IT Topic4

Information Technology 03058002387



Sunday, 16 February 2020

Physical Layer

Physical Layer
*Message Has Begin and End
*Data in between
*Data Passed up to Link Layer

Physical Layer
*Begin Can Be Flag or STX
*End Can Be Flag or ETX
*End May Include Check Sum (CRC)

*Data Transparency

Link Layer
*Link Layer Header Has Frame Type
*Sequence and Acknowledgement Numbers
*Error Recovery Procedures

*Limited to Local Wire or Circuit

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