Which sequence of frame components represents the data link frame in order from start to end?

• A. Header, Data, Trailer
• B. Data, Header, Trailer
• C. Trailer, Header, Data
• D. Header, Trailer, Data

Answer: (A)

In a data link frame, the header comes first to carry addressing and control information, the payload is the actual data being sent, and the trailer finishes the frame with error-detection information. That makes the sequence: Header, Data, Trailer. If data appeared before the header, there’d be no addressing or frame synchronization to guide delivery. If the trailer came before the data, error checking would occur before the data it’s supposed to verify. If the data appeared after the header and trailer, the payload would be placed after the end of the frame, which isn’t how frames are structured. Understanding these roles helps you see why the correct order is Header, then Data, then Trailer.