Which of the following functions are performed by a firewall?

Which of the following functions are performed by a firewall? Each correct answer represents a
complete solution. Choose all that apply.

A.
It blocks unwanted traffic.

B.
It hides vulnerable computers that are exposed to the Internet.

C.
It enhances security through various methods, including packet filtering, circuit-level filtering, and
application filtering.

D.
It logs traffic to and from the private network.

Explanation:
C

A firewall is a combination of software and hardware that prevents data packets from coming in or
going out of a specified network or computer. It is used to separate an internal network from the
Internet. It analyzes all the traffic between a network and the Internet, and provides centralized
access control on how users should use the network. A firewall can also perform the following
functions:
Block unwanted traffic.
Direct the incoming traffic to more trustworthy internal computers.
Hide vulnerable computers that are exposed to the Internet.
Log traffic to and from the private network.
Hide information, such as computer names, network topology, network device types, and internal
user IDs from external users.