计算机网络：自顶向下 配套PPTChapter_6_V7.01.pptx

Chapter 6The Link Layer and LANsA note on the use of these Powerpoint slides:We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you see the animations; and 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:Computer Networking: A Top Down Approach If you use these slides (e.g., in a class) that you mention their source (after all, we’d like people to use our book!)If you post any slides 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 1996-2016 J.F Kurose and K.W. Ross, All Rights Reserved7th edition Jim Kurose, Keith RossPearson/Addison WesleyApril 2016Link Layer and LANs6-Chapter 6: Link layer and LANsour goals: understand principles behind link layer services:error detection, correctionsharing a broadcast channel: multiple accesslink layer addressinglocal area networks: Ethernet, VLANsinstantiation, implementation of various link layer technologiesLink Layer and LANs6-Link layer, LANs: outline6.1 introduction, services6.2 error detection, correction 6.3 multiple access protocols6.4 LANsaddressing, ARPEthernetswitchesVLANS6.5 link virtualization: MPLS6.6 data center networking6.7 a day in the life of a web requestLink Layer and LANs6-Link layer: introductionterminology:hosts and routers: nodescommunication channels that connect adjacent nodes along communication path: linkswired linkswireless linksLANslayer-2 packet: frame, encapsulates datagramdata-link layer has responsibility of transferring datagram from one node to physically adjacent node over a linkLink Layer and LANs6-Link layer: contexttransportation analogy:trip from Princeton to Lausannelimo: Princeton to JFKplane: JFK to Genevatrain: Geneva to Lausannetourist = datagramtran