What reason should the DBA present for having both a firewall and a perimeter network?

• A. Redundant access control mechanisms
• B. Two-layered security approach and buffer zone
• C. Eliminating the need for user authentication
• D. Cost efficiency in network maintenance

Answer: (B)

Having both a firewall and a perimeter network offers a two-layered security approach and creates a buffer zone between the internal network and external threats. This setup significantly enhances security by ensuring that even if one layer is compromised, attackers will still face an additional barrier before gaining access to sensitive internal systems.

The perimeter network, often referred to as a demilitarized zone (DMZ), typically hosts public-facing services like web servers and email servers, isolating them from the internal network. The firewall can enforce strict access controls and rules governing traffic entering and leaving the perimeter network, further protecting the internal network from potential threats that have breached the outer defenses. By employing both these strategies, an organization can effectively reduce risks associated with unauthorized access and attacks, thus creating a more secure overall environment.