Please enable JavaScript.

Coggle requires JavaScript to display documents.

Computers (Network - two or more computers connected (Terms (Bandwidth…

- - - - Hard Disks
        
        Terabytes of storage
      - Tape
        
        lowest storage
      - Floppy Disks
        
        1.44 MB maximum storage
    - - Storing Data
        
        Stores data as magnetized dots or areas.
      - Details
  - - - Cloud Storage is the internet service providing storage across the server
      - Details
        
        :checkered_flag: Access files from any computer
        :checkered_flag: Store large files instantaneously
        :checkered_flag: Allow others to access their files
        :checkered_flag: View time-critical data and images immediately
        :checkered_flag: Store offsite backups
        :checkered_flag: Provide data center functions
  - - - Storing Data
        
        Stores data as a number of data dots that read by and made with lasers.
      - Details
        
        :checkered_flag: Direct Access
        :checkered_flag: Inexpensive relatively
    - - CD
        
        R
        
        Recordable, after recording, you can only read.
        
        700 MB
        
        RW
        
        You can rewrite any amount times
        
        700 MB
        
        ROM
        
        Read only
        
        800 MB
      - DVD
        
        R
        
        :star: Record once :star: 4.7GB
        
        RW
        
        :star: Rewrite-able anytime :star: 4.7 GB
        
        ROM
        
        :star: Read Only :star: 4.7 GB
      - Blueray
  - - - SSD
        
        :star: internal :star: Fast :star: Stores a lot of data
      - Flash Memory Cards
        
        :star: Small :star: Portable :star: Versatile
      - Sticks
        
        :star: external :star: small, portable :star: Quick Data transfer rate :star: Cheap
      - MicroFlash Memory Cards
        
        :star: Small (Easily lost) :star: Portable :star: Versatile
    - - :checkered_flag: Silent
        :checkered_flag: No moving parts
        :checkered_flag: Less energy Usuage
        :checkered_flag: Less heat emitted
      - Electrical transistors conducting or not conducting an electircal signal determines if the byte is all zeros or ones.
  - - - Direct
        
        :!: Modern Technology
        :silhouette: Random Access
        :checkered_flag: The computer calculates exactly where the data is stored and goes right to it.
        
        Used on - Everything except old tech.
      - Serial
        
        :silhouettes: Sequential Access
        :checkered_flag: The data is searched through in order until the required data is found.
        
        Used on - Old Magnetic Tapes, Cassettes
    - - Storage Device
        
        The device reads the data being stored.
      - Backup
        
        Backing up data means to save your data in a distant place so that you won't lose your data someday.
      - Data Storage
        
        Data storage is putting data in a known place to come back to it later.
      - Reading
        
        Reading data means getting the stored data back
      - Writing
        
        Writing data means storing it
      - Storage Media
        
        The media is where the data is stored.
- - - - Database
        
        :checkered_flag: Security for Databases
        :checkered_flag: Updates to databases
      - File
        
        :checkered_flag: Stores large files :checkered_flag: Makes backups :checkered_flag: Controls Security
      - Web
        
        :checkered_flag: Satisfies Client Request on WWW
      - Mail
        
        :checkered_flag: Stores and forwards mails :checkered_flag: SMTP (send) & POP (receive)
      - Print
        
        :checkered_flag: Manages queue for printing
        :checkered_flag: Controls access to printers
      - Application
        
        :checkered_flag: Installs, Updates, Control programs
        :checkered_flag: Both basic and specialized applications
    - - FTP
        
        File Transfer Protocol
        
        Transfers file between two computers using the internet and servers.
      - DNS
        
        Domain Name Server
        
        The Internet Phone Book
        
        Names a bunch of numbers so that the websites are easier to remember. Subdomains can also exist within the domain.
  - - - Make sure no one physically access your computer
    - - Use strong usernames and passwords
      - Using firewalls
      - Encrypting your data
        
        Symmetrical Encryption - one public key
        
        Asymmetrical Encryption - one public key and one private key
  - - - Most used in networks due to security and bandwidth.
    - - Connects computer to make LAN
      - Switch
        
        The "smarter' counterpart of Hub - sends data to only addressed
    - - Any computer that wants to be connected, needs a Network Interface Card
    - - Connects networks - LAN --> WAN
      - Wireless Router
        
        A wireless switch and a router combined.
  - - - Uses a trunk or backbone to which all of the computers on the network connect.
    - - Data travels in circular fashion from one computer to another on the network.
    - - All computers connect to a central device called hub or switch.
    - - Each computer connects to every other.
    - - No physical cabling - just radio waves
  - - - :silhouette: Personal Area Network
        :star: Network between users near each other.
    - - :silhouette: Local Area Network
        :star: Network within a limited area
    - - :silhouette: Metropolitan Area Network
        :star: Network within a certain region
    - - :silhouette: Wide Area Network
        :star: Internet
  - - - The rate of data being transmitted over time
      - Bits per second
    - - :silhouette: Internet Service Provider
      - Provides access to internet
    - - :silhouette: Public Switched Telephone Network
      - :checkered_flag: Low bandwidth
        :checkered_flag: Dial Up Connection
    - - :silhouette: Integrated Services Digital Network
      - :checkered_flag: Dial Up Connection
        :checkered_flag: Middle Speed bandwidth
    - - :silhouettes: Broadband/Asymmetric Digital Subscriber Line
      - :checkered_flag: Always On
        :checkered_flag: High bandwidth
    - - converts signals from computer so it can travel
        along communications line to ISP
    - - Internet Service Provider.
        
        Browser Software.
        
        Telecommunications line e.g. ISDN, ADSL.
        
        Modem/Broadband Modem/ISDN adapter.
- - - - Volatile or Temporary memory
      - The more RAM you have, the faster your computer is
    - - Allocates power and communications throughout the hardware of the computer
    - - Brain of computer
      - Circuitry in your computer that calculates out the instructions
    - - AKA GPU
      - Generates visual images to output on monitor.
    - - Storage store information for later use.
    - - Produces sound that can be heard through the speakers or headphones.
    - - Connects your computer to the LAN or the internet.
    - - Even after shutdown, keeps your clocks and other information are kept to date.
    - - Gives power to your computer
  - - - Gives information into the computer
      - Examples
        
        Keyboard
        
        Mouse
        
        Microphone
        
        Scanner
        
        Webcam
    - - Outputs the information from the computer to the user.
      - Examples
        
        Monitor
        
        Speaker
        
        Printer
- - - - Accepts input information
      - Sends output information
      - Recognise peripheral devices
      - Manages the data
      - Allows applications
      - Shares system memory
      - Runs applications
      - System security
      - Troubleshoots system problems
      - Manages the moving of data
    - - GUI (Graphical User Interace)
        
        Visual Interfaces
        
        Easier to use
        
        More computer power required
        
        Terms
        
        Icons
        
        Symbols or small images
        
        Menus
        
        Allows users to select functions
        
        Pointers
        
        Little arrows users control
        
        Windows
        
        Separate areas of the screen
      - CLI (command line interface)
        
        Uses over 270 precise commands
        
        Uses little power
        
        Hard to use since you have to remember
      - Touchscreen Interface
        
        Mainly used in portable devices
        
        Use fingers to select icons and commands from the screen
        
        Functions
        
        Rotating
        
        Using your two fingers to turn around to rotate an object.
        
        Swiping
        
        Swiping your finger across the screen to scroll through a document or window
        
        Pinching
        
        Brings your finger together to zoom in