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Exam 300-420 Topic 13 Question 273 Discussion

Actual exam question for Cisco's 300-420 exam
Question #: 273
Topic #: 13
A customer with an IPv4 only network topology wants to enable IPv6 connectivity while preserving the IPv4 topology services. The customer plans to migrate IPv4 services to the IPv6 topology, then decommission the IPv4 topology. Which topology supports these requirements?

Suggested Answer: A Vote an answer

Dual stack is the migration topology that supports IPv6 while preserving existing IPv4 services during the transition. In a dual-stack design, hosts and network devices run IPv4 and IPv6 in parallel, allowing applications and services to move gradually from IPv4 to IPv6 without forcing an immediate cutover. That matches the customer's plan: keep the current IPv4 topology and services, introduce IPv6 connectivity, migrate services, and eventually decommission the IPv4 topology. 6VPE is used to carry IPv6 VPN routes across an MPLS IPv4 provider core, which is a service-provider VPN use case rather than a general enterprise migration topology. 6to4 is an automatic tunneling mechanism and is not appropriate as a stable enterprise migration plan. NAT64 enables IPv6-only clients to reach IPv4 resources through translation, but it does not preserve the complete IPv4 topology while services migrate. Cisco migration guidance treats dual stack as the cleanest operational model when infrastructure supports both protocols, because it avoids translation side effects and allows DNS and application behavior to determine which protocol is used.

by Leif at Aug 21, 2026, 07:00 AM

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Here are all the actual test exam dumps for IT exams. Most people prepare for the actual exams with our test dumps to pass their exams. So it's critical to choose and actual test pdf to succeed.

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