BBN Tech Info..

Bridgehead Server :  Hey guys lets discuss about Bridgehead Server in Active Directory, What is Bridgehead Server ? What exactly the bridgehead server responsible in Active Directory ? So We all know that all domain controllers within the same site will participate in the replication process with each other, not all domain controllers will replicate with other sites simultaneously. This is because replicating Active Directory data between sites using all available domain controllers can be an extremely bandwidth-intensive operation. To further minimize the bandwidth implications of Inter-site replications, Active Directory will designate a bridgehead server within each site. All traffic within a site is replicated to that site's bridgehead server. The bridgehead server is then responsible for replicating all changes that have taken place within that site to other bridgehead servers in remote sites. The Inter-site Topology Generator ( ISTG ) automatically assigns one se...

AD Replication In depth (Advanced Concept): Hi Guys in continuation with my previous post ( Active Directory Replication Process ) Lets talk about replication in depth, so we know how Intra-site and Inter-site replication works, what topology, what protocols, default values and all. But we will have some questions like what happens if a object changes same time in different DCs with in site ?, what happens when a object last name or first name or attribute of object what ever changed in two or more different sites with same value and same time ?, which one actually get updated in the NTDS database ?. These all question will come on our mind. So now will talk about this. AD needs to be able to track changes from different sources and determine which objects need to be replicated from one domain controller to another. So each domain controller maintains a local value called an update sequence number (USN) that keeps track of changes that are made at each domain controller and th...

Active Directory Replication , Hi.. Lets talk about Active Directory Replication how it works, what topology, protocols and types of replications used in active directory. So first what is replication. ?  Active Directory replication is a process where in a domain controller any creation, modification, deletions are happened to a objects ( Users, Computers, Groups, etc..) that will sync with  other domain controller this process is like  from originating domain controller to destination domain controller which they are connected as one to another  called connection object this process is called replication. This is for providing fault tolerance to active directory database.   Active Directory creates a replication topology with the idea that all writeable domain controllers in domain should communicate active directory information to each other; in addition to communicating forest-wide information with other domains. Sites and subnets defined within acti...

The Active Directory schema defines what different types of objects looks like within Active Directory. Whatt is a user ? what properties does a group have ? Active directory comes with a prepopulated base schema and it can be modified or extended to meet the needs of custom applications. Every resource in Active Directory is represented as an object and each object has a set of attributes that are associated with it. In Active Directory, each object is defined within the Active Directory schema. The schema is a a master database that contains definitions of all objects in the Active Directory--in a way it defines what Active Directory is. The schema has two components: object classes and attributes. Each object that is represented in Active Directory--for example, the user smith and the printer Laserprinter- is an instance of the user and printer object classes, respectively. Each object class in the schema is further defined according to a list of attributes that make the ...

What is Active Directory ? " Active Directory is directory service, Microsoft developed and introduced in windows 2000 Server. It is only used in Microsoft windows domain network environment for security, easy administration and with set of process and services. It provides a centralized authentication service for Microsoft networks". Some of the benefits of Active Directory include a hierarchical organizational structure, Multi-Master authentication (the ability to access and modify AD from multiple points of administration) to create fault tolerance and redundancy, a single point of access to network resources. Active Directory contains user, computers, groups, sites, organization units, servers, domain controllers, printers and applications. All these we can access from  Start --> Administrative tools Active Directory Users and Computers, Active Directory Domains and Trusts and Active Directory Sites and Services. A  Directory  Service allows businesses...