AD REPLICATION PROTOCOLS

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The protocols that are used by Active Directory replication are described in the following table. RPC and SMTP are the replication transport protocols. LDAP is a directory access protocol, and IP is a network wire protocol.
Active Directory Access and Replication Protocols

 

ProtocolDescription
LDAP
The primary directory access protocol for Active Directory. Windows Server 2003 family, Windows XP, Windows 2000 Server family, and Windows 2000 Professional clients, as well as Windows 98, Windows 95, and Windows NT 4.0 clients that have the Active Directory client components installed, use LDAP v3 to connect to Active Directory.
IP
Routable protocol that is responsible for the addressing, routing, and fragmenting of packets by the sending node. IP is required for Active Directory replication.
Replication RPC
The Directory Replication Service (Drsuapi) RPC protocol, used in the enabling of administration and monitoring of Active Directory replication, to communicate replication status and topology and network topology from a client running administrative tools to a domain controller. RPC is required by Active Directory replication.
Replication Simple Mail Transfer Protocol (SMTP)
Replication protocol that can be used by Active Directory replication over IP network transport for message-based replication between sites only and for non-domain replication only.

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