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Internet Protocol Security (IPSec)
A security protocol that provides authentication and encryption over the
internet. Security is provided at the network or packet processing layer of
network communication, rather than the application layer. IPsec supports
two encryption modes - transport and tunnel. Transport mode encrypts
only the data portion of each packet, but leaves the header untouched. The
more secure tunnel mode encrypts both the header and the data portion.
On the receiving side, an IPsec-compliant device decrypts each packet.
ITSP
Short for Internet Telephony Service Provider, which is a general term for
the organization which provides the Internet Telphony service to the
general public
Local Area Network (LAN)
A group of interconnected computer and support devices.
LED
Light emitting diode used for monitoring a device or network condition.
MAC Address
Media Access Control address; the unique physical address of each device's
network interface card
Media Access Control (MAC)
A portion of the networking protocol that governs access to the
transmission medium, facilitating the exchange of data between network
nodes
Modem
Modulator-demodulator, a device that allows computers to communicate
with each other over telephone lines or other delivery systems by changing
digital signals to telephone signals for transmission and then back to digital
signals. Modems come in different speeds: the higher the speed, the faster
the data is transmitted.
Network Address Translation (NAT)
A standard that enables a local-area network (LAN) to use one set of IP
addresses for external traffic and a second set of addresses for internal
traffic.