SA-9 (2) External Information System Services | Identification Of Functions / Ports / Protocols / Services
The organization requires providers of [Assignment: organization-defined external information system services] to identify the functions, ports, protocols, and other services required for the use of such services.
Applicable CNSSI 1253 Baselines
Confidentiality
- L
- M
- H
Integrity
- L
- M
- H
Availability
- L
- M
- H
Supplemental Guidance
Information from external service providers regarding the specific functions, ports, protocols, and services used in the provision of such services can be particularly useful when the need arises to understand the trade-offs involved in restricting certain functions/services or blocking certain ports/protocols.