Protocols

Protocols

1. They are needed to ensure that data is sent and received accurately.

2. It ensures that data is sent to the correct address on a network.

3. They have to include:

   • DATA FORMATS: Ensures data can be exchanged consistently and correctly.
   • ADDRESS FORMATS: Identify senders and recipients and to ensure that data goes to the right places
   • ROUTING: provides to right information so that data can flow through networks correctly.

4. TCP/IP: Transmission Control Protocol / Internet protocol.

   • Set or stack of protocols that allow a computer to communicate across a WAN.
   • Protocols:
     • 1) Split data into packets
     • 2) Add address of recipient computer
     • 3) Notify sending computer when data's recieved

5. Examples:

   • File Transfer Protocol (FTP) - provides rules for file transfer often those to large for e-mail attachments.
   • Hypertext Transfer Protocol (HTTP) - provides rules for web browsers and servers when transferring information.
   • HTTPS - ensures communications between a host and client are secure by encrypting them
   • Simple Mail Transfer Protocol (SMTP) - provides rules for sending e-mail messages from client to server then server to server until it reaches its destination.
   • Post Office Protocol (POP) - used by client to retrieve e-mails for a mail server.
   • Internet message Access Protocol (IMAP) - same as POP but messages don't have to be downloaded.