Networks explained

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Across
  1. 5. a transmission of data to all devices within a network simultaneously
  2. 6. a network of millions of computers in a large geographical area
  3. 7. a networking device that forwards data packets between networks
Down
  1. 1. a division of a bigger network
  2. 2. a device used to connect to the wider internet via an ISP (short for "modulator-demodulator")
  3. 3. the flow of data across a network
  4. 4. a network device that connects different networks and facilitates communication between them