Yasandu's Advance networking crossword

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Across
  1. 5. The main circuit board of the computer
  2. 6. It is the address of a given unique resource on the Web
Down
  1. 1. It’s a unique name used to specify a particular computer on a network
  2. 2. Computers connected together to share data and resources
  3. 3. It prevents outsiders for accessing the private data of the network
  4. 4. It a computer based system that allows users and subscribers to exchange personal voice messages