This is how an Ethernet frame is formatted and used. 33 Ways In 33 Days To 'Ace' Computer Networking... ➤➤ ALSO, when I mention in this video that the "Pre-amble" comes "before the actual frame" that DOES NOT mean the Pre-amble is not considered part of the frame. The Pre-amble IS considered part of the frame. When you take a quiz or certification test, be prepared to know the Pre-amble and know that it's also considered part of the frame (from most testing stand-points). See this related video for Preamble: Ethernet and Switching CCNA , CCIP, MCPIT, ,Networking