Refers to connecting a device to a network via a modem and a public telephone network. Dial-up access is really just like a phone connection, except that the parties at the two ends are computer devices rather than people. Because dial-up access uses normal telephone lines, the quality of the connection is not always good and data rates are limited. In the past, the maximum data rate with dial-up access was 56 Kbps (56,000 bits per second), but new technologies such as ISDN are providing faster rates.
An alternative way to connect two computers is through a leased line, which is a permanent connection between two devices. Leased lines provide faster throughputand better quality connections, but they are also more expensive.
A program that is often used to maliciously redirect Internet connections. When used in a malicious way, it disconnects the legitimate telephone connection used to connect to the Internet and re-connects via a premium rate number (1-900 numbers). Often, the first indication a user has of this activity is an extremely expensive phone bill, as […]
- Dialog Box
)A box that appears on a display screen to present information or request input. Typically, dialog boxes are temporary — they disappear once you have entered the requested information. In the Macintosh and Microsoft Windows interfaces, there is a convention that any menu option followed by ellipsis points (… ) will, when selected, bring up […]
- dictionary attack
(n.) (1) A method used to break security systems, specifically password-based security systems, in which the attacker systematically tests all possible passwords beginning with words that have a higher possibility of being used, such as names and places. The word “dictionary” refers to the attacker exhausting all of the words in a dictionary in an […]
(plural dies or dice) A square of silicon that contains an integrated circuit. Die often is used synonymously with chip.
(adj.) Refers to a material that is a poor conductor of electricity. Dielectric materials can be made to hold an electrostatic charge while dissipating minimal energy in the form of heat. Glass, porcelain, mica, rubber, plastics dry air, vacuums and some liquids and gases are dielectric.