Exam 300-420 topic 1 question 202 discussion

stateless NAT64 is 1:1 mapping and we have 2000 hosts, limited to a subnet /22 which equals to 1024-2 hosts, we need to use stateful NAT64 which is 1:* mapping

You must use Many-to-one translation, because /22 only supports 1022 hosts while you have 2000 hosts at Corporate site.

D Stateful Nat64 is correct. It cannot be stateless because stateless is for 1 to 1 mapping and a /22 only has 1,022 usable hosts which won't cover the 2000 IPv6 addresses. https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/217208-understanding-nat64-and-its-configuratio.html

Stateless translation is appropriate when a NAT64 translator is used in front of IPv4-only servers to allow them to be reached by remote IPv6-only clients. Stateful translation is suitable for deployment at the client side or at the service provider, allowing IPv6-only client hosts to reach remote IPv4-only nodes.

B since it´s a specific specific subnet

I believe the correct answer is B: B. Stateless NAT64 - While not the ideal solution, this option could still provide some level of IPv6-to-IPv4 address translation. However, without maintaining session state, it may not properly support many-to-one address translations required for internet connectivity. Some applications and services might not work as expected, but it could potentially provide a basic level of connectivity between the IPv6 corporate network and the IPv4 internet.

Correct is D

Correct

sorry statefull nat64 is D so D correct answer

I think A correct answer . statefull nat64 - all subnet to do source nat with one public IP