- A
The virtual SCSI controller is not compatible with the guest OS.
Why wrong: SCSI controller compatibility affects disk access, not booting from DVD; the ISO is on a virtual DVD drive, not the SCSI controller.
- B
The ISO file is corrupted or incomplete.
Why wrong: A corrupted ISO would likely cause a different error, such as 'Boot failure' or a CRC error, not 'Operating system not found'.
- C
The virtual DVD drive is not connected to the VM’s IDE controller.
Many hypervisors require the virtual DVD drive to be attached to an IDE controller for booting. If it is on a SCSI controller or not attached at all, the VM cannot boot from it.
- D
The VM’s BIOS is set to UEFI instead of legacy BIOS.
Why wrong: UEFI vs legacy BIOS affects boot mode but does not cause 'Operating system not found' if the DVD is properly attached; the error would be different.
220-1101 Virtualization Concepts Practice Question
This 220-1201 practice question tests your understanding of virtualization concepts. 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 technician is troubleshooting a VM that fails to boot with the error 'Operating system not found.' The VM was created from a template that uses a virtual SCSI controller. The technician verifies that the ISO file is attached to the virtual DVD drive and the boot order is set to DVD first. What is the most likely cause of the error?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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 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
The virtual DVD drive is not connected to the VM’s IDE controller.
This error often occurs when the VM cannot find a bootable device. Even with the ISO attached, if the virtual DVD drive is not connected to the correct controller or is not enabled, the VM will not boot from it. The correct answer points to a common oversight: the virtual DVD drive may be on a different controller or not attached.
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 virtual SCSI controller is not compatible with the guest OS.
Why it's wrong here
SCSI controller compatibility affects disk access, not booting from DVD; the ISO is on a virtual DVD drive, not the SCSI controller.
- ✗
The ISO file is corrupted or incomplete.
Why it's wrong here
A corrupted ISO would likely cause a different error, such as 'Boot failure' or a CRC error, not 'Operating system not found'.
- ✓
The virtual DVD drive is not connected to the VM’s IDE controller.
Why this is correct
Many hypervisors require the virtual DVD drive to be attached to an IDE controller for booting. If it is on a SCSI controller or not attached at all, the VM cannot boot from it.
Clue confirmation
The clue words "first", "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The VM’s BIOS is set to UEFI instead of legacy BIOS.
Why it's wrong here
UEFI vs legacy BIOS affects boot mode but does not cause 'Operating system not found' if the DVD is properly attached; the error would be different.
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.
What to study next
Got this wrong? Here's your next step.
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.
- →
Virtualization Concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Virtualization Concepts practice questions
Targeted practice on this topic area only
- →
All 220-1201 questions
1,020 questions across all exam domains
- →
CompTIA A+ Core 1 220-1201 study guide
Full concept coverage aligned to exam objectives
- →
220-1201 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 220-1201 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Mobile Device Hardware Servicing practice questions
Practise 220-1201 questions linked to Mobile Device Hardware Servicing.
Mobile Device Connection Methods practice questions
Practise 220-1201 questions linked to Mobile Device Connection Methods.
Mobile Device Accessories practice questions
Practise 220-1201 questions linked to Mobile Device Accessories.
Mobile Device Network Connectivity practice questions
Practise 220-1201 questions linked to Mobile Device Network Connectivity.
Mobile Device Application Support practice questions
Practise 220-1201 questions linked to Mobile Device Application Support.
Network Protocols practice questions
Practise 220-1201 questions linked to Network Protocols.
TCP & UDP Ports practice questions
Practise 220-1201 questions linked to TCP & UDP Ports.
Wireless Networking Technologies practice questions
Practise 220-1201 questions linked to Wireless Networking Technologies.
Network Services practice questions
Practise 220-1201 questions linked to Network Services.
Network Configuration Concepts practice questions
Practise 220-1201 questions linked to Network Configuration Concepts.
Common Networking Hardware practice questions
Practise 220-1201 questions linked to Common Networking Hardware.
IP Addressing practice questions
Practise 220-1201 questions linked to IP Addressing.
Practice this exam
Start a free 220-1201 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 220-1201 question test?
Virtualization Concepts — This question tests Virtualization Concepts — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The virtual DVD drive is not connected to the VM’s IDE controller. — This error often occurs when the VM cannot find a bootable device. Even with the ISO attached, if the virtual DVD drive is not connected to the correct controller or is not enabled, the VM will not boot from it. The correct answer points to a common oversight: the virtual DVD drive may be on a different controller or not attached.
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: "first", "most likely". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More 220-1201 practice questions
- A customer reports that their laptop's touchpad is unresponsive after they spilled a small amount of liquid on the keybo…
- A technician is replacing a cracked screen on a smartphone. After removing the old screen, they notice a small, flat, re…
- A user complains that their tablet's battery drains very quickly, even when not in use. The device is one year old and w…
- A technician is installing a new SSD into a customer's laptop. After removing the bottom cover, they see the existing ha…
- A technician is troubleshooting a laptop that will not charge. The battery is removable, and the power adapter works on…
- A customer brings in a smartphone with a broken charging port. They want the port replaced. During disassembly, the tech…
Last reviewed: Jun 18, 2026
This 220-1201 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 220-1201 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.