Data Systems & Security Checkpoint

Check database indexing, storage trade-offs, cryptography, and layered security controls.

Scenario

A growing application must speed up queries without weakening how credentials and sensitive data are protected.

Question 1

What is a common benefit of a database index?

Fewer rows examined for selective queriesEvery write becomes freeAll data becomes encryptedTables no longer need storage

Question 2

What is a common cost of adding an index?

Extra storage and write maintenanceDNS stops workingQueries cannot use conditionsPasswords become reversible

Question 3

Which technique is appropriate for storing passwords for later verification?

A salted password hashPlain textA public URLBase64 encoding alone

Question 4

A full scan examines 10,000 rows while an indexed lookup examines 25. How many fewer rows are examined?

Your answerrows

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