Comprehensive and Detailed Explanation:
* Understanding the Security Event:
* Administrator accounts are highly privilegedand require strict monitoring.
* Server 4 shows failed login attempts for the administrator account.This could indicate a brute-force attack or unauthorized access attempt.
* The fact thatnone of the admin login attempts were successfulsuggestssomeone was trying to guess the credentials.
* Why Option D is Correct:
* Failed logins for administrator accounts are a critical security concern.
* If an attacker gains access, they couldescalate privileges and compromise the network.
* Investigatingunauthorized admin login attemptsshould be thetop priorityin a log audit.
* Why Other Options Are Incorrect:
* A (Endpoint not submitting logs):While this is concerning, it does not indicate anactive attack.
* B (Lateral movement):There's no evidence of a compromised account moving between servers yet.
* C (Misconfigured syslog server):False negatives are a possibility, but thefailed admin loginsare real.