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CompTIA Security+ study material · question 91 of 611
A client asks for a test that begins with no inside information about the environment. Which engagement type is this?
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Answer: D. An unknown-environment test
Unknown-environment testing starts with no documentation; known-environment testing starts with full information about the target.
Source: NIST SP 800-115 (NIST) — SP 800-115 § 5 Target Vulnerability Validation Techniques