The answer is that the CPU does not support 128 GB of RAM, which is the most likely cause when the BIOS shows less RAM than the installed CPU limit. This happens because the CPU’s integrated memory controller has a maximum capacity it can address, often limited per channel or by the processor’s architecture—for example, a mainstream CPU might cap out at 64 GB even when physically larger modules are installed. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding that the CPU, not just the motherboard, dictates memory ceilings; a common trap is to assume reseating or slot order is the issue when the real bottleneck is the processor’s spec sheet. Remember the mnemonic “CPU Caps Capacity”—always check the CPU’s maximum supported RAM before troubleshooting other hardware.
220-1101 RAM Practice Question
This 220-1201 practice question tests your understanding of ram. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is configuring a high-performance workstation with 128 GB of RAM using eight 16 GB DDR5 modules. The system boots but only shows 64 GB in the BIOS. The technician has reseated all modules and verified they are in the correct slots. What is the most likely cause?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CPU does not support 128 GB of RAM.
With high-capacity RAM configurations, the CPU's memory controller may have limitations. Some CPUs, especially mainstream models, may not support 128 GB (e.g., 64 GB max per channel). The technician should check the CPU specifications for maximum supported RAM. Another possibility is a BIOS limitation or incorrect slot population, but the CPU limit is a common oversight.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The RAM modules are not all the same speed.
Why it's wrong here
Speed mismatches would cause all modules to run at the slowest speed, not reduce total capacity.
✗
The motherboard only supports up to 64 GB of RAM.
Why it's wrong here
The motherboard manual would specify a maximum, but if it supports eight slots, it likely supports 128 GB.
✓
The CPU does not support 128 GB of RAM.
Why this is correct
Many CPUs have a memory limit (e.g., 64 GB for some models), so even with enough slots, the CPU cannot address all modules.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The RAM is not properly seated in the slots.
Why it's wrong here
The technician already reseated them, so this is less likely.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
RAM — This question tests RAM — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CPU does not support 128 GB of RAM. — With high-capacity RAM configurations, the CPU's memory controller may have limitations. Some CPUs, especially mainstream models, may not support 128 GB (e.g., 64 GB max per channel). The technician should check the CPU specifications for maximum supported RAM. Another possibility is a BIOS limitation or incorrect slot population, but the CPU limit is a common oversight.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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