Replication in Active directory

Hello Friends,

 Here are the information about Replication..

Explain Replication in Active directory?

Windows Server 2003 uses a replication model called multimaster replication, in which all replicas of the Active Directory database are considered equal masters. You can make changes to the database on any domain controller and the changes will be replicated to other domain controllers in the domain.

Domain controllers in the same site replicate on the basis of notification. When changes are made on a domain controller, it notifies its replication partners (the other domain controllers in the site); the partners then request the changes and replication occurs. Because of the high-speed, low-cost connections assumed within a site, replication occurs as needed rather than according to a schedule.

You should create additional sites when you need to control how replication traffic occurs over slower WAN links. For example, suppose you have a number of domain controllers on your main LAN and a few domain controllers on a LAN at a branch location. Those two LANs are connected to one another with a slow (256K) WAN link. You would want replication traffic to occur as needed between the domain controllers on each LAN, but you would want to control traffic across the WAN link to prevent it from affecting higher priority network traffic. To address this situation, you would set up two sites— one site that contained all the domain controllers on the main LAN and one site that contained all the domain controllers on the remote LAN. 

What are the different types of replication?

Single site (called intrasite replication)

Replication between sites (called intersite replication). 

■ Intrasite Replication Intrasite replication sends replication traffic in an uncompressed format. This is because of the assumption that all domain controllers within the site are connected by high-bandwidth links. Not only is the traffic uncompressed, but replication occurs according to a change notification mechanism. This means that if changes are made in the domain, those changes are quickly replicated to the other domain controllers. 

■ Intersite Replication Intersite replication sends all data compressed. This shows an appreciation for the fact that the traffic will probably be going across slower WAN links (as opposed to the LAN connectivity intrasite replication assumes), but it increases the server load because compression/decompression is added to the processing requirements. In addition to the compression, the replication can be scheduled for times that are more appropriate to your

organization. For example, you may decide to allow replication only during slower times of the day. Of course, this delay in replication (based on the schedule) can cause inconsistency between servers in different sites. 

What is LDAP?

LDAP, Lightweight Directory Access Protocol, is an Internet protocol that email and other programs use to look up information from a server.

An LDAP-aware directory service (such as Active Directory) indexes all the attributes of all the objects stored in the directory and publishes them. LDAP-aware clients can query the server in a wide variety of ways.

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