Adam works as a Network Administrator for passguide Inc. He wants to prevent the network from DOS attacks. Which of the following is most useful against DOS attacks?

An internet bot is an automated software agent used to perform tasks online, not a defensive security mechanism against DoS attacks.

A honeypot lures attackers to a decoy system for analysis and intelligence gathering, but it does not block or mitigate DoS traffic targeting production systems.

SPI is a firewall technology that maintains a state table of active connections and inspects each packet against that table. Because it can identify traffic that does not match a legitimate connection state, it is able to detect and discard the anomalous flood packets characteristic of DoS attacks before they consume network resources.

A distributed firewall extends policy enforcement to multiple points in a network but is not specifically designed with DoS mitigation as its primary function, making SPI the more targeted and correct choice.