Which of the following are used to help reveal multiple layers of defense, help reveal application layer security protocols, and help validate network layer security settings by ensuring demilitarized and other isolated zones function as expected?

Network Security Procedures
Firewall Configurations
Penetration Tests
Virus Scans

Penetration Tests

Explanation:

So as to provide security awareness to communities and organizations, Penetration Tests which are also called Vulnerability Scans are used to help reveal multiple layers of defense, help reveal application layer security protocols, and help validate network layer security settings by ensuring demilitarized and other isolated zones function as expected.

Penetration tests

Explanation:

Penetration or pen test is a mechanism used by organizations to examine their private computer network system for loopholes or vulnerabilities attackers could exploit. The pen test helps to harden the network security policies configured on the network.

The organization hires a white hat hacker to carry out the penetration test. There are various types of pen test, they are blind test, black box and white box test, internal and external test etc.