300-420 Question 57
Select 2Your organization is transitioning from an IPv4-only network to a dual-stack IPv4/IPv6 environment. You are tasked with designing a solution to ensure seamless communication between IPv4 and IPv6 endpoints during the migration period. Which of the following technologies can be used to achieve this while maintaining application functionality across boundaries?
- A
NAT64
- B
Dual-Stack Lite (DS-Lite)
- C
IPv6 Rapid Deployment (6rd)
- D
DNS64
- E
ISATAP
Show answer and explanation
Correct answers: A, D
Explanation
To enable seamless communication between IPv4 and IPv6 endpoints, technologies like NAT64 and DNS64 are essential. NAT64 translates network layer packets between IPv6 and IPv4, while DNS64 modifies DNS responses to support this translation. Other technologies like DS-Lite, 6rd, and ISATAP address different use cases and do not directly provide the translation required for crossing IPv4/IPv6 boundaries.
- A. Correct.
NAT64 is a translation mechanism that allows IPv6-only devices to communicate with IPv4-only devices by translating IPv6 packets into IPv4 packets and vice versa. This is critical for crossing IPv4/IPv6 boundaries.
- B. Incorrect.
Dual-Stack Lite (DS-Lite) is designed for IPv4 connectivity over an IPv6 infrastructure but does not directly address IPv4/IPv6 translation for communication between endpoints.
- C. Incorrect.
IPv6 Rapid Deployment (6rd) is a mechanism for enabling IPv6 over an IPv4 network and does not handle IPv4/IPv6 translation at the boundary.
- D. Correct.
DNS64 works alongside NAT64 to modify DNS responses, allowing IPv6-only devices to resolve and communicate with IPv4-only hosts. It is a key component for ensuring application functionality across boundaries.
- E. Incorrect.
ISATAP is a tunneling mechanism designed for IPv6 communication over an IPv4 network and does not provide translation between IPv4 and IPv6.