Im 3 or 4 sentences ,describe the function of the domain name servers (DNS servers) In EXHIBIT 1. why are the DNA servers not the cause of failure during the attack (DDoS attack)?

Pleaser describe it to how it is implemented in the exhibit 1 diagram

Exhibit 1 diagram:

DNS Servers Cast Roaler Cust Intemet Router Natwok Monago iPremier Co. Cage Rouser F Eshernet Switches Web Server Clst Netwwk MTPPOP Servee Datuhse Server DIAGRAM SIMPLIFIED FOR ILLUSTRATION PURPOSES