GISP: GIAC Information Security Professional Certification

The IEEE 802 model splits the OSI Data-Link Layer into two sublayers: the Media Access Control (MAC) sublayer, which manages access to the physical transmission medium and hardware addressing, and the Logical Link Control (LLC) sublayer, which manages frame synchronization, flow control, and error checking, and provides an interface to the network layer. RARP is a Layer 3 address-resolution protocol, and SLIP is a full data-link layer protocol for serial connections, not a sublayer of the data-link layer.