Which statement about fragmentation is true?

• A. Fragments are never reassembled
• B. Each fragment contains a full copy of the original IP header
• C. Fragments are reassembled by the destination host using IP ID and fragment offsets
• D. RTT determines reassembly order

Answer: (C)

IP fragmentation splits a large datagram into smaller pieces so it can traverse networks with smaller MTUs. Each fragment has its own IP header, and all fragments of the same original datagram share the same identification value. The fragment offset tells where the fragment’s data fits within the original payload, and the More Fragments flag indicates if more fragments will follow. The destination uses the IP ID to group fragments belonging to the same datagram and the fragment offsets to place each piece in the correct position, reassembling the complete payload when all pieces arrive. RTT has no role in this process, as reassembly order is determined by the fragment offsets, not by timing.