Multiple ChoiceBeginner 45s
Why negative caching helps
A cache penetration attack repeatedly requests IDs that do not exist. Why does caching a negative result help?
Options
- 1It short-circuits repeated misses by storing a 'not found' marker with a short TTL
- 2It compresses the repeated response payloads, so the marker shrinks bytes sent per miss
- 3It encrypts the lookup key on each miss, so attackers cannot enumerate valid IDs from query patterns
- 4It raises the cache hit ratio near 100%, since each store read is replaced by a negative marker lookup
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