EXAM RETAKE: Glossary "R"

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RADIUS (Remote Authentication Dial-in User Service)

Used to manage remote and wireless authentication infrastructure.
Users supply authentication information to RADIUS client devices, such as wireless access points. The client device then passes the authentication data to an AAA (Authentication, Authorization, and Accounting) server, which processes the request.

RAID (Redundant Array of Independent/ Inexpensive Disks)

A set of vendor-independent specifications for fault-tolerant configurations on multiple-disk systems.

rapid elasticity

The ability to scale cloud computing resources quickly to meet peak demand and just as quickly remove resources if they are not currently needed.

RDPRA (Remote Desktop Restricted Admin) Mode

A method of mitigating the risk of using Remote Desktop.

resource pooling

A cloud provider's data center hardware is not dedicated or reserved for a particular customer account, allowing the provider to provision more resources through management software rather than physically altering hardware to allocate or deallocate resources for a customer.

RFID (Radio Frequency Identification)

A chip allowing data to be read wirelessly. RFID tags are used in barcodes and smart cards.

RIP (Raster Image Processing)

The component responsible for converting instructions in the Page Description Language (PDL) to instructions that control the print engine (an inkjet's ink dispersion nozzles or a laser printer's developer laser, for instance). A PDL might contain instructions for printing vector graphics and fonts; the RIP translates these instructions into a pattern of dots (raster) at the required resolution.

rooting

Gaining privileged level or root level access to an Android device to enable modifying code or installing software not intended for the device.

router

A network device that links dissimilar networks and can support multiple alternate paths between locations based upon the parameters of speed, traffic loads, and cost. A router works at layer 3 (Network) of the OSI model. Routers form the basic connections of the Internet. They allow data to take multiple paths to reach a destination (reducing the likelihood of transmission failure). Routers can access source and destination addresses within packets and can keep track of multiple active paths within a given source and destination network. TCP/IP routers on a LAN can also be used to divide the network into logical subnets.

RS-232

A serial port that uses a 25-pin male D connector. (See also serial port).