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DNS and HTTPS: Diagnose an Unreachable Site
DNS and HTTPS: Diagnose an Unreachable Site
Answer 15 questions randomly selected from a bank of 40. Choose one best answer per question. Pass with 12 correct answers. Original professional practice, not an official certification exam.
1 of 15
A new record exists on the authoritative server but an external resolver still returns the old answer. What can explain it?
A successful TLS renewal automatically replaces every cached address
The new authoritative TTL retroactively rewrites the old cached record
A cached answer whose TTL has not expired
The origin's HTTP cache necessarily changes the resolver's A answer
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