Data Link Layer3-2Unit 3: Outline3.1 Introduction and services3.2 Flow Control and Retransmission Protocols3.3 PPP and HDLC3.4 Multiple access protocols3.5 Ethernet3.6 Hubs and switches3.7 Wireless LAN
Data Link Layer3-3Unit 3.1Introduction
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Data Link Layer3-4Link Layer: IntroductionSome terminology:hosts and routers are nodescommunication channels that connect adjacent nodes along communication path are linkswired linkswireless linksLANslayer-2 packet is a frame,encapsulates datagramdatagram is a layer-3 packet.“link”data-link layerhas responsibility of transferring datagram from one node to adjacent node over a link