Created by Adriana Vincelli-Joma
almost 5 years ago
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Question | Answer |
Hardware | -electronic components that input, process, output, and store data according to software |
Hardware categories | -input -processing -output -storage |
Input devices | -attach to computer Examples -mouse -keyboard -touchscreen -microphone -scanner |
Processing devices | -allow for modification, storage, or deletion of data Examples -CPU |
Output devices | -displays results of computer's processing Examples -video display -speakers -printer -projector |
Storage devices | -saves data and programs Examples -magnetic disks (HD) -optical disks (CD and DVD) -flash or solid state device (SSD) |
Central Processing Unit (CPU) | -transfers program/data from disk to main memory -moves instruction from main memory via data channel or bus -performance measured in Hertz -has small amount of very fast memory (cache) |
Main memory | -set of cells in which each cell holds byte of data or instruction -Random Access Memory (RAM) -contains program instructions -contains OS instruction |
Memory swapping | -movement of programs and data into and out of memory |
Volatile memory | -data that will be lost when computer or device is not powered Examples -cache -main memory |
Nonvolatile memory | -memory that preserves data contents even when not powered Examples -magnetic/optical disks |
Software | -instructions for computers |
Types of software | -operating system (OS): controls computer's resources -application programs: perform specific user tasks |
Types of OS | -Windows: developed by Microsoft -Mac OS: developed by Apple -Unix: developed by Bell Labs -Linux: developed by open-source community; version of Unix |
License | -agreement that stipulates how program can be used -users by license use program -ownership remains with development company -open source community has no license fee |
Application software | -programs that perform specific business function -general purpose or specific |
Horizontal-market application software | -provides capabilities across many organizations and industries Examples -Word -Excel -PowerPoint -Acrobat -Photoshop -Paint Shop Pro |
Vertical-market application software | -servers need of specific industry -altered or customized Examples: -appointment scheduling software -inventory tracking system for warehouses |
One-of-a-kind application software | -developed for specific, unique need, usually for particular company's operations Examples -Canada Revenue Agency tax software |
Acquiring application software | -off-the-shelf: commercial software -off-the-shelf with alterations: modified for a particular organization -tailor-made/custom-developed: adapted to particular organization's need |
Browsers | -characteristics of both application software and OS Examples -Internet Explorer -Chrome |
Firmware | -computer software installed into devices -installed into nonvolatile ROM |
Basic Input/Output System (BIOS) | -important piece of firmware used when computer is initially booted up -loads from ROM and runs through commands provided by firmware |
client | -computer that provides word processing, spreadsheets, database access, and usually network connection -connect to servers for Web, emails, database |
server | -provide service Examples -host database -run blog -publish website -sell goods -faster, larger, and more powerful than client -may/may not have video display -server farm: large collection of servers |
Manager's buying decisions | -specify client hardware/software they use -specify client hardware/software for employees -specify horizontal application software or other software appropriate for OS -no role in specifying server hardware other than approving the budget -specify requirements for vertical and custom-server software |
Virus | -computer program that replicates itself -consumes computer resources |
Payload | - program code that causes unwanted activity -deletes programs/data, modify data in ways that are undetected by user |
Macro virus | -attach themselves to various types of documents -when document is opened, virus places itself in startup files of application -infects every file that application creates or processes |
Worm | -virus that propagates using Internet or other network -spread faster than other viruses -specifically programmed to spread -actively use network to spread |
Zombie | -subsequent computers infected with worm or virus |
Botnet | -compromised machine -set of computers/applications that are coordinated through network and used to perform malicious tasks |
Patches | -group of fixes for high-priority failures that can be applied to existing copies of particular product -used to fix security holes in computer programs |
Antivirus program | -software that detects and possibly eliminates viruses |
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