Session-3d: Data Transfer and Aggregation

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What is the purpose of frame aggregation in Wi-Fi? [Select possible correct answers]

1 point

To reduce the overhead of transmitting multiple small frames

To increase the throughput

To increase the range of the network

To avoid collisions in the medium

Required

Which IEEE Wi-Fi standard introduced the concept of frame aggregation?

1 point

802.11b

802.11g

802.11n

802.11ac

What is a blockack bitmap?

1 point

A bitmap that indicates the quality of the received data.

A bitmap that indicates last sequence number of received data frames

A bitmap that indicates which data frames have been received.

A bitmap that indicates starting sequence number of received data frames

What information does QBSS IE provide?[Select possible correct answers]
*

1 point

Station Count

Channel Utilization

Available Admission Capacity

Max supported data rate

Current channel

Required

Immediate Block Ack suitable for__________
*

1 point

high-bandwidth, low latency traffic

applications that can tolerate moderate latency

Low-bandwidth, High latency

Both B and C

Which of the following is eliminated by TXOP to reduce the overhead? *

1 point

Backoff/Contention

Preamble

ACK for data sent

NAV

What's the difference between Immediate and Delayed Block Ack?
*

1 point

Transmitter should buffer the data in Delayed Block Ack whereas it is not required in Immediate Block Ack

Block ACK is followed by a normal ACK in Delayed Block Ack where as normal ACK is not seen in Immediate Block ACK

Both A and B

Normal ACK is seen in both the cases along with Block ACK

What's the difference between A-MPDU and A-MSDU?
*

1 point

A-MPDU has individual MAC headers for each MSDU and A-MSDU has single MAC header for multiple MSDUs

A-MPDU has single MAC header for multiple MSDUs and A-MSDU has individual MAC header for each MSDU

Both A and B

None of the above

Which of the following is the right sequence during block ACKs? *

1 point

Block ACK request (and response) -> ADDBA request (and response) -> DELBA request (and response)

ADDBA request (and response) -> Block ACK request (and response) -> DELBA request (and response)

DELBA request (and response) -> ADDBA request (and response) -> Block ACK request (and response)

Block ACK request (and response) -> DELBA request (and response) -> ADDBA request (and response)

Which the following factors would contribute to overhead airtime? [Select possible correct answers] *

1 point

Retries

Frame Aggregation

Smaller Frame sizes

Block ACK

Required

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