3V0-25.25: VMware Cloud Foundation 9.0 Networking Dumps
Free VMware 3V0-25.25 Exam Dumps
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Question No: 1
MultipleChoice
An administrator is enabling IPv6-to-IPv4 communication for workloads hosted in an NSX environment. The workloads use IPv6-only addressing, but the external systems they must reach are IPv4-only. To provide this translation service, the administrator decides to configure NAT64. Which two following characteristics about NAT64 are true? (Choose two.)
Options
Answer B, DExplanation
Comprehensive and Detailed 250 to 350 words of Explanation From VMware Cloud Foundation (VCF) documents:
As organizations modernize their infrastructure with VCF 5.x and 9.0, IPv6 adoption becomes more prevalent. NAT64 is a critical transition technology that allows IPv6-only hosts to communicate with IPv4-only resources by translating the packet headers.
In NSX, NAT64 is a stateful 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 services must 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 is supported 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 an Active-Standby configuration on either a Tier-0 or Tier-1 gateway to properly facilitate the translation between the IPv6 workloads and the IPv4 external world.
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