802.3 Ethernet MAC Layer Frame

• Frame Check Sequence (2 Octets)

  • Receiving NIC recomputes FCS number
  • If disagrees with transmitted FCS field, discards the frame!
  • Does not ask for a retransmission
  • A higher layer must do this

Pre

SFD

DA

SA

Len

Data

PAD

FCS

Previous slide

Next slide

Back to first slide

View graphic version