Data Link Layer : It is the 2nd layer of the OSI model which is generally responsible for transferring the datagram across an individual link. It is considered one of the most complicated layers and also has complex functionalities and liabilities. It also ensures that the appropriate physical protocol is assigned to the data.
Transport Layer : It is the 4th layer of the OSI model which is responsible for providing transparent transfer of data among end-users, thus providing reliable data transfer services to the top layers. Its main objective is to deliver the entire message from source to destination.
