Question-05)

In the following IEEE 802.11 frame the Address 2 is:

Question

Question-05)

In the following IEEE 802.11 frame the Address 2 is:

BlackTom AI · Accepted Answer

Address 2 in an IEEE 802.11 MAC header carries the transmitter (originator) MAC address, i.e., the source of the frame.

1) Relevant concepts:
- The 802.11 MAC header contains four address fields (Address 1–4) whose meanings depend on the ToDS and FromDS bits in the Frame Control field.
- Common role mapping (most frequent cases):
  - Address 1 = Receiver address (RA, next hop / immediate receiver)
  - Address 2 = Transmitter address (TA, the station that sent the frame)
  - Address 3 = Depends on direction (either final destination or BSSID/router interface)
  - Address 4 = Used only in WDS (both ToDS and FromDS = 1) to carry the original source/destination as needed

2) Step-by-step reasoning:
- Look at typical scenarios:
  - Station → AP (ToDS = 1, FromDS = 0): Address 1 = AP (receiver), Address 2 = STA (transmitter/source), Address 3 = final destination on DS.
  - AP → Station (ToDS = 0, FromDS = 1): Address 1 = STA (receiver), Address 2 = AP (transmitter/source), Address 3 = original source on DS.
  - IBSS/Ad-hoc (ToDS = 0, FromDS = 0): Address 1 = destination, Address 2 = source, Address 3 = BSSID.
- In every common mapping above Address 2 is the MAC of the device that transmitted (originated) the frame on the wireless medium.

3) Calculations:
- No numerical calculations are required; mapping is based on bit settings and header field positions.

4) Why the correct answer is correct:
- The header diagram labels Address 1–4 in the standard order; by 802.11 specification Address 2 is defined as the transmitter/origination MAC for frames on the wireless link. Thus Address 2 is the source (origination) address.

5) Why the other options are incorrect:
- "The final receiver (destination) address of frame": That role is usually Address 1 (the immediate receiver), not Address 2.
- "The MAC address of router interface to which AP is attached.": That address can appear in Address 3 in certain ToDS/FromDS combinations (or Address 4 in WDS), but it is not generally Address 2.

Conclusion: Address 2 is the source (origination) address of the frame, which matches the provided correct answer.

Question-05) In the following IEEE 802.11 frame the Address 2 is:单项选择题

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