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Dns servfail is retryable while nxdomain is terminal · case 04

Dns servfail is retryable while nxdomain is terminal.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case contract

Bounded offline decision model: dns servfail is retryable while nxdomain is terminal. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.

Why this case matters

This deterministic dns resolution model isolates the dns-servfail-is-retryable-while-nxdomain-is-terminal policy at a network component boundary.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fixture 3	`true`	`false`	Failed

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