Quick Answer
The answer is to disable Secure Boot in the UEFI settings. When Secure Boot is enabled, the system only allows booting from software that has a valid digital signature recognized by the firmware, and many USB diagnostic tools or bootable drives lack this signature, causing the system to skip the USB and boot from the internal SSD instead. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of UEFI boot security and boot order configuration—a common trap is that technicians first check the boot order, but the real issue is often Secure Boot blocking unsigned media. Remember, if your USB boot is not working and Secure Boot is enabled, the fix is to disable Secure Boot temporarily, then re-enable it after diagnostics. A helpful memory tip: "Secure Boot signs the line, so unsigned drives won't shine."
This 220-1201 practice question tests your understanding of bios / uefi. 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 technician needs to boot a laptop from a USB drive to run a diagnostic tool. The USB is plugged in but the system skips it and boots from the internal SSD. Which UEFI setting is most likely preventing the USB boot?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Disable Secure Boot
Secure Boot can prevent booting from unsigned media like many diagnostic USBs.
Enable Fast Boot
Why wrong: Fast Boot speeds up boot by skipping some checks but does not block USB boot.
Set SATA mode to RAID
Why wrong: SATA mode affects storage, not boot device selection.
Disable the TPM
Why wrong: TPM is for encryption and does not control boot devices.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Disable Secure Boot
If Secure Boot is enabled and the USB is not signed or UEFI-bootable, the system may ignore it. Alternatively, the boot order may not include USB. This tests understanding of boot security and order settings.
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.
Disable Secure Boot
Why this is correct
Secure Boot can prevent booting from unsigned media like many diagnostic USBs.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Enable Fast Boot
Why it's wrong here
Fast Boot speeds up boot by skipping some checks but does not block USB boot.
Set SATA mode to RAID
Why it's wrong here
SATA mode affects storage, not boot device selection.
Disable the TPM
Why it's wrong here
TPM is for encryption and does not control boot devices.
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 220-1201 NAT questions on configuration and troubleshooting.
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FAQ
BIOS / UEFI — This question tests BIOS / UEFI — Static NAT maps one inside address to one outside address..
The correct answer is: Disable Secure Boot — If Secure Boot is enabled and the USB is not signed or UEFI-bootable, the system may ignore it. Alternatively, the boot order may not include USB. This tests understanding of boot security and order settings.
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 220-1201 NAT questions on configuration and troubleshooting.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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