Domain Name does not resolve to site's DC

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http://serverfault.com – I am facing a puzzle: My company has several branches, each branch's subnets have been defined in their own respective site, and each branch has its own RODC. However, when pinging to the domain name (let's say, "example.com"), instead of resolving to the site's RODC, it resolves to the one of the main DCs on the Head Office. AFAIK, when a computer on a site tries to resolve the domain name itself (e.g., when trying to access \\example.com\netlogon), it should resolve to the site's domain controller. So, why am I seeing this behavior here? Additional info: The main DCs on Head Office ar (HowTos)