What type of defensive tools can we employ to protect our networks?

Answer each of the following questions. 500 words minimum for this forum. Does not need 500 words per question just 500 words total  

What is cyber warfare?
      What are the potential targets?
      What types of cyber weapons and tactics do intruders use?
      What type of defensive tools can we employ to protect our networks?
      What is the future of cyber warfare? 

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