350-501 Question #302: Real Exam Question with Answer & Explanation

Question

What are two features of stateful NAT64? (Choose two.)

Options

• AIt uses address overloading.
• BIt provides 1:N translations, so it supports an unlimited number of endpoints.
• CIt requires IPv4-translatable IPv6 address assignments.
• DIt requires the IPv6 hosts to use either DHCPv6-based address assignments or manual address
• EIt provides 1:1 translation, so it supports a limited number of endpoints.

Explanation

Stateful NAT64 is a mechanism that allows IPv6 hosts to communicate with IPv4 hosts by performing address and port translation. Its key features include using address overloading and providing 1:N translations, enabling multiple IPv6 endpoints to share a limited pool of IPv4 addresses.

Common mistakes.

• C. While IPv6-translatable IPv6 address assignments (using prefixes like 64:ff9b::/96) are a fundamental part of the NAT64 architecture for IPv6 hosts to reach IPv4 destinations, this is more of an addressing prerequisite for the IPv6 clients and destination mapping, rather than a direct feature of the stateful translation process itself.
• D. Stateful NAT64 does not dictate how IPv6 hosts obtain their addresses; hosts can use SLAAC, DHCPv6, or manual configuration independently of the NAT64 mechanism.
• E. Stateful NAT64 primarily provides 1:N translations (overloading) to conserve IPv4 addresses. 1:1 translation is characteristic of stateless NAT64 or basic stateful NAT without overloading, which is not the common or primary feature of stateful NAT64 deployments.

Concept tested. Stateful NAT64 (NAPT64) features

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/nat-xe-3s-book/ipnat-64-stateful.html

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