Question

which of the following is true of firewalls?
o a. they are used to guard against hackers and other security threats.
o b. they are typically used only by governmental agencies.
o c. they are typically used by hackers to gain unauthorized access to systems.
o d. they are used to increase the storage capacity of computers.

Explanation:

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Its main function is to protect a network or computer system from unauthorized access (such as from hackers) and other security threats. Option B is incorrect as firewalls are used by various entities (not just governmental agencies). Option C is wrong because firewalls are for protection, not for hackers to gain access. Option D is incorrect as firewalls have nothing to do with increasing computer storage capacity.

Answer:

A. They are used to guard against hackers and other security threats.