Network Protocols

Network Protocols

1. A protocol is a set of rules. A network protocol defines the standards for data transmission.

2. HTTP hypertext transfer protocol

   • Used by a browser to access a webpage and communicate with a web server
   • Delivers web page data
   • The protocol requests the web server to transmit the requested web page to the user's browser for viewing

3. HTTPS hypertext transfer protocol secure

   • It is like HTTP but is encrypted
   • Encrypts the data and uses a secure socket layer for greater protection

4. FTP file transfer protocol

   • Transmits files between client and server computers
   • Used to upload and download files from a server
   • Used to access, edit, and move files between devices on a network

5. POP post office protocol

   • Used to retrieve an email from an email server to your device
   • Deletes messages on the email server once they have been downloaded to a single device
   • The server holds the email until you delete it
   • Used by most web based email clients
   • Works best with only one computer to check your email
   • Your emails are downloaded and stored on the computer that you use
   • Sent emails are stored locally on your computer and not on an email server

6. IMAP internet message access protocol

   • Used for accessing an email on a mail server via multiple devices
   • Maintains synchronisation of an email account across all devices
   • You can use multiple computers and devices to check your email
   • Your emails are stored on the server and your devices synchronise with the server
   • Sent emails stay on the server so you can access them from any device

7. SMTP simple mail transfer protocol

   • Used for sending email messages between mail servers
   • Used for sending only

8. TCP/IP is the protocol which dictates how data is sent between networks. It is made up of two protocols.

   • TCP transmission control protocol - Sets the rules for how devices connect on a network. It is in charge of splitting the data into packets and reassembling the packets back into the original data once they reach the receiving device. It is also responsible for checking the data is correcly sent and delivered.
   • IP internet protocol - responsible for directing packets to their destination across the network.