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GLOSSARY
100BASE-FX – 100-Mbps fixed uplink configuration
1000BASE-T – The Gigabit Ethernet standard (1 gigabit is 1000
megabits per second) using four pairs of Category 5 (CAT-5) and
above Unshielded Twisted Pair (UTP) copper cables.
Advanced Encryption Standard (AES) – A new encryption algorithm
that is set to replace the DES algorithm. It uses a secret key of
variable length (128 to 256 bits) to provide symmetric encryption
for data in the IP Security (IPSec) suite of protocols.
Asymmetric Digital Subscriber Line (ADSL) – A technology for
transmitting digital information at high bandwidth on existing
phone lines to homes and businesses. Provides a continuously
available, “always on” connection.
Bridge – Connects one LAN to another using the same protocol.
Cisco IOS Software – The standard operating system used by
all Cisco internetworking solutions. It provides a solution that
is secure, highly resilient, easy to manage, scalable, and flexible,
enabling new technologies to be deployed quickly and without
heavy reinvestment. Cisco IOS Software is the most widely used
internetworking operating system, providing further assurance
of interoperation and reliability
Data Encryption Standard (DES) – A widely used encryption
algorithm that has been used as a default for the last 20 years.
There are two principle key lengths, 56-bit for DES and 168-bit for
Triple DES (3DES). DES is accepted as being unbreakable except by
brute force (trying every key permutation), and is part of the suite
of IPSec protocols.
Demilitarised zone (DMZ) – A computer host or small network
inserted as a “neutral zone” between a company’s private network
and the outside public network. A DMZ prevents direct access to
servers storing company data and provides greater security than a
firewall.
Ethernet – The most widely installed LAN technology. The most
common Ethernet systems are 10BASE-T, providing transmission
speeds of up to 10 Mbps.
Firewall – A security system designed to protect a network against
external threats, such as hackers.
Gigabit – A transfer rate of 1000 Mbps.
Gigabit interface converter (GBIC)
– An optical or copper transceiver
for flexible connections, up to and including gigabit speed, over
different types of media.
IEEE – The Institute of Electrical and Electronics Engineers, notable for
developing national and international standards.
IEEE 802.11 – The formal standard for the wireless networking protocol.
Integrated Services Digital Network (ISDN) – A set of standards for
digital transmission over ordinary telephone copper wire and other
media.
Intranet – A private network created within a business or organization.
Intrusion detection system (IDS) – A security countermeasure that
monitors data traffic and events, looking for signs of intruders.