class 4 - it infrastructure Flashcards
What is a computer?
It accepts input (raw data: mouse, keyboard), then it processes data in the PC, then it produces output (information) usually thru a monitor.
What is inside the PC?
CPU, motherboard, storage, DVD, Flash, Card readers,
Monitor, printer, speakers.
Screen, keyboard, mouse/touchpad, camera microphone
Tablets and mobile computers compared to PC?
small computing devices that work the same as large PCs. All components are integrated into one.
Evolution of IT Infrastructure (how to connect devices together)?
Many firms found it hard to integrate all of their Local Area Networks (LAN)
The problems are created by closed systems and are being solved by tech items such as TCP/IP (internet protocol) for communication.
They also need software such as ERP to link all separate applications together.
The goal is to deliver information painlessly and with no problem.
Evolution of IT Infrastructure (Cloud Computing such as google, microsoft, ibm)
Model of computing relies on big computing centers such as google microsoft, ibm
Those companies run servers to allow our computers to work especially using those company applications (windows system, google chrome)
Networking Personal Computers
LAN - Local Area Network.
Links many PC together.
Shared access to data, printers, and other devices.
WAN - Wide Area Network
Internet
Email
Web browsing.
Hardware
Electronic components are used to input, process, output, and store data.
Includes:
Input, Processing, Output, Storage
Computer Data
Binary Digits (bits)
used to represent data
represented in 0 or 1
Bytes
Bits grouped in 8-bit chunks
K - 1024 bytes, MB 1024 k, GB 1024 MB, TB 1024 GB
Data Hierarchy
Bit - Byte - Field - Record - File - Database
How does a computer work?
Motherboard (mainboard).
Electric circuit that connects computer hardware together (cpu, gpu, hdd)
CPU
Transfers program or data from a disk to main memory.
Moves instruction from main memory via data channel or bus.
Primary Storage
Random Access Memory (RAM)
Volatile (goes away when pc is turned off)
Working memory like a blackboard
Contains running program instructions
Contains running Operation System (OS) instructions
Read only Memory (ROM)
Non-volatile (stays when power is off)
Used to boot-up the machine
Flash Memory
Flash memory device: very small storage plugs into a USB port
Flash memory card: high-capacity storage card that is inserted into a reader which it turns into a USB port
Secondary Storage - Fixed Disks
Fixed Disk Drives (Mechanical Hard Drives)
Capacity is measured in bytes - GB (Gigabytes)
Common storage size 1000GB - 8000GB (8TB)
Solid State Hard Drives (SSD)
Uses flash memory for storage
Very fast but expensive
Client and Server
client computers are used to review and process info. (database access, word processing)
Servers provide access to information and application (database)
