Troubleshooting on-premises AD

When it comes to troubleshooting on-premises AD, there are a ton of tools, built-in logs, and general commands for troubleshooting and resolving domain controller issues. However, we will focus on the key tools that help to uncover another layer of detail that logs simply do not provide when troubleshooting:

• As discussed previously, repadmin.exe is still a great friend to have in your corner for on-premises troubleshooting.
• Dcdiag.exe gives you access to a tool that runs tests across domain controllers and can be selectively targeted to specific DCs that have reported issues or faults. The tests include replication checks, Netlogon checks, advertising of roles, intersite checks and balances, FSMO checks, SYSVOL replication, and most importantly, DNS tests, which are the root cause of many an outage.
• Task Manager, MSInfo32.exe, and AutoRuns.exe can be used to identify any superfluous applications that may be running during startup, applications...