Which of the following statements is correct about the firewall?

A) It is a kind of wall built to prevent files form damaging the corporate.

B) It is a device installed at the boundary of a company to prevent unauthorized physical access.

C) It is a device installed at the boundary of an incorporate to protect it against the unauthorized access.

D) None of the above.

Correct Answer : It is a device installed at the boundary of an incorporate to protect it against the unauthorized access.

Explanation : A firewall can be the type of either a software or the hardware device that filters each and every data packet coming from the network, internet. It can also be considered as a device installed at the boundary of an incorporate to protect form unauthorized access. Sometimes firewall also refers to the first line of defense against viruses, unauthorized access, malicious software etc.