Computer Networking Chapter 5 A Top-Down Approach Link layer KUROSE ROSS Anote on the use of these ppt slides We re making these slides freely available to all (faculty, students, readers) Combuter 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 Networking: A Top They obviously represent a lot of work on our part. In return for use, we only ask the following Down Approach .I 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!) 6th edition .I if you post any slides on a ww site, that you note that they are adapted Jim Kurose, Keith Ross from(or perhaps identical to) our slides, and note our copyright of this material Addison-Wesley March 20 2 Thanks and enjoy! JFK/KWR All material copyright 1996-2012 J F Kurose and K.W. Ross, All Rights Reserved Link Layer 5-1
Chapter 5 Link Layer Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 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 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: ❖ 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 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Link Layer 5-1
Chapter 5: The data link Layer Our goals: 口理解数据链路层服务原理 o差错检测和纠正 o共享广播信道:多址接入 o链路层编址 o可靠传输、流量控制:done! 口链路层实现 o以太网 o虚拟局域网 5: DataLink Layer 5-2
5: DataLink Layer 5-2 Chapter 5: The Data Link Layer Our goals: 理解数据链路层服务原理: 差错检测和纠正 共享广播信道: 多址接入 链路层编址 可靠传输、流量控制：done! 链路层实现 以太网 虚拟局域网
Link layer, LANs: outline 5. 1 introduction 5.5 link virtualization services 5.6 data center 5.2 error detection networking correction 5. 7 a day in the life of 5. 3 multiple access a web request protocols 5 4 LANS addressing, ARP Ethernet switches VLANS Link Layer 5-3
Link Layer 5-3 Link layer, LANs: outline 5.1 introduction, services 5.2 error detection, correction 5.3 multiple access protocols 5.4 LANs ▪ addressing, ARP ▪ Ethernet ▪ switches ▪ VLANS 5.5 link virtualization 5.6 data center networking 5.7 a day in the life of a web request
网络层和链路层的关系 网络层: 口选路:路由器确定去往目的节点的下一跳 口转发:在路由器内部将数据报从输入端口转移到输出 端口 链路层: 口将数据报从一个节点传输到相邻的下一个节点,如: o源主机→源路由器 o路由器→下一跳路由器 o目的路由器->目的主机 5: DataLink Layer 5-4
5: DataLink Layer 5-4 网络层和链路层的关系 网络层: 选路：路由器确定去往目的节点的下一跳 转发：在路由器内部将数据报从输入端口转移到输出 端口 链路层： 将数据报从一个节点传输到相邻的下一个节点，如： 源主机 -> 源路由器 路由器 -> 下一跳路由器 目的路由器-> 目的主机
些术语 节点:主机和路由器统称 心 为节点 链路:连接相邻节点的通 信信道 o有线链路 o无线链路 o局域网 帧:链路层分组称为帧 5: Datalink Layer 5-5
5: DataLink Layer 5-5 一些术语 节点：主机和路由器统称 为节点 链路：连接相邻节点的通 信信道 有线链路 无线链路 局域网 帧：链路层分组称为帧