Dual Stack for IPv4/IPv6 CDN Service Delivery

N10-009 By islever Editorial Last updated

Given a scenario, implement IP v4 and IP v6 network services.

Short answer

C Implement dual stack so the CDN provider runs IPv4 and IPv6 protocol stacks concurrently and serves clients over either or both without translation.

Question

A CDN provider needs to implement a solution that delivers services to customers using IPv4, IPv6, or both to ensure interoperability. Which of the following technologies is the most appropriate for this requirement?
  1. Quality of service
  2. Automatic private IP addressing
  3. Dual stack Correct Answer
  4. Stateless address autoconfiguration

Key Takeaways

It tests the boundary between native dual-stack coexistence and IPv6-only addressing or transition mechanisms, with the trap being to choose SLAAC simply because IPv6 is mentioned.

This question tests how a CDN provides native IPv4 and IPv6 service, and the answer is dual stack (C). Dual stack runs both protocol stacks concurrently rather than translating or autoconfiguring addresses.

Common mistake: The most tempting wrong answer is D, SLAAC, because it is IPv6-related; however, SLAAC only lets a host derive an IPv6 address and does not make a CDN serve IPv4, IPv6, or both.

Expert Analysis

The requirement is native coexistence, not conversion. The CDN provider must serve customers who arrive over IPv4, IPv6, or both. That is the definition of dual stack: the servers, load balancers, and network devices run IPv4 and IPv6 protocol stacks at the same time. A client can use either address family, and no translation gateway is inserted into the path.

Where the boundary sits. The commonly confused boundary is between running both protocols natively and using IPv6 transition or address-configuration tools. Dual stack is on the native side: both stacks are present, and routing and DNS can return A and AAAA records as appropriate. Translation with NAT64 or tunneling sits on the conversion side, because one protocol is carried or mapped to reach the other. Address autoconfiguration sits on the host-configuration side, not the service-delivery side.

Why the distractors fail. D, SLAAC, is IPv6-related but only lets a host form an IPv6 address from router advertisements; it does not create an IPv4 stack or make the CDN answer both families. B, APIPA, is an IPv4 link-local fallback when DHCP fails and has nothing to do with planned dual-protocol service. A, QoS, prioritizes traffic and cannot provide IPv4/IPv6 interoperability. A comment on this item captures the decisive point: dual stack means devices and servers run both protocol stacks simultaneously, allowing IPv4, IPv6, or both without protocol translation.

Verdict. C is correct. The “or both” wording is the clue that the CDN needs concurrent native stacks, not address autoconfiguration or quality-of-service policy.

Official Reference

These links open the official vendor documentation in a new tab.

Exam Strategy

For IPv4/IPv6 coexistence questions, first classify each option by role: native dual-stack delivery, address autoconfiguration, translation or tunneling, or traffic policy. If the stem says the service must support IPv4, IPv6, or both, look for a native both-stacks answer; if it says an IPv6-only host must reach an IPv4-only server, translation becomes relevant. Eliminate options that merely assign addresses or prioritize packets. This role-based elimination is faster and safer than choosing the option with the most IPv6 keywords.

Frequently Asked Questions

Why is dual stack better than NAT64 for this CDN requirement?

Dual stack lets clients use native IPv4 or IPv6 without translation, while NAT64 is for IPv6-only networks reaching IPv4 and adds translation complexity. The requirement is to serve both protocols, not to translate between them.

Does stateless address autoconfiguration provide dual-stack service?

No. SLAAC only configures IPv6 addresses on hosts; it does not run an IPv4 stack or make a CDN answer IPv4 and IPv6 clients.

What role does QoS play in IPv4/IPv6 coexistence?

QoS prioritizes and manages traffic; it does not provide IPv6 connectivity or dual-stack delivery. It is unrelated to this requirement unless a separate performance policy is needed.

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Community Votes

C
100%

100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 1 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 1

  1. ERB14 👍 1 Answered C
    Dual stack: Running dual stack means the network devices and servers run both IPv4 and IPv6 protocol stacks simultaneously. This allows the CDN provider to seamlessly serve clients connecting via IPv4, IPv6, or both without requiring protocol translation.

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