Which type of attack broadcasts a network request to multiple computers but changes the address from which the request came to the victim's computer?

Smurf attack

Explanation:

In smurf attack is an attack of DDoS type, i.e., Distributed Denial of Service where a network request is broadcast to multiple systems but return IP address of the system sending the request is forged with the victim's IP address.

It is that type of DDoS attack where the Victim's system is flooded with spoofed ping packets. It left the system inoperable and is done by exploiting the Internet Control Message Protocol and IP of the system which is dangerous for both the sending end system and the victim's system.