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Table Of Contents  CertiGuide to Network+
 9  Glossary

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(Page 1 of 2) Gatekeeper

A server that uses a directory to perform name-to-IP address translation, admission control and call management services in H.323 conferencing.

Gateway

A device connected to multiple physical TCP/IP networks, capable of routing or delivering IP packets between them. A gateway translates between different transport protocols or data formats (for example, IPX and IP) and is generally added to a network primarily for its translation ability.

GB

Gigabyte. 1,073,741,824 bytes. Equal to 1,024MB.

Global Catalog

A domain controller that contains a partial replica of every domain directory partition in the forest as well as a full replica of its own domain directory partition and the schema and configuration directory partitions. The Global Catalog holds a replica of every object in Active Directory, but each object includes a limited number of its attributes. The attributes in the Global Catalog are those most frequently used in search operations (such as a user’s first and last names) and those attributes that are required to locate a full replica of the object. The Global Catalog enables users and applications to find objects in Active Directory given one or more attributes of the target object, without knowing what domain holds the object. The Active Directory replication system builds the Global Catalog automatically. The attributes replicated into the Global Catalog include a base set defined by Microsoft. Administrators can specify additional properties to meet the needs of their installation.

Global group

For Windows 2000 Server, a group that can be used in its own domain, in member servers and in workstations of the domain, and in trusting domains. In all those places a global group can be granted rights and permissions and can become a member of local groups. However, a global group can contain user accounts only from its own domain.

Globally unique identifier (GUID)

A 16-byte value generated from the unique identifier on a device, the current date and time, and a sequence number. A GUID is used to identify a particular device or component.

Graphical Identification and Authentication (GINA)

A DLL loaded during the Windows 2000 Winlogon process, which displays the standard logon dialog box, collects, and processes user logon data for verification.


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