What is active directory?

                 Ad is a service that identifies resources in a network and makes them available to the user.

                       Directory is a collection of information on about user group and computer. Active directory organizes those resources and make them accessible over the network.

Microsoft create it own implementations directory services in windows in called NTDS. Ntds in Windows NT can manage 40000 objects and it use flat name space like abs,

Yahoo.

First introduction of active directory was in 2k server. It uses hierarchical name space.

Example

Win NT    directory services (ABC) DC called PDC ADC called BDC.

Win 2k   active directory (abc.com)

2k server ……… it can manage 1million objects.

2k3 in 2k3 we can manage 10million objects the file to store directory information it called NTDS.dit. (Directory information tree)

Win2k and 2k3 support .com

The function of active directory benefit of active directory.

1. Cartelization management

2. Scalability

3. Extensibility 

4. Integration

5. Policy base administration

6. Replication of information like any change dc to ADC

7. Secure authentication

8. Active directory support multiple authentication module like Kerberos, ssl, smartcard certificate.

 

Structure of Active directory

Logical structure                         Physical structure 

1. Forest                                       1. DC

2. OU                                           2. GCS

3. Tree                                          3. Site

4. Domain

Requirement of active directory

O/S   NT, 2K, 2K3, 2k8

NTFS partition

LAN card connected

Static IP

250MB free space (200MB NTDS + 50 SYSBOL).

DCPROMO.EXE

What is forest?

By default first DC create a first forest. It content common GCS and share common schema.  

Advantage of ADC

Adc is use backup and fault tolerances.

It is read and write copy of DC.

It is run NLB.

Why we can create CDC and what is use.

1.  To create additional object.
2. To control replication.
3. By default two way transitive trusts create.
4. It shares contagious name space.

What is GCS?

GCS contain full information of OWN information.

NTDS.dit partition

1. Schema partition is format of object (like a form )
2. Configuration partition can store information who many DC, ADC, CDC
3. Domain partition data base like object information.

What is domain?

Domain is a logical boundary or domain is logical grouping of network elements manage by single administration.

What is tree?

Multiple interconnected CDC that share  name space called tree.