WJEC A-Level Computer Science Revision Questions and Answers

A Network of Networks. Internet A process or set of rules to be followed to solve a given problem. Algorithm A collection of related records. File A collection of related fields. Record Is an Internet standard for electronic mail transmission. SMTP Is an Internet standard protocol used by e-mail clients to retrieve e-mail messages from a mail server over a TCP/IP connection. IMAP When the user is un able to edit/alter the file. Read Only The process of moving a file from Main Storage to another location for inactive use. Archive File is only used by the Operating System such as Drivers. System When the user in unable to see the file. Hidden The process of which two devices establish their readiness to communicate. Hand Shaking The method of combining several independent data sources and sending them down the same route to a single destination. Multiplexing A computer language that consists of easily understood names, keywords or tags that help format the overall view of a page and the data it contains. Mark Up Language A data compression algorithm that allows the original data to be perfectly reconstructed from the compressed data. Lossless A data compression algorithm that doesn't allow the original data to be reconstructed. The aim is to eliminate redundant/unwanted data. Lossy