The Internet and Education

1234567
Across
  1. 2. A form of communication at a distance
  2. 4. Secretive country
  3. 7. a pool of computer connected to each other
Down
  1. 1. This network of networks
  2. 3. A device that modulates and demodulates
  3. 5. Traditional transmission signal
  4. 6. network that covers a limited area