All of the following steps should be taken to prevent a Web server from IIS buffer overflow attacks except for which one?

Enabling IPP printing on IIS adds unnecessary functionality that expands the server's attack surface, and the IIS IPP implementation has historically been linked to exploitable buffer overflow vulnerabilities such as the MS01-023 vulnerability. Preventive measures focus on reducing attack surface and patching known weaknesses, so enabling IPP is counterproductive to hardening against buffer overflows. All other options - scanning for vulnerabilities, applying service packs, and using firewalls - directly reduce the risk of buffer overflow exploitation.

Frequent vulnerability scanning identifies unpatched weaknesses before attackers can exploit them, directly supporting buffer overflow prevention.

Installing Microsoft service packs applies security patches that fix known buffer overflow vulnerabilities in IIS components.

Effective firewalls restrict inbound traffic and can block exploit payloads targeting IIS, reducing the likelihood of a successful buffer overflow attack.