Final answer:
The subject of this question is Computers and Technology and the grade level is High School. A network interface card (NIC) or network adapter listens for traffic and implements a back-off timer if a collision occurs to prevent network congestion and collisions.
Step-by-step explanation:
The subject of this question is Computers and Technology and the grade level is High School.
The device that listens to ensure there is no traffic transmitting and implements a back-off timer if a collision occurs is called a network interface card (NIC) or network adapter.
When a NIC detects that the network is busy, it will wait for a random amount of time before trying to transmit data again. This is known as the back-off timer and helps prevent collisions in network communication.