AC-4(21): Physical or Logical Separation of Information Flows

Control Family:

Access Control

CSF v1.1 References:

Threats Addressed:


(Not part of any baseline)

Previous Version:

Control Statement

Separate information flows logically or physically using [Assignment: organization-defined mechanisms and/or techniques] to accomplish [Assignment: organization-defined required separations by types of information].

Supplemental Guidance

Enforcing the separation of information flows associated with defined types of data can enhance protection by ensuring that information is not commingled while in transit and by enabling flow control by transmission paths that are not otherwise achievable. Types of separable information include inbound and outbound communications traffic, service requests and responses, and information of differing security impact or classification levels.