Final answer:
If the System Monitor Control (SMC) manager fails to receive the periodic "heartbeats" from the SMC agents, it indicates a communication failure.
Step-by-step explanation:
If the System Monitor Control (SMC) manager fails to receive the periodic "heartbeats" from the SMC agents, it indicates a communication failure.
The SMC manager and the SMC agents work together to monitor and control a system. The SMC agents send periodic "heartbeats" to the SMC manager to signify that they are functioning properly. If the SMC manager does not receive these "heartbeats", it suggests that the communication between the manager and the agents has been disrupted.
Examples of communication failures that can cause this issue include network connectivity problems, software glitches, or hardware malfunctions.