Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

During a penetration test you established a null session to a Windows Server 2016 domain controller and enumerated the list of users with the command rpcclient -U "". In the after-action meeting, the system administrator asks how to block this technique while still permitting legitimate SMB file sharing. Which single configuration change is the most effective countermeasure?

  • Set the registry key HKLM\SYSTEM\CurrentControlSet\Control\Lsa\RestrictAnonymous to 2 to block anonymous SID-to-name translation.

  • Disable NetBIOS over TCP/IP on all domain controller network interfaces.

  • Implement an account lockout policy that disables an account after three failed logon attempts.

  • Enable mandatory SMB packet signing on the domain controller.

Certified Ethical Hacker (CEH)
Reconnaissance Techniques
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