CERTIFIED-IN-CYBERSECURITY Question #515: Real Exam Question with Answer & Explanation

Question

What is the PRIMARY goal of a firewall on a network?

Options

• AConnect multiple devices on a network
• BFilter data traffic on the basis of a set of rules
• CProvide information to other networked computers
• DControl the flow of network traffic

Explanation

The primary function of a firewall is to control incoming and outgoing network traffic by analyzing data packets and determining whether or not to allow them through based on a predetermined set of rules (see ISC2 Study Guide, Chapter 4, Module 1). For example, a firewall can be configured to block traffic from specific IP addresses or to allow traffic only on specific ports. The other options are incorrect because they do not accurately describe the primary function of a firewall. While a firewall does control the flow of network traffic, this is not its primary function, but rather a means to its primary function of filtering traffic. Connecting multiple devices on a network is typically the role of a router or switch, not a firewall. Finally, providing information to other networked computers is not the primary function of a firewall, but rather the role of servers and other network devices.

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