Online World

Online World

1. CONNECTION TO THE INTERNET

   • A computer- electronic device which is capable of receiving data
   • ISP- provides access to the internet
   • Modem- device or program that enables a computer to transmit data over
   • broadband- high bandwidth connection to the internet

2. INTERENT PREVENTION

   • Physical barriers- this includes turning off computers and locking offices
   • password control of access- password sequence of numbers
   • anti-virus software- software that can isolate the virus
     • firewall
     • encryption
     • backup and recovery

3. DATA EXCHANGE

   • SIMPLEX- sends data in one direction only, radio broadcast
   • half-duplex- allows two way transmissions, walkie talkie
   • coder/decoder- program that is used to encode and/or decode binary data
   • duplex- a communication system, allowing transmission of two signals in opposite dierctions-mobile

4. NETWORKS

   • parallel transmission- a number of bits of data that are transmitted over number of wires
     • SERIAL TRANSMISSION- BITS THAT ARE TRANSMITTED ONE TIME AT OVER A SINGLE WIRE
       • bi-directional transmission- transmits in both directions