What is the next component after ADD3 in the 802.11 MAC frame?

What is the next component after ADD3 in the 802.11 MAC frame?

• A. ADD4
• B. SEQ
• C. DATA
• D. DUR

Answer: (B)

In 802.11 MAC frames, after the address fields the next part is the Sequence Control field. This two-byte field carries the sequence number and a fragment number, which are used to order frames and manage fragmentation so the receiver can properly reassemble data streams. If a fourth address is required (in certain ToDS/FromDS scenarios), that fourth address would come before Sequence Control; otherwise, you go straight to Sequence Control and then to the Data payload. So the field that follows the third address in the common case is Sequence Control.

In 802.11 MAC frames, after the address fields the next part is the Sequence Control field. This two-byte field carries the sequence number and a fragment number, which are used to order frames and manage fragmentation so the receiver can properly reassemble data streams. If a fourth address is required (in certain ToDS/FromDS scenarios), that fourth address would come before Sequence Control; otherwise, you go straight to Sequence Control and then to the Data payload. So the field that follows the third address in the common case is Sequence Control.