name: DUA
full_form: Directory User Agent
context: In clause 6 properties of distributed databases were discussed in detail. This clause will see a specific instance of one, namely an X.500 based database. Figure A.2.1: X.500 based distributed database Figure A.2.1 shows a distributed database as it is defined in X.500. It supports the following communication protocols: Directory Access Protocol (DAP): defines the exchange of requests and outcomes between a DUA and a DSA (ITU-T). Directory System Protocol (DSP): defines the exchange of requests and outcomes between two DSAs (ITU-T). Directory Information Shadowing Protocol (DISP): defines the exchange of replication information between two DSAs that have established shadowing agreements (ITU-T). Directory Operational Binding Management Protocol (DOP): which defines the exchange of administrative information between two DSAs to administer operational bindings between them (ITU-T). The DUA in figure A.2.1 is equivalent to the network functions and enterprise applications discussed in
description: A Directory User Agent (DUA) interacts with a Directory System Agent (DSA) using the Directory Access Protocol (DAP) to access and manage directory information in a distributed database.
explanation: The text describes DUA as interacting with DSA via DAP, implying its function within a network architecture for managing directory information. This aligns with the definition of a Network Function.
section_title: A.2The Network Architecture
biotag_Context: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Technology,O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O
biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,B-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,O,O