Discussion
Consider the following statements about DNS time to live.
1. A lower value shortens the time a change takes to propagate.
2. A lower value increases query volume against the DNS service.
3. The value has no effect on failover speed.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are the direct trade: a shorter time to live propagates changes sooner but multiplies the queries, since every resolver must ask again more often. Statement 3 contradicts the first - failover speed *is* governed by the time to live, which is precisely why records intended for failover are given short values well before they are needed.
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