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Is Kerberos enabled by default for Windows Server 2016 AD domain?

I'm new to Windows AD, so I've set up a virtual environment consisting of a Windows 2016 server and a few Windows 10 machines.

I wonder if the Windows AD use NTLM or Kerberos for network authentication (default settings)?

How can I check this? - and can both authentication mechanisms be used simultaneously?

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According to my knowledge, the Kerberos protocol is used for network authentication by default for windows server 2016. But the NTLM is still supported. I would suggest you to see the following article to learn for more information. For your reference: https://docs.microsoft.com/en-us/windows/desktop/secauthn/microsoft-ntlm Please refer to images to check which protocol is used by windows AD. image1image2image3 The Location is :server manager-tools-event viewer-windows logs-security. Search for the event log which event ID is 4624 and you can see the detailed anthentication information. https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4624 Also, we could use group policy to audit NTLM authentication logon attempts. Here is the location: computer configuration- policies-windows settings-security settings-local policies-security options-network security: restrict NTLM: Audit NTLM authentication in this domain. image4 image5 This policy will log events for NTLM pass-through authentication requests from its servers and for its accounts so that you can check it if the NTLM is used. Best Regards, Roger

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