CREST Practitioner Security Analyst (CPSA) Practice

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Which access method is used to avoid collisions on wireless networks?

  1. Carrier Sense Multiple Access with Collision Detection

  2. Carrier Sense Multiple Access with Collision Avoidance

  3. Carrier Sense Multiple Access with Channel Allocation

  4. Carrier Sense Multiple Access with Signal Processing

The correct answer is: Carrier Sense Multiple Access with Collision Avoidance

The access method specifically designed to prevent collisions on wireless networks is Carrier Sense Multiple Access with Collision Avoidance. This protocol is crucial for enhancing communication efficiency in environments where multiple devices may attempt to transmit data simultaneously. In wireless networks, the risk of collisions—where two devices transmit at the same time, resulting in data loss—can significantly degrade network performance. Carrier Sense Multiple Access with Collision Avoidance addresses this issue by using a strategy that listens for ongoing transmissions before transmitting data. If the channel is clear, the device will then send its data. If another device is detected trying to send data at the same time, it employs a backoff strategy, which means it will wait for a random period before attempting to transmit again. This helps minimize the chance of simultaneous transmissions, thereby reducing the likelihood of collisions. Understanding this method is essential for anyone working with wireless communications, as efficient space utilization and minimizing data loss are necessary for optimal network functionality.