The IT Stuff

NTFS is the standard file system uses for storing and retrieving files on a hard disk of Windows NT, including its later versions Windows 2000, Windows XP, Windows Server 2003, Windows Server 2008, Windows Vista, and Windows 7.

Domain Functional Level

Windows 2000 mixed (Default)
Windows 2000 native
Windows Server 2003 interim
Windows Server 2003

Windows 2000 mixed:

Supported domain controllers: Microsoft Windows NT 4.0, Windows 2000, Windows Server 2003
Activated features: local and global groups, global catalog support

Windows 2000 native:

Supported domain controllers: Windows 2000, Windows Server 2003
Activated features: group nesting, universal groups, SidHistory, converting groups [...]

Types of Groups:
Security
Security groups are used to control access to resources. They can also be used as e-mail distribution lists.It allow you to manage user and computer access to shared resources. You can also control who receives group policy settings. This simplifies administration by allowing you to set permissions once on multiple computers, then to [...]

VLAN Trunking Protocol (VTP) is a Cisco Layer 2 messaging protocol.
Manages the addition, deletion, and renaming of VLANs on a network-wide basis.
VTP reduces administration in a switched network.
When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same [...]

To backup Active directory you back up the System State on Domain Controller  servers.
The System State contains

The local Registry,
COM+ Class Registration Database,
the System Boot Files,
certificates from Certificate Server (if it’s installed),
Cluster database (if it’s installed),
NTDS.DIT,
and the SYSVOL folder.