R

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Replication topology

The configuration of the replication scheme between DCs in a forest.

RFC

Request For Comments, the basic definition of an Internet protocol as agreed upon by the IETF.

RID

Relative Identifier. A component of the SID.

Root domain

The top-level domain in a Windows domain tree. Also the top-level DNS domain in the Internet.

Routing group

A collection of Exchange 2000 and 2003 servers that share a common routing table. All of the servers within a routing group make automatic and consistent connections to each other to send messages.

RR

Resource record. A DNS zone file entry. DNS RRs include Start of Authority (SOA), Mail Exchange (MX), host, CNAME, and service (SRV). Each RR describes different types of information about hosts (computers) in the DNS domain. Windows 2000 uses DNS as the location service for network resources such as DCs and GCs, both of which are identified by service records.

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