A global catalog server is available to directory clients when Domain Name System (DNS) servers can
locate it as a global catalog server. In which order do the following events need to occur before the
catalog server is ready?
A) The Net Logon service on the domain controller has updated DNS with global-catalogspecific
service (SRV) resource records.
B) The isGlobalCatalogReadyrootDSE attribute is set to TRUE.
C) The global catalog receives replication of read-only replicas to the required occupancy level.

A.
C then A, then B

B.
B then C, then A

C.
A then C, then B

D.
C then B, then A

Explanation:
http://technet.microsoft.com/fr-fr/library/cc739901%28v=ws.10%29.aspx Verify global catalog
readiness When a global catalog server has satisfied replication requirements, the
isGlobalCatalogReady Root DSE attribute is set to TRUE and the global catalog is ready to serve
clients.http://technet.microsoft.com/de-de/library/howglobal-catalogserverswork%28v=ws.10%29.aspx How the Global Catalog Works Global Catalog Server Creation and
Advertisement By default, before a domain controller advertises itself as a global catalog server in
DNS, the global catalog contents must be replicated to the server. This process involves replication
of a partial, read-only replica of every domain in the forest except for the domain for which the new
global catalog server is authoritative. The duration of this process depends on how many domains
the forest contains, the size of the domains, and the relative locations of source and destination
domain controllers. If multiple domains are in the forest and if source domain controllers are located
only in distant sites, the process takes longer than if all domains are in the same site or in only a few
sites. When replication must occur between sites to create the global catalog, replication occurs
according to the site link schedule. Requirements for Global Catalog Readiness By default, a global
catalog server is not considered “ready” (the server advertises itself in DNS as a global catalog
server) until all read-only directory partitions have been fully replicated to the new global catalog
server. The Global Catalog Partition Occupancy registry entry under HKEY_Local_Machine\System
\CurrentControlSet \Services
\NTDS\Parameters determines the requirements for how many read- only directory partitions must
be present on a domain controller for it to be considered a global catalog server, from no partitions
(0) to all partitions (6). For domain controllers that run Windows Server 2003 or later, the default
occupancy value requires that all read-only directory partitions be replicated to the global catalog
server before the Net Logon service registers SRV resource records in DNS. For most conditions, this
default provides the best option for ensuring that a global catalog server provides a consistent view
of the directory. In less common circumstances, however, it might be useful to make the global
catalog server available with an incomplete set of partial domain directory partitions for example,
when delay of replication of a domain that is not required by users is jeopardizing their ability to log
on.