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Glossary - G - I
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glossary menu

Every now and then we come across terminology that leaves us scratching our heads as to the meaning of certain acronyms, buzzwords or new IT terms emanating from our friends at Redmond (or Reading!). With this in mind, we've put together a glossary of terms for you to use, print off or cut-n-paste to your desktop which will help you sort out your ASPs (Active Server Pages) from your ASPs (Application Service Provider).
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[A]     [B-C] [D-F] [G-I] [L-M] [O-R]

Global Catalog A Global Catalog (GC) is a database that contains every object in the Active Directory (AD), but with a limited number of attributes for each object. Win2K automatically creates a GC on the first domain controller in the forest. This GC contains a complete replica of all the AD objects on the host domain and a partial replica of every other domain in the forest. Users (with the exception of domain administrators) can't log on to the network if a GC isn't available. A GC provides universal group information to domain controllers at logon and lets network users locate resources in the AD throughout the forest.
Gratuitous ARP Gratuitous Address Resolution Protocol (ARP) is a TCP/IP utility that ensures the uniqueness of a client’s IP address. A Win2K DHCP-enabled client can automatically self-configure an IP address when a DHCP server isn't available. But before a client uses the IP address, the client uses a gratuitous ARP to verify that no other client on the network segment is using the same address.
GRE Generic Routing Encapsulation (Cisco)
GUID A computer’s Globally Unique Identifier (GUID), a special ID that computer manufacturers supply, consist of 32 hexadecimal text digits--8 digits followed by 4, 4, 4, and 12 digits (e.g., hhhhhhhh-hhhh-hhhh-hhhh-hhhhhhhhhhhh, where h is a hexadecimal digit). Valid entries are limited to 0123456789 abcdef-ABCDEF. You can find a computer’s GUID either on the machine's case or in the BIOS. If you're using Windows 2000's (Win2K) Remote Installation Services, you can pre-authorize a computer by using its GUID. This is a 32 digit number that consists of the computer’s hardware address (i.e. MAC address) preceded by 24 zeros (e.g. 00000000000000000000-0060979C6AB9).
HCL A Windows 2000 (Win2K) Hardware Compatibility List (HCL) is a list of devices that Win2K supports. Hardware vendors perform certain tests on their devices to ensure that their products work reliably with Win2K before submitting the results to Microsoft. Before you install a device on your Win2K computer, you should ensure that the device is on the HCL. If you don't see a device on the HCL, don't conclude that the device won’t work reliably with Win2K--it might simply mean that the manufacturer has not designed or tested the product to meet Microsoft’s compatibility standards. Nevertheless, it's a good idea to use only products on the HCL.
IP/ATM Internet Protocol/asynchronous transfer mode (IP/ATM) is a group of services that includes three main components: an IP/ATM client, an ATM ARP server, and a Multicast Address Resolution Server (MARS). The IP/ATM client contains the ATM adapter for contacting the MARS server. The ATM ARP server, which contains a database of IP and ATM addresses of all the clients, resolves broadcast and multicast IP addresses to ATM addresses. MARS resolves multicast IP addresses to ATM addresses of those clients that have joined a multicast group. Windows 2000 Server (Win2K Server) includes an ATM ARP/MARS service.





















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