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A mail exchange (MX) resource record specifies a mail exchange server for a DNS domain name. It is stored in the zone file of the Domain Name Server (DNS). A mail exchange server is a host that either processes or forwards mails for the DNS domain name.

Registry is the central storage for all configuration data. It stores Windows operating system configuration, the computer hardware configuration, configuration information about Win32-based applications, and user preferences in a hierarchical database file.

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DNS server is a computer that runs the Domain Name System (DNS) service.

It contains host name-to-IP

address mappings, IP address-to-host name mappings, information about the domain tree structure, etc. A DNS server is also used to resolve DNS client queries.

A resource record is a DNS record. It maps a Fully Qualified Domain Name (FQDN) to an IP address in a DNS zone.

Fully Qualified Domain Name (FQDN) is a unique name of a host or computer, which represents its position in the hierarchy. An FQDN begins with a host name and ends with the top-level domain name. FQDN includes the second-level domain and other lower level domains.

For example, the FQDN of the address HTTP://WWW.UNI.ORG will be WWW.UNI.ORG

where WWW is the host name, UNI is the second-level domain, and ORG is the top-level domain name.

A site is a collection of

one or more well-connected (usually a local area network) TCP/IP subnets. The network between the subnets must be highly reliable and fast (512 Kbps and higher). Although the sites are defined on the basis of location,

they can be spanned over more than one location. A site structure corresponds to the physical environment, whereas a domain is the logical environment of the network. A site can contain single or multiple domains, and a domain can contain single or multiple sites.

Sites are created to physically group the computers and resources for optimizing the network traffic. Administrators can configure Active Directory access and replication technology to take advantage of the physical network by configuring sites. When a user logs on to a network, the authentication request searches for the domain controllers in the same site where the user is located.

The Group Policy Management Console (GPMC) is a tool for managing group policies in Windows Server 2003. It provides administrators a single consolidated environment for working on group policy-related tasks. GPMC provides a single interface with drag-and-drop functionality to allow an administrator to manage group policy settings across multiple sites, domains, or even forests. GPMC is used to back up, restore, import, and copy group policy objects. It also provides a reporting interface on how group policy objects (GPOs) have been deployed.

A domain local group is used to define and manage access to resources within a single domain. Domain local groups can have groups with global scope and universal scope, accounts, other groups with domain local scope, and a mixture of any of the above as their members. Members of domain local groups can be assigned permissions only within a domain.

Software Update Services (SUS) is a tool used to acquire and distribute critical Windows patches to computers running Windows operating systems. Administrators use SUS to download and test the patches, and then deploy the patches to the appropriate computers running the Automatic Updates clients. SUS consists of three components:

1. Software Update Services (SUS) that runs on the server.
2. Automatic Updates (AU) that runs on client computers.
3. Group Policy settings that control AU clients from Active Directory.

SUS does not support Microsoft Office or Microsoft BackOffice products. It updates the operating systems (except Windows NT or Windows 9x), Microsoft IIS, and Microsoft Internet Explorer (IE) only.