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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

Your organization must connect its on-premises data center to an Amazon VPC using an IPsec site-to-site VPN. The traffic path crosses one or more upstream routers that perform network address translation (NAT). To ensure the tunnel still provides confidentiality and integrity across these devices, which IPsec configuration must you enable on both VPN endpoints?

  • Replace Encapsulating Security Payload with Authentication Header (AH) to tolerate header changes

  • Use IPsec transport mode instead of tunnel mode to bypass NAT devices

  • Enable IPsec NAT Traversal (encapsulate ESP in UDP port 4500 while using tunnel mode)

  • Disable Perfect Forward Secrecy in IKE Phase 2 to prevent rekeying conflicts with NAT

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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