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      Question

      A   ............   protects a computer from

      unauthorized access, by blocking all unnecessary network ports, which prevents a network program from communicating with another computer.
      A Firefox Correct Answer Incorrect Answer
      B Ethernet Correct Answer Incorrect Answer
      C Firewall Correct Answer Incorrect Answer
      D Router Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      Solution

      A firewall is a network security system, either hardware- or software-based, that uses rules to control incoming and outgoing network traffic. A firewall acts as a barrier between a trusted network and an untrusted network. A firewall controls access to the resources of a network through a positive control model. This means that the only traffic allowed onto the network is defined in the firewall policy; all other traffic is denied.

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