None
Maintenance activities conducted by individuals communicating through an external network (e.g., the Internet).
Source(s):
NIST SP 800-171 Rev. 2
NIST SP 800-53 Rev. 4
under Remote Maintenance
NIST SP 800-171 Rev. 1
[Superseded]
Maintenance activities conducted by individuals communicating external to an information system security perimeter.
Source(s):
NIST SP 800-18 Rev. 1
under Remote Maintenance
NIST SP 800-82 Rev. 2
under Remote Maintenance