(n.) A switch that also performs routing operations. Usually a switch operates at layer 2 (the Data Link layer) of the OSI Reference Model while routers operate at layer 3 (the Network layer). Routing switches, however, perform many of the layer 3 functions usually reserved for routers. And because the routing is implemented in hardware rather than software, it is faster. The downside of routing switches is that they are not as powerful or as flexible as full-fledged routers.
Because they perform some layer 3 functions, routing switches are sometimes called layer-3 switches.
See a breakdown of the seven OSI layers in the Quick Reference section of
- row address strobe
Abbreviated RAS, a signal, or strobe, sent by the processor to a DRAM circuit to activate a row address. DRAM stores data in a series of rows and columns, similar in theory to a spreadsheet, and each cell where a data bit is stored exists in both a row and a column. A processor uses […]
(1) In word processing and desktop publishing, a straight line that separates columns of text or illustrations. (2) In expert systems, a conditional statement that tells the system how to react to a particular situation.
In word processing, a line running across the display screen. It measures the page layout in points, picas, inches, or centimeters. It is sometimes called the ruler line and is particularly useful for setting margins and tabs. Sophisticated desktop publishing systems and page layout programs sometimes support movable rulers that you can move around the […]
(1) To execute a program. (2) To operate. For example, a device that is running is one that is turned on and operating properly.
- run book
In computer systems and networks a run book is a set of defined procedures developed by the administrator or IT professional for maintaining the everyday routine, as well as the exceptional operations of the computer system or network. The run book should contain all the information a staff would need to perform daily operations as […]