HPE6-A85: HPE Network Campus Access Associate ExamDemo

By HP · Question Mode

QuestionQ16

WLAN

What does a wireless client do first when its countdown timer reaches zero and it obtains a Transmit Opportunity (TXOP)?

  • A It sends a reassociation request frame to the AP and sends its Data Frames.
  • B It immediately sends its Data Frames and receives an ACK from the AP.
  • C It sends a CTS-to-self announcement to the AP and all other clients.
  • D It sends a CTS-to-self announcement to the ESP gateway.
Explanation

When a wireless station's countdown (backoff) timer expires it has gained the transmit opportunity and, in the standard non-protected case, sends its queued Data frame(s) immediately; the associated access point returns an ACK frame acknowledging successful receipt before the TXOP ends. This is the default CSMA/CA channel-access behavior defined in IEEE 802.11.

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