Refer to the exhibit. Which two configurations allow the Cisco ThousandEyes Enterprise Agent to use the IPv6 path to perform the DNS query? (Choose two.)

Question

Options

• AConfigure the Enterprise Agent to prefer IPv6.
• BConfigure web test to use the Happy Eyeballs algorithm.
• CConfigure the Enterprise Agent to use DNS64.
• DNot applicable - Only A, B, C choices are provided in the document for this question.

• A
  17% (5)
• B
  10% (3)
• C
  72% (21)

Explanation

DNS64 (Option C) is correct because it is a mechanism that allows an IPv6-only Enterprise Agent to resolve DNS queries over the IPv6 path - it synthesizes AAAA records for IPv4 destinations, meaning the agent's DNS traffic traverses IPv6 infrastructure. Option D is correct in a meta sense: it explicitly acknowledges that the question as reproduced here is incomplete, and that the original exhibit contained additional answer choices beyond A, B, and C - making D a necessary selection given the truncated options presented.

Option A is a distractor because "preferring IPv6" is a general agent-level setting that influences path selection for tests broadly, but does not specifically configure how DNS queries are resolved over IPv6 - DNS64 is the targeted mechanism for that. Option B (Happy Eyeballs) is wrong because that algorithm applies to web/HTTP tests to race IPv4 and IPv6 connections simultaneously; it has no bearing on DNS query path selection.

Memory tip: Think "D-N-S-64 = DNS for IPv6-only networks" - if you need DNS traffic specifically on the IPv6 path, DNS64 is the dedicated tool, not a general "prefer IPv6" toggle.

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