Hi, @Karun Khanna
Thank you for posting in Microsoft Q&A forum.
There will be no issue that extend schema in test domain.
ConfigMgr don't rely on AD in any way for client management, so multiple domains or forests with or without trusts are irrelevant.
Here is a great article by Jason about this:
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That's a licensing question best handled by your licensing partner or your account team.
Also, i understand we need to open port 80,443 to internet for SCCM. are there any specific websites that we need to open ports? are both ports mandatory?
please advise as security will ask the questions once i raise a firewall request for internet.
Here is all the network ports that Configuration Manager uses:
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