Biomedical Equipment Technician (BMET) CDC Set A Volume 4 Practice Test – Prep Guide

The protocol that allows devices to communicate without data collision over a local area network is Token Ring. Token Ring operates using a token-passing mechanism where a specific token circulates around the network. In order to transmit data, a device must capture the token; this ensures that only one device can send its data at a time, effectively preventing collisions.

In contrast, Ethernet uses a Carrier Sense Multiple Access with Collision Detection (CSMA/CD) method, where devices listen for a clear line before transmitting data. If two devices transmit simultaneously, a collision occurs. Wireless Fidelity (Wi-Fi) also employs a similar method known as CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance), which can also experience collisions in busy networks. Point-to-Point Protocol (PPP) is designed for direct communication between two nodes and does not apply to local area networks in the same context as the other protocols listed.

Therefore, Token Ring is the correct answer as it is specifically designed to eliminate data collisions through its token-passing system.