The answer is a worn or damaged imaging drum. This is the most likely cause because the drum is responsible for holding a uniform electrostatic charge that repels toner from non-printing areas; when it becomes scratched, worn, or loses its photoconductive properties, it cannot maintain that charge, allowing toner dust to scatter across the page and create a gray background. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of the laser printing process, specifically the charging and developing phases, and it often appears as a trap where test-takers blame the toner cartridge—but since the cartridge is genuine and recently replaced, the drum (which may be separate or integrated) is the next logical suspect. A high-voltage power supply failure could also cause this, but it is far less common and not a typical replaceable component for the exam. Memory tip: think of the drum as the “charge keeper”—if it’s worn, it can’t keep the charge, so toner sticks everywhere.
220-1201 Printers Practice Question
This 220-1201 practice question tests your understanding of printers. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 user's laser printer is producing pages with a gray background (toner dust) on the entire page. The toner cartridge is genuine and was recently replaced. The printer has printed several hundred pages since the change. 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.
Why wrong: While possible, a genuine cartridge that has printed hundreds of pages is less likely to be defective; the drum is a separate component that wears over time.
B
The primary corona wire is dirty
Why wrong: A dirty corona wire typically causes vertical streaks or poor charge, not a uniform gray background.
C
The imaging drum is worn or damaged
A worn drum cannot hold a uniform charge, causing toner to be attracted to non-image areas, resulting in a gray background.
D
The fuser temperature is too high
Why wrong: A high fuser temperature might cause smudging or paper curling, but not a gray background; that is a drum or charge issue.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The imaging drum is worn or damaged
A gray background or toner dust on laser prints is often caused by a faulty or worn imaging drum that cannot hold a proper charge, leading to toner being deposited where it shouldn't. It can also be due to a high-voltage power supply issue, but the drum is the more common replaceable component. The toner cartridge being genuine rules out compatibility issues.
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 toner cartridge is defective
Why it's wrong here
While possible, a genuine cartridge that has printed hundreds of pages is less likely to be defective; the drum is a separate component that wears over time.
✗
The primary corona wire is dirty
Why it's wrong here
A dirty corona wire typically causes vertical streaks or poor charge, not a uniform gray background.
✓
The imaging drum is worn or damaged
Why this is correct
A worn drum cannot hold a uniform charge, causing toner to be attracted to non-image areas, resulting in a gray background.
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.
✗
The fuser temperature is too high
Why it's wrong here
A high fuser temperature might cause smudging or paper curling, but not a gray background; that is a drum or charge issue.
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.
Printers — This question tests Printers — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The imaging drum is worn or damaged — A gray background or toner dust on laser prints is often caused by a faulty or worn imaging drum that cannot hold a proper charge, leading to toner being deposited where it shouldn't. It can also be due to a high-voltage power supply issue, but the drum is the more common replaceable component. The toner cartridge being genuine rules out compatibility issues.
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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