Question

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5. List in the order they are sent the IEEE 802.11 fields in an Acknowledgement frame and their lengths in bytes. Do not break down the Frame Control field into subfields, as we have already looked at these details.

6. Give an estimate of the retransmission rate as the number of retransmissions over the number of original transmissions. Show your calculation.

7. What data rates does the main AP support? The rates are listed under tagged parameters.

8. What are the Type and Subtype values of Association Request / Association Response frames?

9. What are the Type and Subtype values for the Probe Request / Probe Response frames?

Answer 1

5) The fields are :

1. Frame Control ( 2 bytes)
2. Duration ( 2 bytes)
3. Receiver Address ( 6 bytes)
4. Frame Check Sequence ( 4 bytes)

6) The Estimate of the retransmission rate as the number of retransmissions over the number of original transmissions would be 1430 original data frames and 353 retransmission data.

Therefore Estimate of the retransmission rate is 353/1430) = 25%

7) The data rate AP supports are 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, and 54 Mbps. The rates are listed in two
tagged parameters as :

1. Supported rates
2. Extended supported rates

The 1, 2, 5.5, and 11 Mbps rates are marked "B", implies they are 802.11b legacy rates instead of 802.11g rates

8) Types and Subtypes are as follows:

• Association Request Type is 0(Management) and Subtype 0
• Association Response Type is 0(Management) and Subtype is 1

9) Types and Subtypes are as follows:

• Probe Request is Type 0 (Management) and Subtype 4.
• Probe Response is type 0. (Management) and Subtype 5

Thank You!