The layers of the OSI model:

• The physical layer is the lowest layer in the OSI reference model. It is in charge of establishing a physical connection between the devices. Bits of information are stored in the physical layer. It is in charge of sending individual bits from one node to another.
• The data link layer is in charge of message transport from node to node. The major purpose of this layer is to ensure that data transfers from one node to another through the physical layer are error-free.
• The network layer is responsible for data transmission between hosts that are connected to various networks.
• The application layer receives services from the transport layer, while the network layer receives services from the transport layer. Segments are the units of data in the transport layer.
  
• This layer is in charge of establishing connections, maintaining sessions, authenticating users, and ensuring security.
• The translation layer is also known as the presentation layer. The data from the application layer is retrieved and processed here so that it may be transmitted across the network in the proper format.
• The Application layer, which is implemented by network applications, is at the very top of the OSI Reference Model stack of layers. These programmes generate the data that must be sent across the network.
  
  

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