300-420 Question 58
Select 3You are tasked with designing a network that supports seamless communication between IPv4-only and IPv6-only devices. The organization has chosen to use NAT64 for IPv4/IPv6 translation. What must be considered when designing the boundaries for this translation mechanism?
- A
The NAT64 device must be placed at the boundary where IPv4-only devices communicate with IPv6-only devices.
- B
DNS64 is required for NAT64 to resolve IPv4 addresses to IPv6 addresses.
- C
NAT64 translation requires all IPv6-only devices to have dual-stack capabilities.
- D
The NAT64 boundary must account for traffic flows and avoid asymmetric routing.
- E
NAT64 only supports static mapping and does not allow dynamic translation.
Show answer and explanation
Correct answers: A, B, D
Explanation
NAT64 is a mechanism for enabling communication between IPv4-only and IPv6-only environments. When designing boundaries for NAT64, it is essential to place the translation device at the point where communication between these networks occurs. DNS64 is often required to synthesize IPv6 addresses from IPv4 DNS records, ensuring seamless translation. Additionally, traffic flows should be carefully analyzed to avoid asymmetric routing, which can cause operational issues. NAT64 supports both static and dynamic mappings, making it a flexible solution for such scenarios.
- A. Correct.
Correct. NAT64 operates at the boundary where IPv4-only devices communicate with IPv6-only devices, as it translates between the two protocols.
- B. Correct.
Correct. DNS64 is a critical component in NAT64 deployments, as it synthesizes IPv6 addresses from IPv4 DNS records to facilitate communication.
- C. Incorrect.
Incorrect. NAT64 does not require IPv6-only devices to have dual-stack capabilities; it is specifically designed to interconnect IPv4-only and IPv6-only environments.
- D. Correct.
Correct. Proper boundary placement for NAT64 must consider traffic flows to avoid asymmetric routing, which can lead to connectivity or performance issues.
- E. Incorrect.
Incorrect. NAT64 supports both static and dynamic translation, allowing flexibility in mapping IPv4 and IPv6 addresses.