A screened host provides added security by using Internet access to deny or permit certain traffic from the Bastion Host. Answer: D is incorrect. A network interface card provides a physical connection between computers within a network.

Answer: B is incorrect. Demilitarized zone (DMZ) or perimeter network is a small network that lies in between the Internet and a private network. It is the boundary between the Internet and an internal network, usually a combination of firewalls and bastion hosts that are gateways between inside networks and outside networks. DMZ provides a large enterprise network or corporate network the ability to use the Internet while still maintaining its security. Answer: A is incorrect. A proxy server facilitates a more efficient use of the Internet connection bandwidth and hides the real IP addresses of computers located behind the proxy.