Study Guide

Study Guide - C hapter 1 Monitor-display CRT or LCD-images from memory Colors-RGB-colors on screen created by combining diff amounts of primary

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Chapter 1 Monitor -display, CRT or LCD -images from memory Colors -RGB -colors on screen created by combining diff. amounts of primary colors -#FFFFFF is white Pixels -grid of small units -computer draws each pixel in the designated color for the image -more pixels in each row/column is higher resolution -matching resolutions setting for LCD displays -CRT only have max resolution limitation Motherboard -printed circuit board inside processor box-contains most of the circuitry of the PC system -smaller circuit boards (daughter boards or cards) plug into motherboard for added function-video cards -motherboard contains microprocessor chip and memory Microprocessor -“smart” part of the system -performs computing -“micro” not right term-adopted in 1980 Memory -where program and data are located while program runs -RAM (Random Access Memory), retrieved directly (tools in plumbers bag) -Hard Disk (tools in plumbers truck) -volatile memory or “storage”-needs power Hard Disk -high capacity, persistent peripheral storage device -stores programs not in immediate use -made from iron -permanent storage Saving from RAM to Hard Disk -saving moves information from RAM to Hard Disk -RAM is volatile (information is lost when power turns off) Algorithm -precise and systematic method for solving a problem -concept and techniques that programs are based on
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-writing out algorithm steps is programming Chapter 3 Network -2 or more computers connected in a way so they can share data -LAN (Local Area Network) or WAN (Wide Area Network) -LAN connected by Ethernet cord -decentralized scheme-listens for channel is its free -intranet: connects through a gateway, schools, businesses Networks Changing Lives -no where is remote -internet is a complete information resource wherever you are -homes are not remote from work -interconnected -displacement of interpersonal relationships -English is universal language -freedom of speech IP Address -each computer is connected to the internet, is given a unique numerical address Domain Names-human readable symbolic names Domain Name Systems -translates human readable names to IP Addresses -when you use a domain name, computer asks DNS to look up IP Address -if it doesn’t know, asks roots name server Protocol -how the information is actually sent -TCP/IP: Transmission Control Protocol 1. information is broken into sequence of small fixed units called IP packets 2. packet has destination IP address and sequence number 3. packet sent over internet one at a time Connecting to Internet -ISP: internet service provider, sell connections, like AOL -users plugs into phones -home—ISP—Internet
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Web Servers -computers programmed to send files to browsers running on other computers connected to the internet -web servers and their files = WWW Requesting a Web Page -web requests creates client/server interaction -URL: universal resource locator 1. Protocol-http:// -hypertext transfer protocol -tells computer how to handle file 2. Server computes name -IP Address given by domain hierarchy
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This document was uploaded on 01/10/2011.

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Study Guide - C hapter 1 Monitor-display CRT or LCD-images from memory Colors-RGB-colors on screen created by combining diff amounts of primary

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