Why perimeter ?

• Briefly you have :

• An area where an officer is responsible

  • His company or employer Information System

• An area where the same officer has no liabilities

  • The rest of the world

• Between his company information system and the rest of the world : the Information System perimeter

• We need to know were to start and where to end liability

• We need to protect the area where the officer is responsible

• Liability ═► Perimeter ═► Firewalls