Networks often become unmanageable and rapidly get out of control. An unmanageable network is insecure. The Manageable Network Plan is a series of milestones to take an unmanageable and insecure network and make it manageable, more defensible, and more secure. It provides overall direction, offers suggestions, calls out crucial security tips, and gives references to books, Web resources, and tools.
Source: National Security Agency Information Assurance Directorate Web Pages at www.nsa.gov - https://www.nsa.gov/ia/_files/vtechrep/ManageableNetworkPlan.pdf
