The 7x Layer model starts from Physical till Application Layer. OSI Model divides the network communication processes into seven layers in order to simplify it. Each layer performs specific functions to support the layers above it. Physical Layer is the first & lowest layer in the 7Layer OSI Model. It is responsible for ultimate transmission of data between sender & receiver. The physical layer defines the means of transmitting raw bits over the transmission media. It also defines how the data is carried over the Physical media rather than logical data packets over a physical data link connecting network nodes. The Read More …