Federated autonomic Network Access Control
Simon N. Foley, William M. Fitzgerald, Wayne Mac Adams · 2011
Network Access Controls (NAC) are widely used to provide endpoint security typically complementing existing application-based security controls. NAC security mechanisms, for instance firewalls, are routinely prescribed as requirements for compliance to security standards such as PCI-DSS and ISO 27000. However, the effectiveness of a NAC configuration may be hampered by poor understanding and/or management of the overall security configuration, which may in turn, unnecessarily expose the enterprise to known security threats. New threats and/or service requirements often result in firefighting by ad-hoc modification to an already large and complex configuration. This complexity is further compounded by the diverse range of NAC mechanisms used to secure an enterprise; ranging from firewalls and proxies to NAC-style controls within applications themselves. As a consequence, it can be difficult to ensure that the current NAC configuration is effective, that is, it sufficiently mitigates threats while providing necessary access to services. Ensuring ongoing best-practice NAC administration can be costly as it requires expert knowledge in a rapidly changing field.