Why is the difference between the "administrators" group at the domain, and at the entire directory

I am searching teh active directory (Find Users, contacts, and groups). I have two "administrators" group. One at the level of the domain (I only have one domain) and another at the level of the "Entire Directory". Each of these groups has a different set of users.
The DCs are all running windows servers 2008 R2.
Mo HawkAsked:
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
Have a look at this http://techgenix.com/Built-in-Groups-Delegation/
You should only really be using built in administrator group and domain admins here, the other groups are perhaps custom?
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Shreedhar EtteCommented:
Hi Mo Hawk,

There should be only one administrators group. That too a Built in Group.

Please share screen shot to better understand your query.
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Tom CieslikIT EngineerCommented:
When you searching your domain.xxx you see groups in your DC, but Entire Directory is showing groups in entire Forest
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LearnctxEngineerCommented:
Normal Windows computers (standalone or domain joined member client/servers)  have a local security database called a SAM database (Security Accounts Manager). This database stores accounts and credentials local to the device. The local administrator account, any locally created accounts or groups, etc. When a server becomes a domain controller the local SAM database is suspended and the local database for a domain controller becomes the Active Directory database. Now you need to look at your AD database. The scenario you are describing is the child and parent domains within a forest. So:

root.domain
child.root.domain

At the forest level all of the domains are contained within the forest, but within each domain they are separate directory instances.

root.domain has its own domain database.
child.root.domain has its own domain database.

Domains are administrative boundaries. So with that in mind, you would not want people who are members of child\administrators automatically being members of root\administrators. In some organisations 1 team would manage the forest and root domain (look after the schema, etc.), while the individual child domains are delegated out to their own relevant domain administrators. So it is logical that there will be multiple Administrators groups throughout the forest, 1 for each domain. This will apply for ALL built-in groups.
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Kevin StanushApplication DeveloperCommented:
If you only have one domain, then you will only have one Administrators group, at least at the domain level.  Each non-domain controller (server, computer) will have its own administrators group.  On the dropdown for ''In:", you should only be seeing your domain, and 'Entire Directory'.  Look at the DN path of each of these 'administrators' groups when you look at it from the domain vs. 'Entire Directory'.  They should be the same.  I'm unclear why you indicate that the membership is different.
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
If your worried about your AD health

Run DCDIAG
NETDIAG
Active Directory BPA from Microsoft
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Mo HawkAuthor Commented:
Thanks for the comments. I still am not able to grasp:
1- If I have one domain, wouldn't the "administrators" group at the level of the "entire Directory" be the exact same group with the exact same members as the group I see when I search on the domain level?  But this is not the case with me, since I got members that exist in the first and not the second and vice versa.  
2- What is the difference between a member of the "administrators" group at the level of the Entire Directory and another at the level of the domain ?
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Mo HawkAuthor Commented:
In my second comment above, i was referring to the difference in access between the two groups.
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Mo HawkAuthor Commented:
Update: I think I figured it out. Although I have one domain that has the users and groups; that domain is a child of another domain that barely has a couple of users and groups. i.e. I have Entire Directory then under that mydomain, and then under that I have child.mydomain. So it seems the entire directory search is giving the result for MYDOMAIN as well as child.mydomain
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Kevin StanushApplication DeveloperCommented:
OK, well that would explain it, but you originally said that you only had one domain, which is why I think everyone was confused.
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Mo HawkAuthor Commented:
Ya sorry about that, I myself missed the parent domain (a few years back there were two child domains, hence the single parent and single child).
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