lec-33 - What's Next Data Link Layer Introduction and...

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8 Nov 2008  BITS C481 (Computer Networks) 1 What’s Next… Data Link Layer Introduction and services Error detection and correction Multiple access protocols Link-layer Addressing Ethernet Link-layer switches (Hub, Bridge and Switch) PPP and HDLC Link virtualization: ATM, MPLS
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8 Nov 2008  BITS C481 (Computer Networks) 2 Link Layer: Introduction 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 Data-link layer has responsibility of transferring datagram from one node to adjacent node over a link 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 rdt over link
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8 Nov 2008  BITS C481 (Computer Networks) 3 Link Layer Services 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!!! Reliable delivery between adjacent nodes We learned how to do this already (Transport Layer)! Seldom used on low bit-error link (fiber, some twisted pair) Wireless links: high error rates Q: why both link-level and end-end reliability?
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8 Nov 2008  BITS C481 (Computer Networks) 4 Link Layer Services (more) Flow control: Pacing between adjacent sending and receiving nodes
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lec-33 - What's Next Data Link Layer Introduction and...

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