At layer 2 of the OSI, there are three switching functions that can be performed. List and explain them and then give your feelings on which one is most efficient in its duties and discuss why. Solution Answer Layer 2 of the OSI is Data Link Layer, here In the Concept of Layer 2 ,Packet sequencing is defined . It has three Switching functions they are 1. Media Access Layer (MAC) 2. Logical Link Control (LLC) 3. Point-to-Point Protocol (PPP) Here MAC Â Â defines how to the computer on the network gain access to the data and its permission. In the Case of LLC it provides the synchronization Concept. it checks the error checking and flow control. In this layer2 the functionality of manages the frame traffic control over the network.It gives the Concept of traffic. As per the above discussion LLC is the most efficient compare with MAC in the layer 2 of the OSI model. .