How important is LDAP over SSL with Active Directory?

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http://serverfault.com – I set out to integrate Active Directory with the iDRAC LOM for our Dell servers. One of the prerequisites is that the Domain Controllers be SSL enabled for ldap communication. The setup process in iDRAC says Upload Active Directory CA Certificate. So I log in to one of our DCs, go to its personal certificate store, and it's empty. Up until today I've always assumed that our domain services were using SSL (I wasn't the one who set up the domain). I've never set it up before myself, and I'm not too familiar with the ins-and-outs, so the only way I know to check whether we're using SSL or not is (HowTos)