Which of the following is the MOST effective way to measure the effectiveness of security...

 Why Penetration Testing is Effective:

Identifies weaknesses in perimeter defenses by simulating real-world attack scenarios.

Provides actionable insights for strengthening perimeter security.

 Why This is Correct:

A qualified third party ensures unbiased testing and comprehensive evaluation.

 Why Other Options Are Incorrect:

A. Vulnerability Scan: Identifies known vulnerabilities but lacks the depth of penetration testing.

C. Internal Firewall Reviews: Limited to rule analysis, not testing overall effectiveness.

D. Network Intrusion Prevention Systems: Mitigates threats but does not measure control effectiveness.

 References:

EC-Council emphasizes external penetration testing as a critical tool for assessing perimeter network security controls.