Which of the following statements about firewall (in the context of computing) is INCORRECT?

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.