300-420 Question #104: Real Exam Question with Answer & Explanation

The correct answer is C: dual stack. To support applications that dynamically choose between IPv4 and IPv6 based on DNS requests, the dual stack migration strategy is most appropriate.

Advanced Addressing and Routing Solutions

Question

An architect is creating a migration strategy for a large organization in which the choice made by the application between IPv6 and IPv4 is based on the DNS request. Which migration strategy does the architect choose?

Options

AAFT for public web presence
Bhost-initiated tunnels
Cdual stack
Dsite-to-site IPv6 over IPv4 tunnels

Explanation

To support applications that dynamically choose between IPv4 and IPv6 based on DNS requests, the dual stack migration strategy is most appropriate.

Common mistakes.

A. AFT for public web presence involves translation between IPv4 and IPv6, not a direct application choice based on DNS.
B. Host-initiated tunnels are a mechanism for encapsulating IPv6 over IPv4, not a comprehensive migration strategy for application protocol selection.
D. Site-to-site IPv6 over IPv4 tunnels are a specific tunneling method, not a general strategy enabling applications to choose protocols via DNS.

Concept tested. IPv4/IPv6 migration strategies, dual stack operation

Reference. https://learn.microsoft.com/en-us/windows-server/networking/ipv6/ipv6-transition-technologies

Topics

#IPv6 Migration#Dual Stack#DNS Resolution#IPv6 Architecture

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