Overview

• By far, the most popular data link layer

• Many different media, features, and speeds supported

• • Coax, twisted pair, fiber
  • QoS, multicast
  • 10Mbps, 100Mbps, 1000 Mbps (1 Gbps), 10 Gbps

• Point of confusion

• • Ethernet, IEEE 802.3, 10BaseT, CSMA/CD
  • Ethernet was standardized by the IEEE as 802.3 and uses CSMA/CD, typically on 10BaseT configurations
  • These terms are not really interchangeable, however