300-420 Question 47
Single answerAn enterprise network is preparing to migrate from IPv4 to IPv6 due to the exhaustion of IPv4 addresses. The organization operates a large number of legacy devices that do not support IPv6 natively. The network team wants to ensure a smooth transition while maintaining interoperability between IPv4 and IPv6 during the migration. Which IPv6 migration strategy should the team prioritize to meet these requirements?
- A
Dual-stack deployment
- B
IPv6 Rapid Deployment (6rd)
- C
NAT64 with DNS64
- D
Tunneling using GRE
Show answer and explanation
Correct answer: A
Explanation
The dual-stack deployment strategy is the most effective approach for enterprises migrating to IPv6 while maintaining interoperability during the transition. It allows devices to operate on both IPv4 and IPv6 simultaneously, ensuring full compatibility with legacy systems and enabling a gradual migration. Other strategies like NAT64 or tunneling address specific scenarios but do not provide the comprehensive coexistence required in mixed IPv4/IPv6 environments.
- A. Correct.
Dual-stack deployment allows for the simultaneous operation of both IPv4 and IPv6 on the same network infrastructure, ensuring interoperability and a smooth transition. This is the most comprehensive approach when dealing with legacy devices.
- B. Incorrect.
IPv6 Rapid Deployment (6rd) is a tunneling mechanism designed to quickly deploy IPv6 across an IPv4 infrastructure but does not directly address the need for interoperability between IPv4 and IPv6 during migration.
- C. Incorrect.
NAT64 with DNS64 facilitates IPv6-only devices to communicate with IPv4-only resources, but it is not suitable for environments where both protocols need to coexist during the migration phase.
- D. Incorrect.
Tunneling using GRE helps encapsulate IPv6 traffic within IPv4 packets, but it is primarily used for connecting isolated IPv6 networks over an IPv4 infrastructure rather than ensuring simultaneous protocol coexistence.