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

Options

A. It permits network transmission based on a set of rules.
B. It is a combination of both, software and hardware devices.
C. It is frequently used to protect a computer network from unauthorised access.
D. It is unable to permit legitimate communication to pass.

Answer

D

Explanation

In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It establishes a barrier between a trusted network and an untrusted network. Firewalls are categorized as a network-based or a host-based system. Network-based firewalls can be positioned anywhere within a LAN or WAN. They are either a software appliance running on a general purpose hardware, a hardware appliance running on special-purpose hardware, or a virtual appliance running on a virtual host. Host-based firewalls are deployed directly on the host itself to control network traffic or other computing resources.