Active Directory

Active Directory is a network-based object store and service that locates and manages resources, and makes these resources available to authorized users and groups. An underlying principle of the Active Directory is that everything is considered an object?people, servers, workstations, printers, documents, and devices. Each object has certain attributes and its own security access control list (ACL).

What is Global Catalog?

The Global Catalog authenticates network user logons and fields inquiries about objects across a forest or tree. Every domain has at least one GC that is hosted on a domain controller. In Windows 2000, there was typically one GC on every site in order to prevent user logon failures across the network.

What types of classes exist in Windows Server 2003 Active Directory?

Structural class:
The structural class is important to the system administrator in that it is the only type from which new Active Directory objects are created. Structural classes are developed from either the modification of an existing structural type or the use of one or more abstract classes.
 

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What is cache memory?

Cache memory is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM. As the microprocessor processes data, it looks first in the cache memory and if it finds the data there (from a previous reading of data), it does not have to do the more time-consuming reading of data from larger memory.

What is the difference between Unix and Windows?

Unix and Windows use completely different paradigms for run-time loading of code. Before you try to build a module that can be dynamically loaded, be aware of how your system works.

In Unix, a shared object (.so) file contains code to be used by the program, and also the names of functions and data that it expects to find in the program. When the file is joined to the program, all references to those functions and data in the file's code are changed to point to the actual locations in the program where the functions and data are placed in memory. This is basically a link operation.

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What is Backup Storage and the types of backup.

In computers, backup storage is storage that is intended as a copy of the storage that is actively in use so that, if the storage medium such as a HDD (Hard Disk) fails and data is lost on that medium, it can be recovered from the copy. In an enterprise, because the loss of business data can be a big problem differences, it is important that backup storage be provided.

On a personal computer, backup storage is commonly achieved with Zip drivers and DVDs or Store it in a local system itself. In an enterprise, backup storage can sometimes be achieved through replication of data in multidisc storage systems, such as RAID; as part of network-attached storage (NAS); as part of a storage area network SAN. Enterprise backup storage often makes use of both disk and tape as storage media. Special software is used to manage backup as part of a storage system.

Types of Backups:

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