What device is used to protect one network from another by using filtering packets?
A.
Firewall
B.
Point to Point Tunnel
C.
VPN
D.
Router
Explanation:
Section Reference: Defining Firewalls and Other Perimeter Security Devices
Firewalls are used primarily to protect one network from another. They are often the first line of defense in
network security. Several types of firewalls exist:some run as software on server computers, some runas
stand-alone dedicated appliances, and some work as just one function of many on a single device.