Answer (B) is correct . A firewall is a device that separates two networks and prevents passage of specific types of network traffic while maintaining a connection between the networks. Generally, an Internet firewall is designed to protect a system from unauthenticated logins from outside users, although it may provide several other features as well.
Answer (A) is incorrect because A firewall cannot adequately protect a system against computer viruses.
Answer (C) is incorrect because Industrial spies need not leak information through the firewall. A?telephone or flash drive is a much more common mean of sharing confidential information.
Answer (D) is incorrect because A?firewall cannot adequately protect against a Trojan horse (a program, such as a game, that appears friendly but that actually contains applications destructive to the computer system) or any other program that can be executed in the system by an internal user.
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