Chapter 5:Link layer our goals: understand principles behind link layer services: error detection,correction sharing a broadcast channel:multiple access link layer addressing local area networks:Ethernet,VLANs instantiation,implementation of various link layer technologies Link Layer 5-2 Link Layer 5-2 Chapter 5: Link layer our goals:  understand principles behind link layer services:  error detection, correction  sharing a broadcast channel: multiple access  link layer addressing  local area networks: Ethernet, VLANs  instantiation, implementation of various link layer technologies