| 
Term  | 
Description | 
| 
Nanosecond | 
One-billionth of a second. | 
| 
Network | 
A group of computers connected together capable
  of sharing files and resources such as a modems, printers or hard drives. | 
| 
Network Adapter | 
See NIC. | 
| 
Network Administrator | 
A person responsible for the maintenance and
  operation of a computer network. | 
| 
Newsgroup | 
A virtual area or chat room on the Internet for
  the discussion of a specific topic. There is usually a moderator that can
  screen out any non-related or improper messages. | 
| 
NIC | 
Network Interface Card. An expansion card that
  fits into a computer and connects via the network cable to the NICs installed
  in other computers on the network. It works with the network operating system
  to send and receive information over the network. | 
| 
Node | 
In networking and communications, a node is any
  computer or device attached to the network. | 
| 
Noise | 
Interference on a communications channel often
  caused by nearby electrical equipment, power lines, or poor connections. | 
| 
Non-interlaced | 
A method of refreshing the image on a monitor. A
  Non-interlaced monitor refreshes the entire image (each scan line) in one
  pass. An interlaced monitor refreshes the odd-numbered scan lines first, then
  refreshes the even-numbered scan lines on the second pass, which can cause
  flicker and eye strain. | 
| 
Nonconductor | 
Any material that transmits or conducts
  electrical current very poorly. | 
| 
Numeric Keypad | 
A set of keys to the right of the main part of
  the keyboard, used for numeric data entry. | 
| 
NUMLOCK Key | 
A key on the keyboard that, when pressed, toggles
  on the ability of the keypad part of the keyboard to input numbers and
  numerical functions. When pressed again, the keys on the keypad perform
  cursor movement functions. |