Protocols

Protocols

1. Transport layer

   • TCP
     • Transmission control protocal prepares messages for transmission(break them up into chuncks) and re-assembles any received messages.

2. Network layer

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

3. Link layer

   • BLUETOOTH
     • This is a wireless protocol that was developed to allow devices that are very close to one another to exchange data.
   • 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.

4. Application layer

   • HTTP's
     • Web pages are sent and received using the HyperText Transmission protocol.
   • FTP
     • File Transfer Protocol is a protocol used to transfer files between a client and server on a computer network.
   • 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.
   • POP
     • Post Office Protocol allows emails to be downloaded and /or deleted from a mail server and viewed offline by an email client.
   • 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.

5. Layers can only communicate with layers next to them. the layers go in order of A-T-N-L but that is 4-1 not 1-4 because it is based on distance from the CPU