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GLOSSARY 47
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
node A member of a network or a point where one or more functional units
interconnect transmission lines.
noise Undesirable signals bearing no desired information and frequently ca
-
pable of introducing errors into the communication process.
non-system disk or disk error An error that occurs during the boot process.
Common causes for this error are leaving a non-bootable floppy disk in the
floppy disk drive while the computer is booting.
non-volatile A type of memory that retains data even if power is removed.
normal backup A full backup of every selected file on a system. This type of
backup turns off the archive bit after the backup.
Northbridge The chip that connects a CPU to memory, the PCI bus, Level 2
cache, and AGP activities; it communicates with the CPU through the FSB.
Newer Athlon 64-bit CPUs feature an integrated Northbridge.
NOS (network operating system) An NOS is a standalone operating system
or part of an operating system that provides basic file and supervisory services
over a network. Although each computer attached to the network will have its
own OS, the NOS describes which actions are allowed by each user and coordi-
nates distribution of networked files to the user who requests them.
notification area Located by default at the right edge of the Windows
taskbar, the notification area contains icons representing background processes,
and also contains the system clock and volume control. Most users call this area
the System Tray.
ns (nanosecond) A billionth of a second. Light travels 11 inches in one nano
-
second.
NTBOOTDD.SYS A critical Windows system file only for PCs booting to SCSI
drives.
NTDETECT.COM One of the critical Windows startup files.
NTFS (NT File System) A robust and secure file system that was introduced
by Microsoft with Windows NT. NTFS provides an amazing array of configura
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tion options for user access and security. Users can be granted access to data on a
file-by-file basis. NTFS enables object-level security, long filename support,
compression, and encryption.
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