Which method would NOT be classified as a defense-in-depth strategy?

A defense-in-depth strategy involves implementing multiple layers of security controls across different areas of an organization's infrastructure to protect assets and mitigate risks.

One effective method of defense-in-depth is armor encryption, which provides data protection by ensuring that sensitive information is rendered unreadable to unauthorized users. This approach adds a layer of security that complements other measures an organization might be employing.

Threat vector analysis is another essential component that informs security practices by identifying potential attack vectors, thereby allowing organizations to implement measures to counteract those threats. This proactive analysis is crucial in enhancing the overall security posture.

Patch management is a critical practice within a defense-in-depth strategy, as it ensures that software vulnerabilities are addressed promptly through regular updates. By keeping systems patched, an organization can significantly reduce its susceptibility to attacks that exploit known vulnerabilities.

In contrast, ignoring software updates does not contribute to any layers of security; instead, it creates a vulnerability gap that can be exploited by attackers. This practice would undermine an organization's defenses and counteract the very principles of a defense-in-depth strategy, making it the only option that stands apart from being classified within that framework.