Use this utility if you"re upgrading from an MS-DOS or Windows 95 computer to Windows NT。 If you"re upgrading Windows 95 to Windows NT， then you must install Windows NT in a different directory since Windows 95 cannot be automatically upgraded to Windows NT。 Winnt32。exe => Use this utility to upgrade a PREVIOUS version of Windows NT to a newer version of Windows NT。 When you use the "winnt32。exe" utility to upgrade an existing Windows NT computer， then the system files are upgraded in the background。 The /udf switch is used to specify the Uniqueness Database File， which along with the /u switch， is used to automate the installation process of Windows NT。

　　59。Bill Slates has just lost his original Windows NT setup disks。 How can he re-create the three setup disks without running the actual installation of Windows NT?

　　A。 By running the "winnt。exe" command with the /ox switch from the installation CD。 B。 By running the "winnt。exe" command from the installation CD。 C。 By using the Disk Administrator and selecting the Recreate Startup Disks option in the Tools menu。 D。 By using the Add / Remove Programs applet in the Control Panel。 Select the Windows NT Setup tab and choose Recreate Startup Disks。 A When you install Windows NT， you"ll have the option of creating the three setup disks for backup。 Anytime you lose or damage the three setup disks， then you can use answer (a) to re-create them。 However， you must do it from the installation CD。

　　60。What does the subnet mask do?

　　A。 Tell how many bits represent the network address and how many bits represent the host address。 B。 Combines many physical networks into one logical network。 C。 Hides the IP address from the user。 D。 Provides a route to reach remote networks。 A By using subnet， you can differentiate the network address from host address。