Isla's crossword

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Across
  1. 1. what is a domain name system?
  2. 3. what blocks unauthorised access?
  3. 4. what is a temporary storage space?
  4. 7. what is powering a computer up from the off position?
  5. 8. what is a cable used in networks?
  6. 9. what makes up a picture on a computer?
Down
  1. 1. what is a file that organizes other files?
  2. 2. what routes traffic between networks?
  3. 5. what are text files retained on computers?
  4. 6. what is an plain old telephone service?