Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

During a security debrief you learn that attackers harvested your Windows file-server's user and group lists by establishing a null session to TCP port 445. To stop similar enumeration attempts while keeping normal authenticated SMB file sharing intact, which hardening action should you apply first?

  • Change the server's NetBIOS computer name so it is harder to guess on the network.

  • Increase the DNS record Time-to-Live (TTL) for the server to limit name-resolution requests.

  • Disable or rename the built-in Guest account and set the registry value HKLM\SYSTEM\CurrentControlSet\Control\Lsa"RestrictAnonymous" to 2 (no anonymous enumeration).

  • Re-enable SMBv1 and turn off SMB signing to force legacy clients to use weaker authentication.

Certified Ethical Hacker (CEH)
Reconnaissance Techniques
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