What is the primary reason for developing an enterprise security architecture?

Developing an enterprise security architecture is primarily about aligning security strategies between different functional areas and external entities. This alignment ensures that security measures are not siloed but are integrated across the organization, facilitating better communication, cooperation, and consistency in security policies and practices.

When security strategies are aligned, all parts of the organization—such as IT, HR, compliance, and finance—work together towards common security objectives. This holistic approach allows for a more comprehensive understanding and management of risks, creating a unified defense that can more effectively respond to both internal and external security challenges. Moreover, aligning security strategies with external entities, such as partners and suppliers, helps ensure that third-party security practices complement and enhance the organization's overall security posture.

In contrast, aspects like building barriers between IT systems or focusing solely on external threats do not capture the broader function of an enterprise security architecture, which encompasses strategic alignment and integration across all areas of an organization.