PPT-Handout # 4: Link Layer, Error Detection/Correction

Professor Yashar Ganjali Department of Computer Science University of Toronto yganjalicstorontoedu httpwwwcstorontoeduyganjali CSC 4582209 Computer Networks Announcements Programming assignment 1 out Sep 17. ECMs are useful for estimating both short term and l ong term effects of one time series on another Thus they often mesh well with our theories of pol itical and social processes Theoreticallydriven approach to estimating time se ries models ECMs ar Resources: . Problems in Evaluating Grammatical Error Detection Systems. , . Chodorow. et al.. Helping . Our Own: The HOO 2011 Pilot Shared . Task. , Dale and . Kilgarriff. . Error Correction. Two ways of handling . error correction. The receiver can have the sender retransmit the entire data unit. The receiver can use an error-correcting code. To correct the error. Locate the invalid bit or bits. CS. 3516 – Computer Networks. Chapter 5: The Data Link Layer. Goals:. . U. nderstand . principles behind data link layer services:. E. rror . detection, correction. S. haring . a broadcast channel: multiple access. 1. Rocky K. C. Chang 13 September 2010. The services at layers 1-2. 2. The lowest two layers:. Physical layer. Physical layer. Datalink layer. Datalink layer. Provide a virtual (unreliable) bit pipe to above. By,. B. R. Chandavarkar,. CSE Dept., NITK, Surathkal. Ref: . B. A. Forouzan, 5. th. Edition. This chapter is divided into five sections. .. The . first section introduces . types of errors. , the concept of redundancy, and . By,. B. R. Chandavarkar,. CSE Dept., NITK, Surathkal. Ref: . B. A. Forouzan, 5. th. Edition. This chapter is divided into five sections. .. The . first section introduces . types of errors. , the concept of redundancy, and . 5-. 1. . Review of . MAC protocols. channel partitioning,. by time, frequency or code. Time Division, Frequency Division. random access . (dynamic), . ALOHA, S-ALOHA, CSMA, CSMA/CD. carrier sensing: easy in some technologies (wire), hard in others (wireless). 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. P. Sebastian. (. Brandl. ). Some important questions. What are the most effective error correction strategies?. How would you define “effective” in this context?. When do you correct a learner error?. Data Link Layer Outline. Parallelism between Transport and Data Link Layer. Tanenbaum’s. Treatment/Model of Data Link Layer. Protocol 1: Utopia. Protocol 2: Stop-and-Wait. Protocol 3: Positive Acknowledgment with Retransmission [. Joel Tetreault . Claudia Leacock . University of. Gothenburg. September . 5, . 2014. . What is a grammatical error?. Syntax: “Each language has its own systematic ways through which words and sentences are assembled to convey meaning.” Fraser & . . Error-detection and -correction Techniques. Multiple Access Links and Protocols. Switched Local Area Networks . Link Virtualization: a Network as a Link Layer . Data Center Networking . Retrospective: A Day in the Life of a Web Page Request. Advanced Computer Networks. C13. . Term C10. Transmission Errors Outline. Error Detection versus Error Correction. Hamming Distances and Codes. Linear Codes - Parity. Internet Checksum. Polynomial Codes.