For example, the inclusion of inline Network Virtual Appliances (NVA) for Next-Generation Firewall (NGFW) capabilities, such as deep packet inspection, will introduce a significant performance penalty, additional operational complexity, and a reliability risk if scalability and recovery operations are not closely aligned with that of the application. It's also important to note that there are often significant trade-offs associated with a hardened security posture, particularly with respect to performance, operational agility, and in some cases reliability. So, the application must be fully protected against threats intended to directly or indirectly compromise application reliability to be truly mission critical in nature. How an application mitigates those attack vectors, such as SlowLoris will impact the overall reliability. For example, successful Denial-Of-Service (DDoS) attacks are known to have a catastrophic impact on availability and performance. Given that the primary focus of a mission-critical design is to maximize reliability so that the application remains performant and available, the security considerations and recommendations applied within this design area will focus on mitigating threats with the capacity to impact availability and hinder overall reliability.
Security is a one of the foundational design principles and also a key design area that must be treated as a first-class concern within the mission-critical architectural process.
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