Network Arbitration and Contention JN0-452 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which statement accurately describes how CSMA/CA handles the possibility of collisions in a wireless LAN?

   • AIt relies on acknowledgments to detect collisions and immediately retransmit without waiting
   • BIt detects collisions by comparing transmitted and received signals, then schedules retransmissions
   • CIt avoids collisions by having stations sense the medium and wait a random backoff period before transmitting
   • DIt prevents all collisions by using a central coordinator that grants transmission rights
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A hospital deploys a new Wi-Fi network for IoT medical devices that transmit small, time-sensitive status updates every few seconds. The network engineer notices that as more devices are added, the number of retransmissions increases significantly. The engineer wants to reduce the collision probability without changing the application's transmission frequency. Which configuration change would most directly address this issue?

   • ADisable the random backoff algorithm
   • BIncrease the minimum contention window size
   • CDecrease the maximum contention window size
   • DReduce the interframe space (IFS) for all devices
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   What happens to the contention window (CW) after a failed transmission attempt in 802.11?

   • AIt is halved to allow faster retransmission
   • BIt remains the same for the next attempt
   • CIt is reset to the minimum value
   • DIt is doubled, up to the maximum CW value
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What is the primary benefit of frame aggregation in 802.11n/ac/ax?

   • AIt eliminates the need for acknowledgments
   • BIt reduces the overhead of contention and interframe spaces by sending multiple frames in one access opportunity
   • CIt allows stations to transmit on multiple channels simultaneously
   • DIt increases the transmit power of the radio
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A network administrator is analyzing a Wi-Fi network with a high collision rate. The administrator notices that the contention window is not increasing after collisions. Which configuration issue would cause this behavior?

   • AThe interframe space is configured too long, preventing backoff
   • BThe NAV is not being set correctly, preventing backoff
   • CThe contention window is configured with a fixed value, preventing exponential backoff
   • DThe physical carrier sensing is disabled, preventing backoff
   Reveal Solution Discussion Select an answer first