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Infrastructure mode
An old term used to describe a wireless network consisting of devices connected to a network using a
centralized wireless access point. One of two types of wireless network modes; the other is a
device-to-device network (also known as peer-to-peer or ad hoc mode).
IP Address
Every PC on the Internet has a fixed identifying number, called a IP Address. A typical IP address looks like
this: 216.27.61.137
LAN
A system of connecting PCs and other devices within the same physical proximity for sharing resources
such as an Internet connections, printers, files and drives. When Wi-Fi is used to connect the devices, the
system is known as a wireless LAN or WLAN.
MAC Address
On a local area network (LAN) or other network, the MAC (Media Access Control) address is your
computer’s fixed hardware number.Usually written as: 01:23:45:67:89:ab
Ping (Packet Internet Groper)
A utility to determine whether a specific IP address is accessible. It works by sending a packet to the
specified address and waiting for a reply. PING is used primarily to troubleshoot Internet connections.
RADIUS
Remote Access Dial-Up User Service. A standard technology used by many major corporations to protect
access to wireless networks. RADIUS is a user name and password scheme that enables only approved
users to access the network; it does not affect or encrypt data. The first time a user wants access to the
network, secure files or net locations, he or she must input his or her name and password and submit it over
the network to the RADIUS server. The server then verifies that the individual has an account and, if so,
ensures that the person uses the correct password before she or he can get on the network. RADIUS can
be set up to provide different access levels or classes of access. For example, one level can provide
blanket access to the Internet; another can provide access to the Internet as well as to e-mail
communications; yet another account class can provide access to the Net, email and the secure business
file server. Like other sophisticated security technologies, RADIUS comes in a variety of types and levels.
RJ-45
Standard connectors used in Ethernet networks. They appear similar to standard RJ-11 telephone
connectors. However, RJ-45 connectors can have up to eight wires, whereas telephone connectors have
only four.
Roaming
The ability to move seamlessly from one area of Wi-Fi or cellular phone coverage to another with no loss in
connectivity. Roaming also refers to the ability of road warriors to wirelessly connect to the Internet from
different hotspots without confronting the array of schemes used by different providers to authorize use and
track billing. Roaming agreements among providers allow mobile professionals to a single authentication
and authorization scheme to have all charges resolved to a single bill.
Router
A device that forwards data packets along networks. A router is connected to at least two networks,
commonly two LANs or WANs or a LAN and its ISP network. Routers are located at gateways, the places
where two or more networks connect.
Server
A computer that provides resources or services to other computers and devices on a network. Types of
servers can include print servers, Internet servers, mail servers, and DHCP servers. A server can also be
combined with a hub or router.
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