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Ethernet - PowerPoint PPT Presentation


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Ethernet. Elements of the Ethernet System. physical medium used to carry Ethernet signals between computers set of medium access control rules embedded in each Ethernet interface Ethernet frame that consists of a set of bits used to carry data over the system. Operation of Ethernet.

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Presentation Transcript
elements of the ethernet system
Elements of the Ethernet System
  • physical medium used to carry Ethernet signals between computers
  • set of medium access control rules embedded in each Ethernet interface
  • Ethernet frame that consists of a set of bits used to carry data over the system.
operation of ethernet
Operation of Ethernet
  • CSMA/CD Protocol
  • Collisions
  • Best Effort Data Delivery
    • High-level network protocols do this by establishing a reliable data transport service
ethernet frame and ethernet addresses1
Ethernet Frame and Ethernet Addresses
  • address fields
  • variable size data field - carries 46-1,500 bytes of data
  • error checking field - checks integrity of the bits in the frame to make sure that the frame has arrived intact
address fields
Address Fields
  • 48-bit addresses
  • IEEE controls assignment of these addresses
  • Organizationally Unique Identifiers (OUIs)
    • 24-bit identifier assigned to each organization that wishes to build Ethernet interfaces
    • organization creates 48-bit addresses using assigned OUI as the first 24 bits of the address
high level protocols and ethernet addresses
High-Level Protocols and Ethernet Addresses
  • High-level protocol software - e.g. TCP/IP protocol suite
  • Address Resolution Protocol (ARP)
address resolution protocol arp
Address Resolution Protocol (ARP)
  • Resolve physical address