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414Lecture17preview

414Lecture17preview - Lecture 17 Link Layer Link Layer...

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Lecture 17 Link Layer Link Layer Overview ECSE 414 – Fall 2010
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ECSE 414, Lecture 17 2 Announcements Homework Assignment #4 Due Thursday Nov 11 2010 Michael Rabbat
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ECSE 414, Lecture 17 3 The Data Link Layer Goals: 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! instantiation and implementation of various link layer technologies Overview: link layer services error detection, correction multiple access protocols and LANs link layer addressing, ARP specific link layer technologies: Ethernet hubs, bridges, switches IEEE 802.11 LANs PPP 2010 Michael Rabbat
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ECSE 414, Lecture 17 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 “link” data-link layer has responsibility of transferring datagram from one node to an adjacent node over a link 2010 Michael Rabbat
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ECSE 414, Lecture 17 5 Link layer: context 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 Each link protocol provides different services e.g., may or may not provide reliable data transfer over link 2010 Michael Rabbat
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ECSE 414, Lecture 17 6 Link Layer Services Framing, link access: encapsulate datagram into frame, adding header, trailer channel access if shared medium
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  • Fall '10
  • Rabbat
  • Error detection and correction, Parity bit, media access control, Time division multiple access, Channel access method, Michael Rabbat

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