The mail program that you are using is the TCP/IP Model application layer. Lets you understand this by an example, Suppose you wrote a mail and sent it to a friend of yours. Need For Data Link Layer Protocolsįirst of all, we should know what the need for a layer 2 protocol is. Remember in TCP/IP Model, layer 3 is an Internet layer, and layer 2 is a Data Link Layer (compared to OSI Model Layer 2 the physical layer and the data link layer are aggregated). SLIP is a very simple layer 2 protocol that provides basic frames for IP Datagrams, while the Point-to-Point Protocol is a more sophisticated, fully-featured data link layer protocol that provides frames as well as additional features that enhance security and performance.
There are two protocols available that help us fill the gap in the OSI Model between layer 3 (IP) and layer 2 (Data Link Layer). Read about TCP/IP Model and Architecture. IP serves its purpose at layer 3, but we need a protocol that can read the IP datagram and translate it to frames that the physical layer can pass to. There is a gap between the layer 3 and layer 2 in the OSI Model. In the TCP / IP Model the physical layer, together with the data link layer, is called the network interface layer, or just the link layer. The Physical Layer is the lowest layer on the OSI Reference Model.
Serial Line Internet Protocol, which is responsible for addressing the physical layer, Media Access Control ( MAC) and also framing the datagrams obtained from the layer 3 protocol i.e. In this blog we will look at one of the link-layer protocols, i.e.
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