Your network contains an Active Directory domain.
The domain contains 20 domain controllers.
You need to identify which domain controllers are global catalog servers.
Which toolshould you use?

A.
dsquery

B.
netsh

C.
nltest

D.
Get-ADOptionalFeature

Explanation:
http://technet.microsoft.com/en-us/library/cc732885%28v=ws.10%29.aspx
Dsquery server
Dsquery is a command-line tool that is built into Windows Server 2008. It is available if you have theActive
Directory Domain Services (AD DS) server role installed.
Syntax
dsquery server [-o {dn | rdn}] [-forest] [-domain <DomainName>] [-site <SiteName>] [-name <Name>] [-desc
<Description>] [-hasfsmo {schema | name | infr | pdc | rid}] [-isgc] [{-s <Server> | -d <Domain>}] [-u
<UserName>] [-p {<Password> | *}] [-q] [-r] [-gc] [-limit <NumberOfObjects>] [{-uc | -uco | -uci}]
Parameters
..
-gc
Specifies that the search use the Active Directory global catalog.
…
To find all domain controllers in the domain widgets.contoso.com that are global catalog servers, type:
dsquery server –domain widgets.contoso.com -isgc