Final answer:
Link pulses are sent during low traffic times as part of the autonegotiation process in Ethernet networks to maintain a ready state for future communication.
Step-by-step explanation:
Link pulses are sent when data is not being transmitted to ensure that the physical media between networked devices remains operational and ready for future communication.
The correct answer to the question of when link pulses are sent when data is not being transmitted is:
These small signals, known as Normal Link Pulses (NLPs), are a part of the autonegotiation process employed by Ethernet networks to maintain a link between devices even when no data is being transmitted. They help in detecting the presence of a connection on the other end and in maintaining the integrity of the communication channel, ensuring that the network is ready for data transfer when required.