Editing Directory Access Protocol (section)

{{Single source|date=November 2023}}

'''Directory Access Protocol''' (DAP) is a [[computer network]]ing standard promulgated by [[ITU-T]] and [[International Organization for Standardization|ISO]] in 1988 for accessing an [[X.500]] [[directory service]].  DAP was intended to be used by client computer systems, but was not popular as there were few implementations of the full [[OSI protocol stack]] for desktop computers available to be run on the hardware and operating systems typical of that time. The basic operations of DAP: ''Bind'', ''Read'', ''List'', ''Search'', ''Compare'', ''Modify'', ''Add'', ''Delete'' and ''ModifyRDN'', were adapted for the [[Novell eDirectory|Novell Directory Services]] (NDS) and the [[TCP/IP]]-based [[Lightweight Directory Access Protocol]] (LDAP).{{ref RFC|4511|quote=The core protocol operations defined in this document can be mapped to a subset of the X.500 (1993) Directory Abstract Service [X.511]. However, there is not a one-to-one mapping between LDAP operations and X.500 Directory Access Protocol (DAP) operations.}}

DAP is specified in X.511.<ref>[https://www.itu.int/rec/T-REC-X.511 X.511 : Information technology – Open Systems Interconnection – The Directory: Abstract service definition]</ref>