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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 Process – frame assembly before & frame parsing upon reception MAC layer adds header & trailer to Layer 3 PDU Encapsulation provides synch. Between the transmitting & receiving nodes Provides DLL addressing Error detection Cyclic redundancy check (CRC) of frame contents (trailer) Controls placement of frames on media and removal from media Initiation of frame trans. & recovery from trans. failure due to collisions Logical topology – multi-access bus
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Physical Implementations of Ethernet Success of Ethernet is due to:
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  • Spring '08
  • KHOURY
  • MAC address, LAN Historic Ethernet Ethernet, Historic Ethernet Ethernet, Physical Layer Ethernet, Layer protocols Ethernet

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