Comment by motoboi

But that don't protect you from a malicious user hijacking this domain in the next cubicle. Perhaps, if your switches are not properly configured , that the guy in the next cubicle ou do some arp spoofing and https://intranet.yourdomain would be served by a bogus server collecting passwords.

But your users won't notice the difference, because they are used to see the certificate warning on his browser.