What is achieved by implementing blackhole routing for systems against DDoS attacks?

Implementing blackhole routing primarily serves the purpose of dropping traffic intended for a system that is under threat from Distributed Denial of Service (DDoS) attacks. This technique involves redirecting all traffic destined for a specific IP address (or set of addresses) to a null route or a "black hole," where the traffic is discarded and does not reach the targeted system.

The significance of this approach lies in its ability to mitigate the impact of DDoS attacks. During such attacks, the overwhelming volume of malicious traffic can incapacitate a system by consuming its resources and bandwidth. By employing blackhole routing, an organization can prevent the malicious traffic from affecting the system, effectively isolating the service from the attack and maintaining the integrity of the rest of the network.

While traffic inspection and filtering are important components of a comprehensive security strategy, they are not the primary focus of blackhole routing. The technique's main utility is in the immediate action of dropping unwanted traffic to ensure that legitimate users are not affected by the disruptive activity caused by the DDoS attack.