This CAS-004 practice question tests your understanding of security engineering and cryptography. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security analyst is configuring a TPM 2.0 for a new fleet of laptops. The requirement is to ensure that only authorized operating systems can boot and that any tampering with the boot process is detected. Which TPM feature should be used?
Secure boot
Why wrong: Secure boot only verifies digital signatures of boot components, not measurements.
Measured boot with attestation
Measured boot records boot measurements in PCRs; attestation allows verification of those measurements.
Sealed storage
Why wrong: Sealed storage protects data but does not measure boot.
Key attestation
Why wrong: Key attestation proves that a key was generated in a TPM, not boot integrity.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Measured boot with attestation
Measured boot records measurements of boot components in PCRs, and attestation allows a remote verifier to check these measurements. Secure boot only verifies signatures, not measurements. Sealed storage ties data to PCR values. Key attestation is for keys.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Secure boot
Why it's wrong here
Secure boot only verifies digital signatures of boot components, not measurements.
Measured boot with attestation
Why this is correct
Measured boot records boot measurements in PCRs; attestation allows verification of those measurements.
Related concept
Static NAT maps one inside address to one outside address.
Sealed storage
Why it's wrong here
Sealed storage protects data but does not measure boot.
Key attestation
Why it's wrong here
Key attestation proves that a key was generated in a TPM, not boot integrity.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
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FAQ
Security Engineering and Cryptography — This question tests Security Engineering and Cryptography — Static NAT maps one inside address to one outside address..
The correct answer is: Measured boot with attestation — Measured boot records measurements of boot components in PCRs, and attestation allows a remote verifier to check these measurements. Secure boot only verifies signatures, not measurements. Sealed storage ties data to PCR values. Key attestation is for keys.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jul 4, 2026
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