computing

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Across
  1. 4. establishes a barrier between a trusted internal network and untrusted external network
  2. 7. a process that reduces the amount of fragmentation
  3. 9. you use this to click on something
Down
  1. 1. gathers information about a person or organization
  2. 2. system a software that manages computer hardware
  3. 3. a collection of data or computer instructions that tell the computer how to work
  4. 5. Clean up junk, duplicate files, erase tracks and protect sensitive data
  5. 6. you use this to type words
  6. 8. stops viruses coming onto the computer