Both of those are based on old OSI protocols, which were terrifying in their complexity. LDAP mostly subsetted DAP and X.500 and added Internet concepts. SMNP l

Both of those are based on old OSI protocols, which were terrifying in their complexity. LDAP mostly subsetted DAP and X.500 and added Internet concepts. SMNP leveraged ASN.1 with some ideas from CMIP but using Internet concepts and attention paid to operations when the network is marginal (unlike CMIP) "What do you get when you cross a mobster with an OSI standard? You get someone who makes you an offer you can't understand."