External Telecommunications Services
Parent: SC-7
Description
a. Implement a managed interface for each external telecommunication service; b. Establish a traffic flow policy for each managed interface; c. Protect the confidentiality and integrity of the information being transmitted across each interface; d. Document each exception to the traffic flow policy with a supporting mission or business need and duration of that need; e. Review exceptions to the traffic flow policy [organization-defined parameter] and remove exceptions that are no longer supported by an explicit mission or business need; f. Prevent unauthorized exchange of control plane traffic with external networks; g. Publish information to enable remote networks to detect unauthorized control plane traffic from internal networks; and h. Filter unauthorized control plane traffic from external networks.
Mapped SPARTA techniques
67 techniques
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Cite as SafeMode Space, nist-80053-rev5 SC-7(4).