ZyXEL Communications P-312 manual Csu/Dsu Dce, Dhcp

	P312 Broadband Security Gateway
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Countermeasures	Techniques, programs, or other tools that can protect your computer against threats.
Cracker	Another term for hackers. Generally, the term cracker refers specifically to a person
	who maliciously attempts to break encryption, software locks, or network security.
Cracker Tools	Programs used to break into computers. Cracker tools are widely
	distributed on the Internet. They include password crackers, Trojans, viruses, war-
	dialers, and worms.

Cracking

Crossover Ethernet cable

The act of breaking into computers or cracking encryptions.

A cable that wires a pin to its opposite pin, for example, RX+ is wired to TX+. This cable connects two similar devices, for example, two data terminal equipment (DTE) or data communications equipment (DCE) devices.

Cryptoanalysis	The act of analyzing (or breaking into) secure documents or systems that are
	protected with encryption.

CSU/DSU

DCE

Decryption Denial of Service

Channel Service Unit/Data Service Unit. CSUs (channel service units) and DSUs (data service units) are actually two separate devices, but they are used in conjunction and often combined into the same box. The devices are part of the hardware you need to connect computer equipment to digital transmission lines. The Channel Service Unit device connects with the digital communication line and provides a termination for the digital signal. The Data Service Unit device, sometimes called a digital service unit, is the hardware component you need to transmit digital data over the hardware channel. The device converts signals from bridges, routers, and multiplexors into the bipolar digital signals used by the digital lines. Multiplexors mix voice signals and data on the same line.

Data Communications Equipment is typically a modem or other type of communication device. The DCE sits between the DTE (data terminal equipment) and a transmission circuit such as a phone line.

The act of restoring an encrypted file to its original state.

Act of preventing customers, users, clients or other machines from

accessing data on a computer. This is usually accomplished by interrupting or overwhelming the computer with bad or excessive information requests.

DHCP	Dynamic Host Configuration Protocol automatically assigns IP addresses to clients
	when they log on. DHCP centralizes IP address management on central computers
	that run the DHCP server program. DHCP leases addresses for a period of time which
	means that addresses are made available to assign to other systems.

Glossary S