Input, output and processing on devices

Question 1

What is batch processing

Answer 1

Number of transactions are stored up (transaction)
…. Until a specific number collected or a specific time is reached
All transactions processed together
… Go through same process
Transactions may be sorted prior to processing
Same output e.g. electricity Bill
Transactions are achieved (master file)

Question 2

What is Real Time Processing

Answer 2

Process every transaction as it happens
Each process is affected by previous processes e.g. if 2 cinema tickets are sold, the seats become unavailable.
Full processing must be completed otherwise whole transaction is cancelled or rolled back

Question 3

What does ATM stand for and what is its input, output and processes

Answer 3

Automatic Teller Machine
Input : Keypad
Card reader
Screen Buttons
Output : Screen
Printer receipt
Cash dispenser activators
----------------------------------------------------------
Processing*
Pin is compared to pin on card 
The amount is entered
… If not enough = rejected message
… If enough 
- Cash dispensed
- Receipt printed
- Balance updated

Question 4

What does EFTPOS stand for and what is its input, output and processes

Answer 4

Electronic Funds Transfer Point of Sale
Input: Barcode Reader
Keypad + Buttons
Card Reader
Weighing Scales
Output 
Screen
Printer 
Speaker
---------------------------------------------------------
Processing*
Stock Code is sent to server
Database searches for product data
… Returned to POS when found (beep)
Price : Added to running total
Put onto receipt displayed on screen
Description : Displayed on Screen / receipt
Amount input by cashier
Stock level in data base reduced

Question 5

What is the WWW

Answer 5

World Wide Web

Collection of web pages / Information stored and accessed on the internet

Question 6

What is a URL

Answer 6

Uniform Resource Locator
"Structured IP address finder"
Https://www.stcolmans.org.uk
   ^            ^     (            ^            )
Protocol   Service Domain Name 

URL are human friendly,
… easy remember recognise
Computers only recognise IP addresses

Question 7

What is a DNS

Answer 7

Domain Name Server
Provided by ISP
-User types URL into browser
- Passes URL to ISP DNS server
-DNS searches its database
… If finds URL, then it gets the matched IP address
… If not found, it updates itself from TLD DNS server
Then passes IP address to browser
Browser connects web server at IP address

Question 8

What is an IP address

Answer 8

Unique address for every computer on internet
Can be static or dynamic i.e. computer can change IP address
Made up of 4 bytes
… Separated by dots
… Written as decimals
… EG 192.168.1.254

Question 9

What is a web browser

Answer 9

Pieces of software that allows access and display webpages and HTML files

Question 10

What is a Web Server

Answer 10

Computer on Internet
Used to store web pages / Sites
Client users can request web pages to view

Question 11

What is Web Hosting

Answer 11

This is a service company that will store web pages/sites on behalf of clients
Deal with requests to view pages
Maintain Websites etc….

Question 12

What does FTP stand for and explain

Answer 12

File Transfer Protocol
Server Client Model
Client requests files from server
Server transfer files to client
For transferring files over internet

Question 13

What is a Portal

Answer 13

Website that gives access to other services

Eg search engine, News Feed

Question 14

What is Browser/Web cache

Answer 14

Stores recent web pages

… Don’t need to download the same files again if page doesn’t change between visits

Question 15

What is a cookie

Answer 15

Text file
Stores data about your web browser
Websites use them to make relevant recommendations
Target marketing
Criminals can use them to steal data about you