SC-45(2)—Secondary Authoritative Time Source
>Control Description
a
Identify a secondary authoritative time source that is in a different geographic region than the primary authoritative time source; and
b
Synchronize the internal system clocks to the secondary authoritative time source if the primary authoritative time source is unavailable.
>Supplemental Guidance
It may be necessary to employ geolocation information to determine that the secondary authoritative time source is in a different geographic region.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies govern the implementation of secondary authoritative time source?
- •How are system and communications protection requirements defined and maintained?
- •Who is responsible for configuring and maintaining the security controls specified in SC-45(2)?
Technical Implementation:
- •How is secondary authoritative time source technically implemented in your environment?
- •What systems, tools, or configurations enforce this protection requirement?
- •How do you ensure that secondary authoritative time source remains effective as the system evolves?
Evidence & Documentation:
- •What documentation demonstrates the implementation of SC-45(2)?
- •Can you provide configuration evidence or system diagrams showing this protection control?
- •What logs or monitoring data verify that this control is functioning correctly?
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