300-320 Question #670: Real Exam Question with Answer & Explanation

The correct answer is C: NAT64. (C) NAT64 translates IPv6 packets to IPv4 at the network boundary, allowing IPv6 clients to reach IPv4-only applications/servers transparently. It is a key workaround for applications that lack IPv6 support. (D) SLB64 (Server Load Balancing 64) is a load-balancing approach where

Question

Which workarounds can be implemented to allow IPv6 communication with applications that do not have IPv6 support? (Select two.)

Options

ADNS64
BISATAP
CNAT64
DSLB64
EDS-LITE

Explanation

(C) NAT64 translates IPv6 packets to IPv4 at the network boundary, allowing IPv6 clients to reach IPv4-only applications/servers transparently. It is a key workaround for applications that lack IPv6 support. (D) SLB64 (Server Load Balancing 64) is a load-balancing approach where the load balancer accepts IPv6 connections from clients and proxies them as IPv4 connections to back-end servers that do not support IPv6 - effectively hiding the IPv6-to-IPv4 translation at the application delivery layer. (A) DNS64 alone only synthesizes AAAA records; it must be paired with NAT64 to complete communication. (B) ISATAP is an intra-site IPv6-over-IPv4 tunneling mechanism, not a workaround for IPv4-only applications. (E) DS-Lite tunnels IPv4 over IPv6 for ISP use cases and does not address IPv4-only application compatibility.

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