300-420 Question 45
Single answerYou are tasked with designing an IPv6 migration strategy for a large enterprise network that currently runs IPv4. The network consists of multiple sites connected via MPLS, and there is a requirement to ensure uninterrupted service during the migration. Which of the following strategies would be most appropriate to achieve this goal?
- A
Dual Stack deployment
- B
NAT64 with DNS64
- C
IPv6 Rapid Deployment (6rd)
- D
Tunneling using GRE over IPv4
Show answer and explanation
Correct answer: A
Explanation
Dual Stack deployment is the most widely recommended and scalable IPv6 migration strategy for enterprise networks. It ensures that both IPv4 and IPv6 protocols can operate simultaneously, enabling a smooth transition without service interruptions. This approach aligns with the need for coexistence during the migration phase, especially in complex environments like multi-site MPLS networks.
- A. Correct.
Dual Stack deployment is the most appropriate strategy in this scenario. It allows IPv4 and IPv6 to coexist, ensuring uninterrupted service during the migration phase. Dual Stack also enables applications to communicate using either protocol seamlessly.
- B. Incorrect.
NAT64 with DNS64 translates IPv6 traffic to IPv4, which is useful for IPv6-only clients accessing IPv4 servers. However, it is not suitable for a large enterprise migration as it does not ensure the coexistence of both protocols across all systems.
- C. Incorrect.
IPv6 Rapid Deployment (6rd) is primarily used by service providers to deliver IPv6 over an IPv4 infrastructure quickly. It is not the most appropriate choice for an enterprise environment with interconnected sites.
- D. Incorrect.
Tunneling using GRE over IPv4 is a temporary solution for connecting isolated IPv6 networks over an IPv4 backbone. However, it is not scalable or ideal for an enterprise-wide migration strategy.