Ethernet

Ethernet

1. It is the predominant LAN technology in the world

2. Standards

   • Model OSI
     • Separate routing functionalities
       • framework
       • Access to data link layer media
       • Physical layer standards
   • Protocols
     • Cap 1
       • Communication with lower layers (MAC)
     • Cap 2
       • Connects to the upper layers through (LLC)

3. Encapsulation

   • Sublayer (MAC)
     • The MAC sublayer is the lower sublayer of the data link layer and is implemented by hardware, usually in the NIC of the computer.
       • Data encapsulation
         • Frame delimitation
         • Addressing
         • Error detection
       • Media access control
         • The media access control is responsible for placing the frames in the media and removing them from them.
   • Sublayer (LLC)
     • Communication between the upper and lower layers. Generally, this happens between the network software and the device hardware.

4. Evolution

   • 1973
     • Ethernet
       • Robert Metcalf, Xerox Corp, inventa Ethernet
   • 1980
     • Standard DIX Ethernet ll
       • Intel and Xerox, launch a standard for 10Mb / s ethernet via coaxial cable
   • 1983
     • IEEE 802.3 10 BASE-5
       • Ethernet de 10 Mb/s for cable grueso