LDAP and Domain Controller confusion question

Are LDAP servers and Domain controllers always one and the same?  Are they on different servers?
I know that DC's authenticate ID's   Then why do you need an LDAP server?
brothertruffle880Asked:
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Kevin StanushConnect With a Mentor Application DeveloperCommented:
I'm not sure what an LDAP server is per-se, but Active Directory internally uses LDAP to access and manage the information in Active Directory.  A lot of users can use Microsoft's Active Directory tools, such the Active Directory Users and Computers MMC tool, without knowing much if anything about the LDAP protocol.

Each domain controller in an Active Directory environment processes all requests for directory information, such as a list of the users as an example, into LDAP queries, gets the data from Active Directory, and presents it to you.  Only if you need to setup a complex filter, or have other more specific needs, do you ever really need to get into the LDAP area that much.  

If you run other directory service products other than Microsoft Active Directory, you will usually need more LDAP knowledge.
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DrDave242Connect With a Mentor Commented:
If you define an LDAP server as a server that can provide meaningful responses to LDAP queries, then the short answer is that every Active Directory domain controller is an LDAP server, but not every LDAP server is an Active Directory domain controller. This is simply because there are many non-Microsoft directory services which use LDAP.

Within an AD forest, there is no need for separate LDAP servers.
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brothertruffle880Author Commented:
Thanks!
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