Unit 1

Unit 1

1. Protocols

   • Transmission control protocol (TCP)
     • maintain a network conversation through application programs
   • Internet Protocol (IP)
     • a set of rules dictate how data should be delivered over a public network.
   • User datagram protocol (UDP)
     • the exchange of messages between computing devices in a network
   • Simple Mail Transfer Protocol (SMTP)
     • sending a e-mail over the internet

2. Units of Measure

   • Computers are powered by electricity which is either ‘on’ or ‘off’. This is represented as either a ‘1’ or ‘0’. Each one or zero is called a bit which is short for binary digit.
   • kb kilobyte
     • 10p3 = 1000
     • MB megabyte
       • 10p6 = 1000000
       • GB Gigabyte
         • 10p9 = 1000000000
         • TB Terabyte
           • 10p12 =1,000,000,000,000
           • PB Petabyte
             • 10p15
               • 1,000,000,000,000,000,