What is the parameter used to check the integrity of the received frame in the 802.11 frame?

Question

Options

• AFrame Control
• BDuration
• CFCS
• DSequence Control Bits

• A
  2% (1)
• B
  9% (5)
• C
  86% (48)
• D
  4% (2)

Explanation

FCS, or Frame Check Sequence, is a 32-bit cyclic redundancy check (CRC) value appended to every 802.11 frame that allows the receiver to verify the frame arrived without corruption; the receiver recalculates the CRC over the received data and compares it to the transmitted FCS - a mismatch means the frame is discarded. Frame Control (A) carries metadata such as frame type, subtype, and protocol version, but plays no role in error detection. Duration (B) specifies how long the wireless medium will be occupied, which is used for network allocation, not integrity. Sequence Control (D) handles fragment numbering and duplicate detection to support reassembly, not error checking.

Memory tip: Think of FCS as the "seal on an envelope" - if the seal is broken when the packet arrives, you know something went wrong in transit.

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