Creating a forest trust with selective authentication 1

I have 2 forests in my environment, on different subnets and we will create a forest trust between those 2. First, we need to set in each DNS, a new stub zone (a stub zone is necessary because it is not authoritative for that domain, only points to the DNS server which is authoritative) and after, we will use for the forest trust in 2 ways creation (and for validation) AD Domains and Trusts tool. As an alternative we can use a secondary zone or a conditional forwarder to the other forest. The idea is to resolve the other forest name. The creation of a new trust is an easy process, using AD Domains and Trusts and in the same way, we can add (if we need) other types of trusts (external, shortcut, realm).
Thank you.