Final answer:
The next section after the Start of Frame (SOF) in an Ethernet frame is the Source MAC address. The Source MAC address identifies the original sender of the frame.
Step-by-step explanation:
The next section after the Start of Frame (SOF) in an Ethernet frame is the Source MAC address. The Ethernet frame format consists of several sections, including the Preamble, Start of Frame (SOF), Destination MAC address, Source MAC address, Length/Type, Data, and Frame Check Sequence (FCS). The Source MAC address identifies the original sender of the frame.