What is current thinking/accepted practice for internal domain names?

* Registered domain name (e.g., somecompany.com)
* Fantasy tld (e.g., .mycorp)
* .local (collides zeroconf/mDNS)

This is for use within a corporate/campus setting.  In times past, I have
taken the fantasy approach.  However, colleagues have pointed out that the
growing list of new gTLDs and branded TLDs could collide with a fantasy
TLD.

RFC 2606 seems to suggest using a registered domain.  That¹s great except
that split-brain inevitably creeps into the equation.  Is this a case of
choosing the ³least worst² option?

Thanks,
Kelly

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