What is the default authentication type for Central Administration in WSS 3.0?
The default authentication type is NTLM. The other option is Kerberos Windows Integrated authentication which uses stronger authentication and utilizes secret-key cryptography. With NTLM, each user request is authenticated with the domain controller, which has an impact on the WSS performance. Kerberos does not impact the performance because the user credentials are stored on the WSS server, which eliminates the need for each user request to e authenticated against the domain controller.