Link Layer ▣5.1 Introduction and ▣5.6 Hubs and switches services ▣5.7PPP ▣5.2 Error detection 5.8 Link Virtualization: and correction ATM and MPLS ▣5.3 Multiple access protocols ▣5.4Link-Layer Addressing ▣5.5 Ethernet 5:DataLink Layer 5-35: DataLink Layer 5-3 Link Layer  5.1 Introduction and services  5.2 Error detection and correction  5.3Multiple access protocols  5.4 Link-Layer Addressing  5.5 Ethernet  5.6 Hubs and switches  5.7 PPP  5.8 Link Virtualization: ATM and MPLS