address (Media Access Control
Address)
A physical address inherent to a network card.
For Ethernet, the top three bytes are controlled/
assigned as a vendor code. The remaining three
bytes comprise the code uniquely (to avoid
duplication) controlled by each vendor. As a
result, there is no Ethernet card with the same
physical address in the world. In Ethernet, the
frame transmission/reception is performed based
on this address.

MTU (Maximum Transmission Unit)
The maximum size of data which can be
transmitted at one time in networks including the
Internet. In an environment whose maximum size
of data is too large to correctly receive data,
normal communications can be restored by
setting the size of MTU to a smaller value.

Network authentication
The method of authentication performed by
wireless LAN clients to connect with the access
point. There are two types: open system
authentication and shared key authentication.
The type of authentication must be set to each
client and also coincide with the setting of access
point with which to communicate. Network
authentication is sometimes called authentication
mode.

LB_GARLICS 09 (106-116)

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