ch5_2014_v3 - Chapter 5 Link Layer and LANs A note on the...

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Data Link Layer 5-1 Chapter 5 Link Layer and LANs A note on the use of these ppt slides: We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: v If you use these slides (e.g., in a class) in substantially unaltered form, that you mention their source (after all, we’d like people to use our book!) v If you post any slides in substantially unaltered form on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2010 J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down Approach 5 th edition. Jim Kurose, Keith Ross Addison-Wesley, April 2009.
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Data Link Layer 5-2 Chapter 5: The Data Link Layer Our goals: v 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! v instantiation and implementation of various link layer technologies
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Data Link Layer 5-3 Data Link Layer (Layer 2) 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 Link-layer switches 5.7 PPP 5.8 Link virtualization: MPLS 5.9 A day in the life of a web request
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Data Link Layer 5-4 Link Layer: Introduction Terminology: v hosts and routers are nodes v communication channels that connect adjacent nodes along communication path are links § wired links § wireless links § LANs v layer-2 packet is a frame , encapsulates datagram data-link layer has responsibility of transferring datagram from one node to physically adjacent node over a link
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Data Link Layer 5-5 Link layer: context v datagram transferred by different link protocols over different links: § e.g., Ethernet on first link, frame relay on intermediate links, 802.11 on last link v each link protocol provides different services § e.g., may or may not provide rdt over link transportation analogy v trip from Princeton to Lausanne § limo: Princeton to JFK § plane: JFK to Geneva § train: Geneva to Lausanne v tourist = datagram v transport segment = communication link v transportation mode = link layer protocol v travel agent = routing algorithm
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Data Link Layer 5-6 Link Layer Services v framing, link access: § encapsulate datagram into frame, adding header, trailer § channel access if shared medium § “MAC” addresses used in frame headers to identify source, dest different from IP address!
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