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Computer Glossary - N

NACS: 
Acronym for Netware Asynchronous Communication Services.

Nanosecond:
A billionth of a second. Used as a measure in many computer chips
 

Netbeui:
Netbeui is short for NetBios Enhanced User Interface. It is an enhanced version of the NetBIOS protocol used by network operating systems such as LAN Manager, LAN Server, Windows for Workgroups, Windows 95 and Windows NT. 

Netbeui was originally designed by IBM for their Lan Manager server and later extended by Microsoft and Novell.
 

Network: 
This a system that sends and receives data.
 

Network Adapter:
This is a hardware unit that connects a device to a communication line. For wide area networks (WAN), these adapters connect routers to the specific type of connection (T1, BRI) that is installed. For local area networks (LAN), these adapters connect workstations to the LAN (Ethernet or TokenRing) cabling. 
 

Network Card:
Also, Network Interface Card or NIC. This is a component of a computer that enables the computer to communicate with other computers via a direct network connection.
 

Newsgroup:
An online discussion community found on the USENET system. These groups cover thousands of different topics of information and are offered free of charge.
 

Node:
In networks, a processing location. A node can be a computer or some other device, such as a printer. Every node has a unique network address, sometimes called a Data Link Control (DLC) address or Media Access Control (MAC) address.
 

NTFS:
Short for NT File System, one of the file system for the Windows NT operating system (Windows NT also supports the FAT file system). NTFS has features to improve reliability, such as transaction logs to help recover from disk failures. To control access to files, you can set permissions for directories and/or individual files. NTFS files are not accessible from other operating such as DOS. 

For large applications, NTFS supports spanning volumes, which means files and directories can be spread out across several physical disks.
 

Null Value:
In computer programming, this represents something of no value. A null value could also indicate that the value for a row is either missing or not known. Placing a zero in a row would not be representative of a null value because zero is a value.

NVRAM: 
(Non-Volatile Random Access Memory) Any type of memory that is made non-volatile by connecting it to a constant power source, such as a battery. Therefore, non-volatile memory does not lose its contents when the main power is turned off.