Hi,
You can use Nslookup command to check DNS Records. All your machines that point to your internal DNS will resolve A record and PTR record succesfully.
Nslookup A record or FQDN should return corresponding IP address. Nslookup IP address should return corresponding FQDN.
For more details about the command of Nslookup, you can refer to the following article:
Best Regards,
Candy
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