Final answer:
The best approach to increase enterprise resilience during future attacks involving latent vulnerabilities in cryptographic implementations and VPN concentrators is to implement appliances and software from diverse manufacturers. Segmenting remote VPN users logically from the production LAN is also a good strategy. Upgrading the cryptographic ciphers used on the VPN concentrators can improve security.
Step-by-step explanation:
The best approach to increase enterprise resilience during future attacks involving latent vulnerabilities in cryptographic implementations and VPN concentrators is to implement appliances and software from diverse manufacturers. By using products from different manufacturers, the company can reduce the risk of a single vulnerability affecting all their systems. This approach ensures that if one manufacturer's product is compromised, the others can still provide security.
Segmenting remote VPN users logically from the production LAN (option B) is also a good strategy, as it limits the potential damage that attackers can do by compromising a remote user's device.
Upgrading the cryptographic ciphers used on the VPN concentrators (option D) can improve security, but it should be done in combination with the other approaches mentioned above to ensure comprehensive resilience.