An administrator is enabling IPv6-to-IPv4 communication for workloads hosted in an NSX environment.

Comprehensive and Detailed 250 to 350 words of Explanation From VMware Cloud Foundation (VCF) documents:

As organizations modernize their infrastructure withVCF 5.x and 9.0, IPv6 adoption becomes more prevalent.NAT64is a critical transition technology that allows IPv6-only hosts to communicate with IPv4-only resources by translating the packet headers.

In NSX, NAT64 is astateful service. Stateful services in the NSX architecture require a centralized point of processing to maintain the session state table. Because of this requirement, any gateway (Tier-0 or Tier-1) providing NAT64 servicesmust be configured in Active-Standby high availability mode. In Active-Active mode, asymmetric return traffic could hit a different Edge node that does not have the session information, causing the translation to fail. This is a fundamental design constraint for stateful NAT in NSX.

Furthermore, VMware NSX documentation specifies that NAT64 is a flexible service that can be implemented at multiple tiers of the logical routing hierarchy. It issupported on both Tier-0 and Tier-1 gateways. The choice of where to place the NAT64 service depends on the design requirements: placing it on the Tier-1 gateway allows for tenant-specific translation and offloads the Tier-0, while placing it on the Tier-0 provides a centralized translation point for all connected segments.

Option A is incorrect because NAT64 in NSX is stateful, not stateless. Option C is incorrect because it is not limited to Tier-1. Option E is incorrect because Active-Active mode does not support the stateful nature of the NAT64 engine. Consequently, the correct architecture requires anActive-Standbyconfiguration on either aTier-0 or Tier-1gateway to properly facilitate the translation between the IPv6 workloads and the IPv4 external world.