300-320 Question #673: Real Exam Question with Answer & Explanation

The correct answer is C: NAT64. When applications lack native IPv6 support, translation mechanisms are required. NAT64 (C) operates at the network layer, translating IPv6 packets to IPv4 so that IPv6-only clients can reach IPv4-only applications without modifying those applications. SLB64 (D) is a server load b

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

When applications lack native IPv6 support, translation mechanisms are required. NAT64 (C) operates at the network layer, translating IPv6 packets to IPv4 so that IPv6-only clients can reach IPv4-only applications without modifying those applications. SLB64 (D) is a server load balancing technique that accepts IPv6 connections from clients and translates them to IPv4 when forwarding requests to IPv4-only backend servers. Both are translation-based workarounds. DNS64 (A) works alongside NAT64 for synthesizing AAAA records but is a DNS component, not a communication workaround by itself. ISATAP (B) tunnels IPv6 over IPv4 networks for IPv6 connectivity, not for supporting IPv4-only apps. DS-Lite (E) carries IPv4 traffic over IPv6 ISP infrastructure and does not address application-level IPv6 incompatibility.

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