The answer is that the CPU does not support ECC memory. Even when a motherboard supports both ECC and non-ECC DDR4 RAM, the CPU’s memory controller must be specifically designed to handle error-correcting code logic; if it lacks this support, the system will boot but silently disable the ECC functionality, running the RAM in standard non-ECC mode. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding that ECC is a CPU-dependent feature, not just a motherboard capability—a common trap is assuming the motherboard alone determines compatibility. Remember that ECC requires a server-class or workstation CPU (like Intel Xeon or AMD Ryzen Pro), not a consumer chip. A helpful memory tip: “ECC needs a CPU that can check the check—if the processor can’t correct, the RAM just connects.”
220-1201 RAM Practice Question
This 220-1201 practice question tests your understanding of ram. 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 is configuring a new server and needs to install ECC (Error-Correcting Code) RAM. The motherboard supports both ECC and non-ECC DDR4 memory. The technician installs ECC RAM, but the system boots and reports that ECC functionality is disabled. What is the most likely reason for this?
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 ECC memory.
ECC RAM requires a compatible CPU and motherboard chipset to function. If the CPU does not support ECC, the system may still boot with the RAM installed but will run it in non-ECC mode, disabling the error correction feature.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The ECC RAM is not seated properly.
Why it's wrong here
Improper seating would likely cause a no-boot or beep code, not a functional boot with ECC disabled.
✗
The BIOS needs to be updated to enable ECC support.
Why it's wrong here
While a BIOS update could add support, the most common reason is CPU incompatibility, not a missing BIOS setting.
✓
The CPU does not support ECC memory.
Why this is correct
Many consumer-grade CPUs do not support ECC, even if the motherboard does. The CPU's memory controller must be ECC-capable for the feature to work.
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.
✗
ECC RAM requires a registered (buffered) type to function.
Why it's wrong here
Registered RAM is a different type used in servers, but ECC can be unbuffered as well; the issue here is CPU support, not buffering.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
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.
RAM — This question tests RAM — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The CPU does not support ECC memory. — ECC RAM requires a compatible CPU and motherboard chipset to function. If the CPU does not support ECC, the system may still boot with the RAM installed but will run it in non-ECC mode, disabling the error correction feature.
What should I do if I get this 220-1201 question wrong?
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.
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?
Static NAT maps one inside address to one outside address.
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