SC-45(1)—Synchronization With Authoritative Time Source
>Control Description
a
Compare the internal system clocks ⚙organization-defined frequency with ⚙organization-defined authoritative time source; and
b
Synchronize the internal system clocks to the authoritative time source when the time difference is greater than ⚙organization-defined time period.
>Cross-Framework Mappings
>Supplemental Guidance
Synchronization of internal system clocks with an authoritative source provides uniformity of time stamps for systems with multiple system clocks and systems connected over a network.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies govern the implementation of synchronization with 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(1)?
Technical Implementation:
- •How is synchronization with authoritative time source technically implemented in your environment?
- •What systems, tools, or configurations enforce this protection requirement?
- •How do you ensure that synchronization with authoritative time source remains effective as the system evolves?
- •What network boundary protections are in place (firewalls, gateways, etc.)?
Evidence & Documentation:
- •What documentation demonstrates the implementation of SC-45(1)?
- •Can you provide configuration evidence or system diagrams showing this protection control?
- •What logs or monitoring data verify that this control is functioning correctly?
- •Can you provide network architecture diagrams and firewall rulesets?
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