Chapter 9 Notes - Chapter 9 Notes Ethernet Overview IEEE...

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Chapter 9 Notes – Ethernet Overview IEEE Standards Ethernet operates in DLL and Physical Layer Ethernet is defined by DLL and Physical Layer protocols Ethernet Layer 1 Involves signals, bit streams that travel on media Limitations: Cannot communicate with upper layers Cannot identify devices Only recognizes streams of bits Cannot determine the source of a transmission when multiple devices are transmitting Ethernet Layer 2 Functions Connects to upper layers via Logical Link Control (LLC) Uses addressing schemes to identify devices Uses frames to organize bits into groups Uses Media Access Control (MAC) to identify transmission sources Logical Link Control 802.2 describes LLC sublayer functions 802.3 describes MAC sublayer and Physical layer functions Handles comm. Between upper layers and networking software & lower layers (hardware) Frames the Network layer packet Identifies the Network layer protocol Remains relatively independent of the physical equipment Media Access Control Two primary responsibilities: Data Encapsulation Media Access Control Data Encapsulation provides: Frame delimiting Addressing Error detection Encapsulation Provides DLL addressing Error detection Cyclic redundancy check (CRC) of frame contents (trailer) Controls placement of frames on media and removal from media Logical topology – multi-access bus
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Physical Implementations of Ethernet Success of Ethernet is due to:
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This note was uploaded on 04/29/2008 for the course ICTN 2154 taught by Professor Khoury during the Spring '08 term at East Carolina University .

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Chapter 9 Notes - Chapter 9 Notes Ethernet Overview IEEE...

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