September 11, 2001, Terrorist Incidents Lessons Learned: New Approaches Needed for Disaster Recovery and Business Continuity Planning "Survivability" is a different way of looking at normal disaster recovery plans. Domain Name System: Eliminating Single Points of Failure This concentrates on the provisioning of authoritative DNS servers, but don't forget about the other half of DNS, resolvers. http://www.nipc.gov/publications/highlights/2001/highlight-01-11.pdf