Final answer:
CSMA/CD is an access control method used in LANs to prevent data collisions, but it can be implemented on both centralized and decentralized LANs. Devices using CSMA/CD listen to the network, wait if it is busy, and abort transmission if a collision occurs.
Step-by-step explanation:
CSMA/CD, which stands for Carrier Sense Multiple Access with Collision Detection, is an access control method used in Local Area Networks (LANs) to prevent data collisions.
The statement that CSMA/CD is always implemented on either centralized or decentralized access control LANs to prevent data collisions is false. CSMA/CD can be used on both centralized and decentralized LANs to prevent data collisions.
In CSMA/CD, before transmitting data, a device first listens to the network to check if it is idle. If the network is busy, the device waits for a random amount of time before trying to transmit again. If two or more devices transmit at the same time, a collision occurs, and each device detects the collision and aborts their transmission. CSMA/CD then implements a backoff algorithm to determine when each device should attempt to transmit again.
CSMA/CD, used for collision prevention in early Ethernet networks, is not always implemented in today's LANs, making the statement false as modern Ethernet technologies and topologies have made it redundant.
The statement that CSMA/CD is always implemented on either centralized or decentralized access control LANs to prevent data collisions is false. CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection, and it was primarily used in early Ethernet technologies on shared media, such as coaxial cable networks. It is a MAC (Media Access Control) protocol that monitors the network to avoid collisions by listening to the carrier before transmitting data. However, with the advent of modern Ethernet technology, which uses a star topology rather than a shared bus, and full-duplex communication, CSMA/CD is no longer necessary or used. Switched Ethernet networks do not experience collisions in the same way, so CSMA/CD is not applicable to all LANs.