Protocols

Protocols

1. Application

   • SMTP - Simple Mail Transfer Protocol
     • The protocol used by the mail server to send and recieve emails from other mail servers
   • IMAP - Instant Message Access Protocol
     • A protocol that is similar to POP but you can access your email on multiple devices and your emails can be more complex.
   • POP - Post Office Protocol
     • A protocol that allows emails to be downloaded / deleted from the mail server and viewed offline. It is very simple however as can only handle one mail box and messages cannot be viewed on other devices
   • HTTP(S) - HyperText Transfer Protocol (Security)
     • A web page made up of text, images, styling, javascript. It allows a browser to request these files from a web server and onto your browser. The S stands for security and these encrypt your data before sending it.
   • FTP - File Transfer Protocol
     • A protocol used to transfer files across a client server network

2. Transport

   • TCP - Transmission Control Protocol
     • A protocol which splits the data into packets, adds a sequence number onto the end so the packets can be ordered at the recieving end and adding extra error correcting data

3. Network

   • IP - Internet Protocol
     • Protocol which adds the IP address of the sending device and the recieving device

4. Link

   • BLUETOOTH
     • The protocol which allows devices to exchange data when physically very close
   • ETHERNET
     • The protocol of sending data through cables. Hardware. Specifies the performance expected of network cables, plugs and sockets. Data format. Describes the format of the data packets sent or received over the network. How to deal with data collisions i.e. when two devices send data at exactly the same time.