What does the concept of "defense in depth" entail?

The concept of "defense in depth" is a fundamental principle in cybersecurity which emphasizes the importance of implementing multiple layers of security to protect systems and data. This strategy recognizes that no single security measure is sufficient on its own. By employing various protection layers—such as firewalls, intrusion detection systems, antivirus software, encryption, and strong authentication practices—organizations can create redundancies that can thwart different types of attacks from various threat vectors.

This layered approach enhances overall security, as it not only makes it more difficult for an attacker to penetrate all layers but also allows for the detection and response to incidents at different stages. If one layer fails, additional layers can still provide protection, thereby reducing the risk of a successful breach.

In contrast, the other options do not align with the principles of "defense in depth." Relying on a single layer of security can lead to vulnerabilities, making systems more susceptible to attacks. Frequent password changes, while important for maintaining password security, do not encompass the broader strategy of a multi-layered security framework. Lastly, depending exclusively on backups without additional security measures leaves an organization exposed to a wide array of threats, such as ransomware, which could compromise data even if backups are in place. Thus, the multi-f