Answer:
This type of attack, which attempts to overwhelm systems with data is know as:
Distributed Denial of Service Attack
Explanation:
Cyber Attack:
It is an attack on a computer or a network system to steal information, change something on a computer, gain unauthorized access to a system.
There are many types of cyber attack and one of them is
Distributed Denial of Service Attack:
Such a cyber attack in which the system is overwhelmed with the bulk data to damage a system. Recently, a company was attacked with a data in terabytes per second.
In our case, the utilities received thousand of bogus calls as attacker overwhelmed the utilities so that customers can't report real response so which is distributed denial of service cyber attack.