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X.500 is a series of computer networking standards covering electronic directory services. The X.500 series was developed by ITU-T, formerly known as CCITT, and first approved in 1988.〔http://www.collectionscanada.gc.ca/iso/ill/document/ill_directory/X_500andLDAP.pdf〕 The directory services were developed in order to support the requirements of X.400 electronic mail exchange and name lookup. ISO was a partner in developing the standards, incorporating them into the Open Systems Interconnection suite of protocols. ISO/IEC 9594 is the corresponding ISO identification. ==X.500 protocols== The protocols defined by X.500 include * DAP (Directory Access Protocol) * DSP (Directory System Protocol) * DISP (Directory Information Shadowing Protocol) * DOP (Directory Operational Bindings Management Protocol) Because these protocols used the OSI networking stack, a number of alternatives to DAP were developed to allow Internet clients to access to the X.500 Directory using the TCP/IP networking stack. The most well-known alternative to DAP is Lightweight Directory Access Protocol (LDAP). While DAP and the other X.500 protocols can now use the TCP/IP networking stack, LDAP remains a popular directory access protocol. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「X.500」の詳細全文を読む スポンサード リンク
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