Networks 2

Description

KS4 ICT Mind Map on Networks 2, created by Matthew Stentiford on 25/04/2017.
Matthew Stentiford
Mind Map by Matthew Stentiford, updated more than 1 year ago
Matthew Stentiford
Created by Matthew Stentiford over 7 years ago
10
1

Resource summary

Networks 2
  1. Stand alone and networked computers
    1. Stand alone
      1. Less liable to get hacked
        1. No comms with other computers
          1. Need own printer,scanner,software etc
      2. Networked computer
        1. Needs extra protection, ie firewalls
          1. Potential data sharing
            1. Can share printers, scanners, software etc
      3. EPOS systems
        1. item purchased is Idnetified
          1. data sent to main computer
            1. looks through database to find item details
              1. description and price displayed on screen
                1. after all items are processed total bill is calculated
                  1. receipt is printed
                    1. customer pays with cash or card
        2. Data capture
          1. Barcodes = 13 digits in 4 sections
            1. 2 digits for where the item was made
              1. 5 digits for manufacturer
                1. 5 digits identify the product
                  1. 1 check digit for verification
            2. Advantaged of barcodes TO CUSTOMER
              1. fewer pricing mistakes
                1. faster service
                  1. given itemised recipet that they can check
                2. Disadvantages
                  1. Price not found on the item so they must find the place that it lives or a self scan station
                    1. scratched or crumpled barcodes take longer and could cause queues
                  2. Advantages of barcodes TO SHOP
                    1. No price tags needed
                      1. automatic stock control
                        1. patterns can be analysed
                          1. fraud is minimised by switching price tags
                  1. Optical mark recognition
                    1. detect small marks on paper when scanned
                      1. Used in multiple choice exams and lottery tickets
                        1. Advantages
                          1. Fast method of filling in forms
                            1. fats method of reading forms
                          2. disadvantages
                            1. forms can be large and have too many options
                              1. May be filled in incorrectly and cannot be marked
                          3. Optical character recognition
                            1. reads text and can process it into a word document
                              1. Offers fast input of data
                                1. Poor accuracy (handwritten)
                              2. Machine readable tags
                                1. Some items have scanable tags
                                  1. can be scanned by a machine and update the stock control automatically
                                    1. Advantages
                                      1. Automatic stock control update
                                        1. tags provide a record of daily sales
                                      2. Disadvantages
                                        1. customers may damage tags
                                          1. update at end of day so not always up to date
                                  2. Portable data entry
                                    1. PDET can be carried around and scan items
                                      1. then connected to the computer and updates the stock control
                                        1. can be wirelessly downloaded
                                          1. gather data about eh amount of stock availble
                                            1. log data about items sent away by vans
                                              1. traffic wardens on setting tickets
                                    2. Touch sensitive data entry
                                      1. Input data by touch screen, patients register them selves using them
                                        1. Low level ICT skills needed
                                          1. Little possibility of damage or theft
                                          2. Dirty/scratched can make them hard to use/difficult to read
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