Internal domain name when having a on-premises Exchange server

Hi Guys

Im planning to deploy a new domain Win 2012 and an Exchange server 2013, but I have doubts about the name for my domain, because of the SSL certificate.

Should I keep the domain.local convention name, domain.com or a subdomain like internal.domain.com convention.

I have this doubt because the SSL certificate cannot have the internal name for the autodiscovery.

Regards