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X.Five hundred is the placed of ITU-T computer networking standards covering electronic directory services such as white pages, Knowbot and whois. X.Five hundred was jointly developed using ISO as
a share of the Open Systems Interconnect suite of protocols, in order to trend lines a requirements of X.400 electronic mail
& title search.
A protocols defined by X.Five hundred involved Directory Access Protocol, Directory System Protocol, Directory Information
Shadowing Protocol, & Directory Operational Bindings Management Protocol.
One of a X.D series of specifications which has seen a widest utilize is non one of a directory protocols, notwithstanding, but
X.509, the specification of public-key certificates.
Compare: LDAP.
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