7d7a304b__Storm_Center_Diary_2012_10_06__Purpose
[ID] CIP-002-4a [Description] Cyber Security - Critical Cyber Asset Identification [Purpose] 
Its purpose is to require the identification and documentation of the Critical Cyber Assets associated with the Critical Assets that support the reliable operation of the Bulk Electric System. It must include at least one of the following characteristics: The Cyber Asset uses a routable protocol to communicate outside the Electronic Security Perimeter; or, The Cyber Asset uses a routable protocol within a control center; or, The Cyber Asset is dial-up accessible.
InfoSec Handlers Diary Blog - Internet Storm Center Diary 2012-10-06
Purpose