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Which of the following statements about firewall (in the context of computing) is INCORRECT?
1. It is unable to permit legitimate communication to pass.
2. It is frequently used to protect a computer network from unauthorized access.
3. It permits network transmission based on a set of rules.
4. It is a combination of both, software and hardware devices.

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Correct Answer - Option 1 : It is unable to permit legitimate communication to pass.

The correct answer is It is unable to permit legitimate communication to pass.

  • A firewall is a network security device/software that monitors incoming and outgoing network traffic and permits or blocks data packets based on a set of security rules. Its purpose is to establish a barrier between your internal network and incoming traffic from external sources (such as the internet) in order to block malicious traffic like viruses and hackers.
  • A legitimate or genuine content can always pass through the firewall depending on the permission set by the firewall.
  • Firewalls filter traffic coming from unsecured or suspicious sources to prevent attacks and carefully analyze incoming traffic based on pre-established rules.
  • Firewalls guard traffic at a computer’s entry point called ports, which is where information is exchanged with external devices. 
  • Firewalls can either be software or hardware, though it’s best to have both.

  • A software firewall is a program installed on each computer and regulates traffic through port numbers and applications, and pre-defined rules, while a physical firewall is a piece of equipment installed between your network and gateway.

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