Astrid's IT crossword puzzle

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Across
  1. 3. /a piece of computer software that controls input and output operations
  2. 4. /Which subnet class does 255.255.255.0 belong to? (answer includes a space)
  3. 7. /a networks characterization that yields an routing prefix after subnetting
  4. 9. /a group of binary digits or bits
  5. 10. /a command that shows the computer's and internet's IP adress
Down
  1. 1. /a unique string of character that identifies each computer Answer includes a space.
  2. 2. /a minute area of illumination on a display screen, one of many from which an image is composed
  3. 5. /the action of dividing a network into more networks
  4. 6. /a computer system with which a computer operates with
  5. 8. /a computer programm at the core of a computer's OS