Networks

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Across
  1. 1. your device will lag without it
  2. 3. allows users to communicate using e-mail etc.
  3. 6. a string of numbers
  4. 8. an insulated wire or wires having a protective casing and used for transmitting electricity or telecommunication signals.
Down
  1. 2. a flexible, transparent fiber made by drawing glass or plastic to a diameter
  2. 4. domain name system
  3. 5. you cant text people outdoors anymore if it runs out
  4. 7. a computer program or device that provides a service to another computer program and its user