A customer with an IPv4 only network topology wants to enable IPv6 connectivity while preserving the IPv4 topology services.
The customer plans to migrate IPv4 services to the IPv6 topology, then decommission the IPv4 topology.
Which topology supports these requirements?
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A. B. C. D.A.
The correct answer is A. Dual Stack.
Dual Stack is a topology that allows for both IPv4 and IPv6 traffic to coexist on the same network. In this topology, hosts and devices have both IPv4 and IPv6 addresses and can communicate using either protocol. This allows for a smooth transition from IPv4 to IPv6 without disrupting existing services.
With dual stack, the customer can enable IPv6 connectivity without affecting the existing IPv4 services. They can then gradually migrate their IPv4 services to the IPv6 topology and eventually decommission the IPv4 topology when they no longer need it.
The other options are not suitable for the customer's requirements:
B. 6VPE (IPv6 Virtual Private Network Provider Edge) is a technology that enables IPv6 connectivity over MPLS VPNs. It is not relevant to the customer's requirement of preserving the IPv4 topology services.
C. 6to4 is a tunneling mechanism that allows IPv6 packets to be encapsulated and sent over an IPv4 network. It is not a suitable topology for the customer's requirement of preserving the IPv4 topology services.
D. NAT64 is a technology that allows IPv6-only hosts to communicate with IPv4-only hosts by translating IPv6 packets to IPv4 packets and vice versa. While it can provide IPv6 connectivity, it does not preserve the IPv4 topology services as the IPv4 network is not directly accessible.
Therefore, the correct topology that supports the customer's requirements is dual stack.