  With the recognition of cyberspace as an operating domain, concerted effort
is now being placed on addressing it in the whole-of-domain manner found in
land, sea, undersea, air, and space domains. Among the first steps in this
effort is applying the standard supporting concepts of security, defense, and
deterrence to the cyber domain. This paper presents an architecture that helps
realize forward defense in cyberspace, wherein adversarial actions are repulsed
as close to the origin as possible. However, substantial work remains in making
the architecture an operational reality including furthering fundamental
research cyber science, conducting design trade-off analysis, and developing
appropriate public policy frameworks.
