What Is Layer 2?

Layer 2 is like that. Like what you definitely will ask. Layer 2 is like the second layer of a cake. Your cake has a bottom and top layer, but you can only have one with the other. You need both to make your cake complete—and to be able to eat it! Data link layer protocols deliver error-free information between two nodes over a shared communication link. The data link layer protocol frames the data before it is transmitted so that the receiving computer can put the data back in order. It also checks for errors during transmission. The data link layer protocols generate and respond to acknowledgments when data is sent from one computer to another. This layer also provides flow control so that the receiving computer can transmit data at the proper speed. A machine must control the data flow to avoid overwhelming the recipient with information. Upon sending data from one computer to another, an acknowledgment must be returned to let the sender know the data was received. This acknowledgment tells the sender how much data can be sent at one time so that it does not overwhelm the receiving computer. The local delivery is all about the second layer of the OSI model. That's right, you guessed it: Layer 2 ensures that data gets from one device to another on the same network! The two sublayers of Layer 2 are Logical Link Control (LLC) and Media Access Control (MAC). LLC controls how bits are sent across a physical connection, while MAC manages addressing, access control, and error detection. So when you're working on your next digital project, remember that without this layer, we'd be in big trouble—and our devices would never be able to talk to each other!