The term 'Defense in Depth' refers to a security strategy that employs multiple layers of defense to protect a network from a variety of threats. This approach is designed to ensure that if one security measure fails or is bypassed, additional measures are still in place to protect the system. By using a combination of security devices and practices—such as firewalls, intrusion detection systems, antivirus software, and physical security controls—organizations can create a more resilient defense.
This strategy contrasts with relying solely on a single type of security technology, as such a reliance may create vulnerabilities if that one layer is compromised. Establishing a strong physical presence in the office is important but does not encompass the full spectrum of security measures needed for cybersecurity. Similarly, limiting the number of users on a network does not effectively safeguard against potential external threats or ensure comprehensive security—it's just one piece of the broader security puzzle.
By utilizing the concept of Defense in Depth, a more robust security posture is achieved, which is crucial in today's complex cyber threat landscape.