Which of the two following characteristics about NAT64 are true? (Choose two.)

NAT64 is a stateful translation mechanism that allows IPv6-only clients to communicate with IPv4-only servers. According to VMware's official documentation, this service can be configured on both Tier-0 and Tier-1 gateways. Because NAT64 is a stateful, centralized service, it runs on a single Edge Node at a time. To ensure service continuity and proper state handling during a failover event, the gateway (whether Tier-0 or Tier-1) where NAT64 is enabled must be configured in an active-standby high availability (HA) mode. This configuration ensures that translation states are maintained consistently.

A. NAT64 is a stateful service. Active-active mode is used for stateless services like routing, not for stateful services that require session state to be maintained on a single active node.
B. This statement is incorrect because NAT64 is inherently stateful. It must maintain a mapping of IPv6 source addresses and ports to translated IPv4 addresses and ports for return traffic.
D. This is incorrect as official documentation confirms that the NAT64 service is supported and can be configured on both Tier-0 and Tier-1 gateways.

1. VMware NSX 4.1 Administration Guide

"NAT64" section.

Reference for C: The documentation states

"NAT64 is supported on Tier-0 and Tier-1 gateways."

Reference for E: The guide explains

"For a Tier-0 gateway

the NAT64 service is centralized on a single edge node. For a Tier-1 gateway

the NAT64 service is centralized on a single edge node. Therefore

the Tier-0 or Tier-1 gateway must be in active-standby mode."

Reference for A & B: The same section explicitly states

"NAT64 is a stateful translation." This confirms the requirement for active-standby mode (invalidating A) and contradicts the claim that it is stateless (invalidating B).

Source: VMware Documentation Portal

VMware NSX 4.1 Administration Guide

Chapter: NAT

Section: NAT64. (Accessible via docs.vmware.com)

2. VMware NSX-T Data Center 3.2 Design Guide

"NAT64" section.

Reference for C & E: This design guide reiterates the same principles: "NAT64 is a stateful service that can be enabled on a T0 or T1 gateway in Active/Standby." This confirms support on both gateway tiers and the active-standby requirement.

Source: VMware NSX-T Reference Design Guide

Page 131

Section: NAT64. (Publicly available PDF from VMware).