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CAS-004 Practice Question: Is designing a secure boot process for embedded…
A security engineer is designing a secure boot process for embedded devices. Which component is responsible for verifying the signature of the bootloader before execution?
⚠ Common exam trap
CASP+ often tests the distinction between the component that performs the verification (RoT) and the process or policy that uses it (Secure Boot), leading candidates to mistakenly choose 'Secure Boot' as the verifying component.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Root of trust (RoT)
The root of trust (RoT) is the immutable hardware or firmware component that anchors the secure boot chain. It is the first code executed on power-on and is responsible for verifying the digital signature of the bootloader before allowing it to run. Without a trusted RoT, the entire boot process lacks a cryptographically verifiable starting point.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Secure Boot
Why it's wrong here
Secure Boot is the process enabled by the RoT; it is not the component itself.
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Root of trust (RoT)
Why this is correct
RoT is the immutable hardware or code that establishes the first link in the chain of trust by verifying the bootloader.
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Trusted Platform Module (TPM)
Why it's wrong here
TPM stores measurements and keys but does not directly verify bootloader signatures.
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UEFI firmware
Why it's wrong here
UEFI firmware may implement Secure Boot, but the initial trust anchor is separate.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAS-005 exam.