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filter - Generally this is a process or device that screens network traffic for
characteristics such as source address, destination address, or protocol, and
determines whether to forward or block traffic based on the criteria that you have
programmed.
firewall - This IP filtering security software can render parts of the LAN
inaccessible and invisible to the public. It prevents unauthorized and/or
unrecognized access.
frame - This usually refers to headers and trailers used for synchronization and error
control. The terms cell, datagram, message, packet, and segment are also used to
describe logical information groupings at various layers of the OSI reference model.
GUI - Graphical User Interface refers to a user-friendly screen where icons, menus,
and simple language are used to operate a computer. It does not require the user to be
familiar with DOS or UNIX commands.
hub - A hub is hardware that contains independent, but connected network devices.
Hubs can repeat signals or merely split signals sent through them.
IP - Internet Protocol, a network layer protocol in the TCP/IP stack that provides
features for addressing, type-of-service specification, fragmentation and reassembly,
and security.
IP address - Any computing device that uses the Internet must be assigned an
Internet or IP address. This 32-bit number is written in 4 decimal fields or “octets”
separated by periods, e.g., 192.9.200.1.
IPSec - IP Security is a Layer 3 protocol that
supports the creation of a VPN over the
Internet. Its core components are: an authentication header (AH) to verify the user’s
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