Which component is considered part of a layered defense strategy?

A layered defense strategy, also referred to as defense in depth, involves implementing multiple security measures to protect information and systems. Firewalls are a fundamental component of this strategy, serving as the first line of defense against unauthorized access to networks. They monitor and control incoming and outgoing network traffic based on predetermined security rules, effectively creating a barrier between trusted internal networks and untrusted external networks.

By utilizing firewalls as part of a layered approach, organizations can significantly enhance their security posture. This is because firewalls can be complemented by other security measures, such as intrusion detection systems, antivirus software, and user education, each layer adding another avenue of protection. This multi-layered defense minimizes the likelihood of a successful attack, as compromising one layer does not ensure access to the next.

The other choices do not effectively represent the concept of a layered defense. Focusing solely on user permissions does not account for threats that could bypass these permissions, nor does unrestricted network access provide adequate protection against potential intrusions. Relying on a single antivirus solution also falls short, as it does not provide the comprehensive protection that multiple layers of security can offer.