|
Operating System |
RAM |
Disk Storage Required |
Multi-tasking? |
Multi-processing? |
Plug and Play? |
|---|---|---|---|---|---|
|
DOS |
256K |
None |
No |
No |
No |
|
Windows 3.1x |
2 MB |
10 MB |
Cooperative |
No |
No |
|
Windows 95 |
4 MB |
40 MB |
Preemptive |
No |
Yes |
|
Windows 98 |
16 MB |
175 MB |
Preemptive |
No |
Yes |
|
Windows NT Workstation 4.0 |
12 MB |
117 MB |
Preemptive (protected) |
Yes (two processors) |
No |
|
Windows NT Server 4.0 |
16 MB |
124 MB |
Preemptive (protected) |
Yes |
No |
|
Windows 2000 Professional |
32 MB |
650 MB |
Preemptive (protected) |
Yes |
Yes |
|
Windows 2000 Server |
64 MB |
671 MB |
Preemptive (protected) |
Yes |
Yes |
| New version of Windows NT (after NT 4.0) |
| Two versions: Professional and Server (also Advanced Server and Datacenter) |
| New features: Active Directory, dynamic disks, MMC, user interface enhancements, hardware support, VPN support, IPP (Internet printing) |
- Peer-to-peer (workgroup)
Each machine acts as both client and server; no dedicated servers; best for 10 workstations or less; supported by Windows 95, 98, and 2000 Professional
- Client/server (domain)
Uses one or more dedicated servers (domain controllers); centralized security and administration; best for 10 workstations or more or when security is important; supported by Windows NT Server and 2000 Server
- Domain controllers
Run Windows 2000 Server; each maintains a copy of user account database (Active Directory); multiple controllers synchronize periodically
- Member servers
Run Windows 2000 Server, but not configured as domain controllers; each relies on domain controllers for security; do not maintain a copy of the Directory database
- Clients
Typically run Windows 2000 Professional, Windows 95/98, and others; can log in to the domain and access its resources
- System partition
NTBOOTDD.SYS, NTLDR, BOOT.INI, BOOTSECT.DOS, NTDETECT.COM
- Boot partition
NTOSKRNL.EXE, HAL.DLL, WINNT files