What local area network (LAN) protocol uses CSMA/CD to avoid transmission collisions?

What local area network (LAN) protocol uses CSMA/CD to avoid transmission collisions?

• A. Ethernet
• B. Token Ring
• C. Fiber distributed data interface (FDDI)
• D. Internet protocol (IP)

Answer: (A)

Ethernet is the LAN protocol that uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD) as a method for managing data transmission and preventing collisions. In Ethernet networks, devices listen to the cable (carrier sense) before transmitting data to ensure that no other device is currently sending information. If two devices transmit simultaneously, a collision occurs, and CSMA/CD detects this event. When a collision is detected, the devices stop transmitting, wait for a random back-off period, and then attempt to retransmit. This process helps maintain efficient data flow over the network. The other options do not utilize CSMA/CD for their operation. For example, Token Ring uses a token-passing mechanism where a token circulates in the network, granting permission to one device at a time to transmit data; thus, it inherently avoids collisions. Fiber Distributed Data Interface (FDDI) also relies on a token passing approach over fiber optic cables, which is distinctly different from the collision detection method of Ethernet. Internet Protocol (IP) is a network layer protocol responsible for addressing and routing packets between devices over a network, rather than managing how those devices access the physical data layer or preventing collisions during transmission.

Ethernet is the LAN protocol that uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD) as a method for managing data transmission and preventing collisions. In Ethernet networks, devices listen to the cable (carrier sense) before transmitting data to ensure that no other device is currently sending information. If two devices transmit simultaneously, a collision occurs, and CSMA/CD detects this event. When a collision is detected, the devices stop transmitting, wait for a random back-off period, and then attempt to retransmit. This process helps maintain efficient data flow over the network.

The other options do not utilize CSMA/CD for their operation. For example, Token Ring uses a token-passing mechanism where a token circulates in the network, granting permission to one device at a time to transmit data; thus, it inherently avoids collisions. Fiber Distributed Data Interface (FDDI) also relies on a token passing approach over fiber optic cables, which is distinctly different from the collision detection method of Ethernet. Internet Protocol (IP) is a network layer protocol responsible for addressing and routing packets between devices over a network, rather than managing how those devices access the physical data layer or preventing collisions during transmission.