Lecture Business data communications and networking (8th edition): Chapter 4 - Jerry Fitzgerald, Alan Dennis

Lecture Business data communications and networking (8th edition): Chapter 4 - Data link layer. In this chapter, the following content will be discussed: Media access control, error control, data link protocols, transmission efficiency. | Business Data Communications and Networking 8th Edition Jerry Fitzgerald and Alan Dennis John Wiley & Sons, Inc Prof. M. Ulema Manhattan College Computer Information Systems 4 - Copyright 2005 John Wiley & Sons, Inc Chapter 4 Data Link Layer 4 - Copyright 2005 John Wiley & Sons, Inc Outline Media Access Control Controlled Access, Contention, Relative Performance Error Control Sources of Errors, Error Prevention, Error Detection, Error Correction via Retransmission, Forward Error Correction Data Link Protocols Asynchronous Transmission, Asynchronous File Transfer Protocols, Synchronous Transmission Transmission Efficiency 4 - Copyright 2005 John Wiley & Sons, Inc Data Link Layer - Introduction Responsible for moving messages from one device to another Controls the way messages are sent on media Organizes physical layer bit streams into coherent messages for the network layer Major functions of a data link layer protocol Media Access Control Controlling when computers . | Business Data Communications and Networking 8th Edition Jerry Fitzgerald and Alan Dennis John Wiley & Sons, Inc Prof. M. Ulema Manhattan College Computer Information Systems 4 - Copyright 2005 John Wiley & Sons, Inc Chapter 4 Data Link Layer 4 - Copyright 2005 John Wiley & Sons, Inc Outline Media Access Control Controlled Access, Contention, Relative Performance Error Control Sources of Errors, Error Prevention, Error Detection, Error Correction via Retransmission, Forward Error Correction Data Link Protocols Asynchronous Transmission, Asynchronous File Transfer Protocols, Synchronous Transmission Transmission Efficiency 4 - Copyright 2005 John Wiley & Sons, Inc Data Link Layer - Introduction Responsible for moving messages from one device to another Controls the way messages are sent on media Organizes physical layer bit streams into coherent messages for the network layer Major functions of a data link layer protocol Media Access Control Controlling when computers transmit Error Control Detecting and correcting transmission errors Message Delineation Identifying the beginning and end of a message Data Link Layer Physical Layer Network Layer 4 - Copyright 2005 John Wiley & Sons, Inc Media Access Control (MAC) Controlling when and what computers transmit Important when more than one computer wants to send data (at the same time over the same circuit); ., Point-to-point half duplex links computers to take turns Multipoint configurations Ensure that no two computers attempt to transmit data at the same time Main approaches Controlled access Contention based access 4 - Copyright 2005 John Wiley & Sons, Inc Controlled Access Controlling access to shared resources Acts like a stop light Commonly used by mainframes (or its front end processor) Determines which circuits have access to mainframe at a given time Also used by some LAN protocols Token ring, FDDI Major controlled access methods X-ON/X-OFF and Polling 4 - Copyright 2005 John .

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