protocols

protocols

1. application level 4

   • HTTP (S)
     • 'http secure'. This protocol works like http, but also encrypts web page data before it is sent out of the browser or server, to make sure that nobody can intercept the data and read it themselves.
   • POP
     • Post Office Protocol (POP) allows emails to be downloaded and /or deleted from a mail server and viewed offline by an email client.
   • IMAP
     • Internet Message Access Protocol is similar in many ways to POP but it also offers more complex commands to manage emails on the server itself. Unlike POP the email remains on the server even after being downloaded to the device.
   • FTP
     • File Transfer Protocol' is a standard network protocol used to transfer (i.e. upload and download) files between a client and server on a computer network.
   • SMTP
     • Simple Mail Transport Protocol is used by the mail server itself to send and receive emails from all other mail servers across the internet.
   • HTTP
     • HyperText Transfer Protocol is the protocol underlying the World Wide Web. Web pages are sent and received using the http protocol.

2. transport level 3

   • TCP
     • the process used for communicating over the internet. it divides the message into packets.

3. network level 2

   • IP
     • When transmitting messages, this protocol is responsible for providing the destination address and to recognise incoming data packets.

4. link level 1

   • ethernet
     • Ethernet is a family of protocols responsible for sending and receiving data along a network cable. Ethernet works over a range of data speeds hence the reason for a family of protocols rather than just one.
   • bluetooth
     • This is a wireless protocol that was developed to allow devices that are very close to one another to exchange data.