Exam CS0-002 topic 1 question 62 discussion

I first picked C, but see that E is correct. Also found this: Duplicate DNS entries Most of the configurations gives the KRB_AP_ERR_MODIFIED error because of old DNS entries on your DNS server are not removed. Simply remove these so you only have one IP address per server and one server per IP address (use the sort on the DNS Manager to find duplicates). Also check the reverse lookup zone as the Kerberos use this lookup to make the server-match. And remember the replication delay for other DNS servers and the DNS-timeout on clients before testing – better wait a couple of minutes (or up to 30 min. for auto-repl.) Source: https://jespermchristensen.wordpress.com/2008/06/12/troubleshooting-the-kerberos-error-krb_ap_err_modified/

The chances are that the Windows Domain Controller is probably acting as the DNS server (as well as other services), so going to go with given answer.

I think people posting answers from ChatGPT should refrain from voting. Sometimes, the answers are plain wrong and you're skewing the votes in the wrong direction.

The error event you provided is related to Kerberos authentication, and it indicates an issue with the decryption of a ticket by the target server. In order to troubleshoot this event, the security analyst should examine the Windows domain controller environment.

C for me. "Check if there are identifically named server accounts in these two domains" The error message specifically mentions a Kerberos error. The target server (DBASVRR4$) is likely a server in a Windows domain, and issues with Kerberos authentication are often related to problems with domain controllers. This could be due to issues with the domain controller's ability to authenticate and decrypt the Kerberos ticket. In order to know if there is a duplicity of names in the domain, you should first check the DC (Windows Domain Controller)

ChatGPT convinced me. I have checked because I also chosen C at first: C. Windows domain controller. The error message in the SIEM log indicates that there is an issue with Kerberos authentication, specifically that the target server failed to decrypt the ticket provided by the client. This suggests an authentication issue between the client and the server, and the event ID (4) is typically associated with Kerberos errors. The target name in the error message also indicates that it is related to a Windows domain controller (DC), which is responsible for authenticating users and computers in a Windows domain. Therefore, the security analyst needs to examine the Windows domain controller to continue troubleshooting the event.

"The kerberos client received a KRB_AP_ERR_MODIFIED error from the server host/myserver.domain.com. This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. Commonly, this is due to identically named machine accounts in the target realm (domain.com), and the client realm. Please contact your system administrator." Cause During access to the IIS 6 web site that support Windows Integrated Authentication, the following issues may occur: Mismatch DNS name resolution. The issue is common in an NLB environment that uses multiple IPs or network adapters. The user doesn't have a Local NTFS access permission. The Web Site is using Application Pool with a poor permission setting.

The error states '... use the fully qualified name' leading me to believe the DNS Server would be the best place to look at, coincidentally the DNS server could be located on a domain controller

Windows domain controller

E is correct.

looks good to me

Given answer is correct : https://docs.microsoft.com/en-us/troubleshoot/windows-server/windows-security/kerberos-client-krb-ap-err-modified-error

E is correct "Check if there are duplicated names on the network" clearly points to DNS.

D - is O.K.

Correct