I am going to install a new DC on a recently grown branch site. I know that is a best practice to create a new site in Active Directory Site and Service, with the relative IP link cost and related parameters.
However, both the HQ and this branch office are equipped with beefy internet connections (100 Mb/s Fiber) and I wonder if it is better to leave both on a single site (ie: enjoing very small replication latency as per intrasite policy).
On some well-know resources I read that anything > 10 Mb/s should be considered as a single site; however, others advice to map each physical site to an AD site.
What are established best practices?