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Unit3_Link - Unit 3 Data Link Layer and LAN After studying...

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Data Link Layer 3-1 Unit 3 Data Link Layer and LAN After studying this unit, you will be able to 1. understand the principles behind data link layer services: 2. explain the principles of LANs.
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Data Link Layer 3-2 Unit 3: Outline 3.1 Introduction and services 3.2 Flow Control and Retransmission Protocols 3.3 PPP and HDLC 3.4 Multiple access protocols 3.5 Ethernet 3.6 Hubs and switches 3.7 Wireless LAN
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Data Link Layer 3-3 Unit 3.1 Introduction
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Data Link Layer 3-4 Link Layer: Introduction Some terminology: hosts and routers are nodes communication channels that connect adjacent nodes along communication path are links wired links wireless links LANs layer-2 packet is a frame , encapsulates datagram datagram is a layer-3 packet. “link” data-link layer has responsibility of transferring datagram from one node to adjacent node over a link
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