Data Link Layer (Layer 2)

• Most complex of the layers
  • Often divided between MAC and LLC
    • MAC --> Media Access Control
    • LLC --> Logical Link Control
• One layer responsible for interfacing with physical hardware
  • Protocols used are programmed into firmware on hardware
• Checks for errors from the physical layer
• Puts control information in a header at the end of the packet
• Entire link layer is called a frame
• MAC address
• Communicates between the network layer and the physical layer

Computer Science Networking OSI Model