Question 23

For the internal network to contact servers on the internet, NAT64 must be enabled.

NAT64 is essential for translating IPv6 addresses to IPv4 addresses, enabling communication between an IPv6-only network and IPv4 internet servers. This is crucial as the internet still comprises many IPv4 resources.

A) MPLS

MPLS (Multiprotocol Label Switching) is a technique used to enhance the speed and efficiency of network traffic management and is not specifically required for IPv6 to IPv4 connectivity. While it can be beneficial for overall network performance, it does not facilitate communication with IPv4 internet servers from an IPv6-only network.

B) NAT64

NAT64 is the correct choice as it provides the necessary translation between IPv6 and IPv4, allowing an IPv6-only network to access IPv4 resources on the internet. This functionality is critical for ensuring connectivity in a scenario where the internal network utilizes only IPv6 addressing.

C) GRE

GRE (Generic Routing Encapsulation) is a tunneling protocol used to encapsulate packets for transmission over a network. While it can be used in various networking scenarios, it does not directly address the need for translating between IPv6 and IPv4, making it inadequate for enabling internet access for an IPv6-only network.

D) Static routing

Static routing involves manually configuring routes in a network and, while important for directing traffic, it does not provide a mechanism for translating between IPv6 and IPv4 addresses. Therefore, it does not fulfill the requirement for an IPv6 network to communicate with IPv4 internet servers.

Conclusion

NAT64 is the only option that facilitates the necessary communication between an IPv6-only internal network and the IPv4 internet, making it the definitive correct answer. All other options fail to provide the required address translation capabilities, rendering them ineffective for the scenario presented.