Chapter 5: The data link layer Our goals O understand principles behind data link layer services: o error detection correction o sharing a broadcast channel: multiple access o link layer addressing o reliable data transfer, flow control: done! D instantiation and implementation of various link lyer technologies 5: DataLink Layer 5a-25: DataLink Layer 5a-2 Chapter 5: The Data Link Layer Our goals:  understand principles behind data link layer services:  error detection, correction  sharing a broadcast channel: multiple access  link layer addressing  reliable data transfer, flow control: done!  instantiation and implementation of various link layer technologies