Some 40 million RSA SecurID tokens must be replaced due to the breach. The implementation of two-factor authentication varies from organization to organization. For most organizations, there are key areas where two factor solutions should be utilized, and others where its simply a burden with little or no added benefit. Extending internal authentication credentials to the edge of the network is not ideal, but is becoming more common as organizations are forced to support new mobile devices that dont support certificates.”]
Source: https://www.darkreading.com/analytics/tech-insight-tips-for-implementing-two-factor-authentication