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has been deployed widely to implement Virtual Private Networks (VPNs).
IPsec supports two encryption modes: Transport and Tunnel. Transport mode encrypts only the data portion
(payload) of each packet, but leaves the header untouched. The more secure Tunnel mode encrypts both the
header and the payload. On the receiving side, an IPSec-compliant device decrypts each packet.
For IPsec to work, the sending and receiving devices must share a public key. This is accomplished through a
protocol known as Internet Security Association and Key Management Protocol/Oakley (ISAKMP/Oakley), which
allows the receiver to obtain a public key and authenticate the sender using digital certificates.
ISDN
Integrated Services Digital Network. A type of broadband Internet connection that provides digital service from the
customer's premises to the dial-up telephone network. ISDN uses standard POTS copper wiring to deliver voice,
data or video.
ISP
Internet Service Provider. A company that provides access to the Internet.
LAN
Local Area Network. 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.
LDAP
Lightweight Directory Access Protocol. A set of protocols for accessing information directories. LDAP is based on
the standards contained within the X.500 standard, but is significantly simpler. And unlike X.500, LDAP supports
TCP/IP, which is necessary for any type of Internet access. Because it's a simpler version of X.500, LDAP is
sometimes called X.500-lite.
Although not yet widely implemented, LDAP should eventually make it possible for almost any application running
on virtually any computer platform to obtain directory information, such as email addresses and public keys.
Because LDAP is an open protocol, applications need not worry about the type of server hosting the directory.
Local User
A user that has signed up for an account from a specific ezboard community, enabling the user to participate only in
that ezboard as a registered user. Global user registration from the ezboard home page is recommended for full
access to all ezboard communities and the Control Center.
MAC
Media Access Control. Every wireless 802.11 device has its own specific MAC address hard-coded into it. This
unique identifier can be used to provide security for wireless networks. When a network uses a MAC table, only the
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