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How do you view all the GCs in the forest?

DSQUERY server can be used to locate global catalogs

To search the entire forest

dsquery server -forest -isgc

To locate global catalogs in your current (logon) domain

dsquery server –isgc

To locate global catalogs in a specific domain

dsquery server -domain tech.cpandl.com -isgc

Here, you search for global catalog servers in the tech.cpandl.com domain.

You can also search for global catalog servers by site, but to do this, you must know the full site name, and cannot use wildcards. For example, if you wanted to find all the global catalog servers for Default-First-Site-Name, you would have to type

dsquery server –site Default-First-Site-Name .

The resulting output is a list of DNs for global catalogs, such as

"CN=CORPSVR02,CN=Servers,CN=Default-First-Site-
Name,CN=Sites,CN=Configuration,DC=cpandl,DC=com"