In security, Common Body of Knowledge (CBK) is a comprehensive compilation of all the relevant subjects a security professional should be familiar with. CBK is organized by domain, gathered and annually updated by the International Information Systems Security Certification Consortium, otherwise known as (ISC)2.
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(ISC)2 uses the various domains of the CBK to test a certificate candidate's levels of expertise. For example, the CISSP certification covers eight domains from the CBK: security and risk management, asset security, security engineering, communications and network security, identity and access management, security assessment and training, security operations and software development security.