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300-420 · Question #225

An architect must design an IPv6 migration solution for a corporation with remote offices to support: - The customer has IPv4 peering with their service provider. - IPv6 users need access to IPv4…

The correct answer is D. dual-stack. Given the requirements for IPv6 users to access both IPv4 and IPv6 resources, existing IPv4 peering, and a phased migration, a dual-stack solution is the most appropriate IPv6 migration strategy.

Advanced Addressing and Routing Solutions

Question

An architect must design an IPv6 migration solution for a corporation with remote offices to support:

  • The customer has IPv4 peering with their service provider.
  • IPv6 users need access to IPv4 and IPv6 resources.
  • Existing content providers will migrate to IPv6 in the next two

years.

  • Users will be migrated in a phase-by-phase approach.

Which migration solution must the architect choose?

Options

  • ANAT46
  • Btunneling
  • CNAT64
  • Ddual-stack

How the community answered

(44 responses)
  • A
    7% (3)
  • B
    18% (8)
  • C
    5% (2)
  • D
    70% (31)

Why each option

Given the requirements for IPv6 users to access both IPv4 and IPv6 resources, existing IPv4 peering, and a phased migration, a dual-stack solution is the most appropriate IPv6 migration strategy.

ANAT46

NAT46 translates IPv4 to IPv6, which is not the primary solution for IPv6 users needing access to IPv4 resources, nor for a gradual, coexisting migration.

Btunneling

Tunneling solutions encapsulate IPv6 over IPv4 or vice versa, but they do not inherently provide direct access for IPv6 users to IPv4 resources in a general enterprise context and are often considered temporary mechanisms.

CNAT64

NAT64 translates IPv6 to IPv4, allowing IPv6-only clients to access IPv4-only servers, but it requires DNS64 and doesn't directly address the need for users to access both IPv4 and IPv6 resources without translation for the latter.

Ddual-stackCorrect

Dual-stack allows network devices and applications to simultaneously support both IPv4 and IPv6 protocols. This is ideal for a phased migration, enabling IPv6-enabled users to access both existing IPv4 resources and new IPv6 services seamlessly without requiring complex translation mechanisms for all communications.

Concept tested: IPv6 migration strategy - dual-stack

Source: https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ipv6-for-ip-ngn/white-paper-c11-730691.html

Topics

#IPv6 migration#Dual-stack#Network transition#IPv6 addressing

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