Prepare for CompTIA A+ Core 1 (220-1201) with free sample questions, a full-length diagnostic, topic drills, timed practice, hardware, mobile devices, networking, virtualization, cloud basics, troubleshooting scenarios, and detailed explanations in IT Mastery.
CompTIA A+ Core 1 (220-1201) covers the practical support decisions around hardware, mobile devices, networking, printers, virtualization, cloud basics, and troubleshooting. If you are searching for 220-1201 sample questions, a practice test, mock exam, or simulator, this is the main IT Mastery page to start on web and continue on iOS or Android with the same IT Mastery account.
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Free diagnostic: Try the 90-question CompTIA A+ Core 1 full-length practice exam before subscribing. Use it to separate misses around hardware, mobile devices, networking, virtualization/cloud, and troubleshooting sequence.
220-1201 questions usually reward the answer that follows the safest troubleshooting step, picks the most appropriate component or connector, and avoids unnecessary disruption to the user environment.
Core 1 questions usually reward safe, least-disruptive support decisions. Use these filters before choosing a fix.
| Symptom signal | First check | Strong answer usually… | Weak answer usually… |
|---|---|---|---|
| Storage is clicking, slow, or unstable | Data protection | Backs up critical data first and limits additional writes | Runs aggressive repair tools before backup |
| A printer has streaks or jams | Printer type and maintenance path | Uses the correct built-in utility, consumable, cleaning, or paper-path step | Applies a generic fix that can damage the printer |
| A wireless or SOHO issue appears | Layer and scope | Checks signal, IP settings, DNS, gateway, and physical placement in order | Replaces hardware before isolating the failure |
| A mobile accessory will not pair | Radio state and pairing mode | Enables Bluetooth/NFC as appropriate and confirms discoverability, PIN, and compatibility | Disables the feature needed for discovery |
| A component upgrade is requested | Form factor and compatibility | Checks slot, connector, power, cooling, firmware, and OS support | Picks the fastest part without compatibility checks |
| A VM/cloud client issue appears | Resource and connectivity path | Checks host resources, network mode, credentials, and service status | Treats every cloud symptom as an internet outage |
| Domain area | What the exam tests | What IT Mastery practice should force | Common trap |
|---|---|---|---|
| Hardware and devices | Whether you can identify components, connectors, storage, displays, printers, and peripherals | Choose the correct part or maintenance step from the symptom | Memorizing parts without knowing failure signs |
| Mobile devices | Whether ports, accessories, connectivity, and device support steps are clear | Match symptoms to pairing, display, power, or network causes | Treating mobile support like desktop support |
| Networking | Whether basic IP, ports, protocols, Wi-Fi, and SOHO concepts are usable | Identify layer, service, and tool before replacing equipment | Chasing symptoms without isolating the layer |
| Virtualization and cloud | Whether client-side cloud and VM concepts are understood | Connect resource, network, and service dependencies | Assuming the cloud removes local troubleshooting |
| Troubleshooting | Whether you follow safe sequence and least-disruptive remediation | Protect data, verify symptoms, test theories, and document outcomes | Jumping to replacement or reset too early |
| Timing | Practice focus | What to review after the set |
|---|---|---|
| Days 7-5 | One 90-question diagnostic plus drills in weak Core 1 domains | Whether misses came from components, mobile, networking, cloud/VM concepts, printers, or troubleshooting order |
| Days 4-3 | Mixed support scenarios | Whether you can name the safest first step and the reason weaker actions are disruptive |
| Days 2-1 | Light review of ports, connectors, wireless symptoms, printer maintenance, storage failure signs, and backup-first rules | Only recurring traps; avoid broad new hardware lists late |
| Exam day | Short warm-up if useful | Choose the least-disruptive action that protects data and isolates the symptom |
If you can score above 75% on several unseen mixed attempts and explain the troubleshooting sequence behind misses, you are likely ready. Do not keep repeating familiar items until memorized symptoms replace diagnostic reasoning.
Use these child pages when you want focused IT Mastery practice before returning to mixed sets and timed mocks.
Need concept review first? Read the CompTIA A+ 220-1201 Cheat Sheet on Tech Exam Lexicon, then return here for timed mocks, topic drills, and full IT Mastery practice.
Topic: Domain 1: Mobile Devices
Which of the following statements about pairing a Bluetooth accessory with a mobile device is NOT correct?
Options:
Best answer: C
Explanation: The statement about disabling Bluetooth on the mobile device until the accessory appears in the list is incorrect. Discovery and pairing can happen only when Bluetooth is enabled on the mobile device. You must have Bluetooth turned on during scanning; turning it off prevents any devices from being found.
Topic: Domain 3: Hardware
A home user reports that their color inkjet printer is producing horizontal streaks on color prints and occasionally experiences paper jams. You verify that the user is using appropriate inkjet paper. You are about to perform maintenance on the printer.
Which of the following actions should you AVOID while servicing this inkjet printer? (Select TWO.)
Options:
Correct answers: B and E
Explanation: The option that sprays compressed air directly into the paper feed rollers while the printer is powered on is unsafe and improper. Compressed air can push debris deeper into the printer, damage rollers or sensors, and working with the printer powered on increases the risk of mechanical or electrical harm.
The option that scrubs the printhead nozzles with a dry paper towel and isopropyl alcohol is also something to avoid. Inkjet printheads are delicate; paper towels are abrasive and can leave fibers, and alcohol may not be approved by the manufacturer. This can cause permanent damage to the nozzles and result in worse print quality or a failed printhead.
Both of these actions clearly violate good maintenance practice and manufacturer guidelines, so they are the choices that should be avoided.
Topic: Domain 5: Hardware and Network Troubleshooting
A user reports that their laptop has become very slow and the internal HDD has started making occasional clicking noises, but the system still boots and files are accessible. The user has no current backups and the data is critical. Which of the following should the technician do FIRST to best protect the user’s data?
Options:
Best answer: A
Explanation: The choice to immediately copy the user’s important files to an external backup drive and limit further use of the failing HDD is best because it directly addresses the primary risk: loss of critical, unbacked-up data. It minimizes additional reads/writes on the failing disk and creates a backup while the drive is still accessible. This follows best practice: back up first, then repair or replace.
Topic: Domain 5: Hardware and Network Troubleshooting
In a typical IPv4 configuration on a home PC, which setting identifies the device that forwards traffic from the local network to remote networks such as the internet?
Options:
Best answer: C
Explanation: The choice describing the default gateway is correct because the default gateway is specifically the router address that a host uses to forward traffic destined for remote networks. Without a working default gateway, devices can usually talk to local systems but not to the wider internet.
Topic: Domain 3: Hardware
A cashier reports that a new receipt printer advances paper correctly, but the receipts come out completely blank. You verify that the printer is set up as a thermal model and that it feeds without jamming. You check the paper packaging the user installed.
Exhibit:
| Label field | Value |
|---|---|
| Product | 80mm POS paper rolls |
| Paper type | Plain bond (non-thermal) |
| Printer examples | Inkjet, impact receipt |
| Note | Not for thermal printers |
Based on the exhibit, which action should you take NEXT?
Options:
Best answer: C
Explanation: Replacing the current roll with compatible thermal receipt paper addresses the root cause visible in the exhibit: the installed media is labeled as plain bond, non-thermal paper and explicitly “Not for thermal printers.” A thermal printer must use thermal paper; once the correct paper is installed, the printhead’s heat will produce visible text and graphics on the receipts.
Topic: Domain 3: Hardware
Which statement BEST describes compatibility between DDR3, DDR4, and DDR5 desktop RAM and motherboards?
Options:
Best answer: C
Explanation: The choice stating that each motherboard is designed for a specific DDR generation and that different generations are not physically compatible is correct because it captures the key fact: DDR3, DDR4, and DDR5 have different keying and electrical standards, so they cannot be interchanged across slots. This is the essential compatibility rule for DDR generations at the A+ level.
Topic: Domain 1: Mobile Devices
A user connects a new external USB-C webcam with a built-in microphone to a laptop. The OS detects a “USB camera” but the video chat app still uses the laptop’s internal camera and microphone. The user also mentions the webcam sometimes disconnects when plugged into a thin, bus-powered hub.
Which of the following troubleshooting actions should you AVOID? (Select TWO.)
Options:
Correct answers: B and E
Explanation: The choice that forces a USB-C connector into an HDMI port is incorrect because USB-C and HDMI are different physical interfaces. They are not interchangeable, and forcing a connector can bend pins, crack ports, or damage the laptop’s motherboard.
The choice that installs a driver package from an unofficial third-party website is also incorrect. Drivers should come from the operating system’s update service or the hardware manufacturer’s official site. Third-party driver packs can be outdated, incompatible, or malicious, violating basic security and support best practices.
Topic: Domain 3: Hardware
A user just purchased a fast external NVMe SSD enclosure that supports USB 3.x over USB-C but did not include a cable. Their ultrabook has only USB-C ports and they want the fastest possible transfer speeds with a reversible plug and no adapters or docks. Which type of cable should the technician recommend to BEST meet these requirements?
Options:
Best answer: C
Explanation: The USB 3.x USB-C to USB-C data cable matches all requirements:
Topic: Domain 5: Hardware and Network Troubleshooting
Which of the following statements about troubleshooting paper-feed problems in printers is NOT correct?
Options:
Best answer: B
Explanation: The statement about adding more toner to clear repeated paper jams in the fuser area is incorrect. Toner is related to image formation, not paper transport. Jams near the fuser are far more likely to be caused by worn fuser components, incorrect paper type, or damaged sheets. Adding toner will not fix a mechanical jam and may waste supplies or delay proper troubleshooting.
Topic: Domain 4: Virtualization and Cloud Computing
Which of the following statements about using containers versus full virtual machines (VMs) is NOT correct?
Options:
Best answer: C
Explanation: The statement claiming that each container runs a full, separate guest OS with its own kernel and is heavier than VMs is not correct. In reality, containers share the host OS kernel and are generally lighter-weight than full VMs. They are not typically used as the primary way to run full desktop environments; that role is more common for full virtual machines, which provide a complete guest OS and virtual hardware.
Topic: Domain 4: Virtualization and Cloud Computing
A help-desk technician needs to open a suspicious email attachment to see what it does, but must prevent any possible infection from spreading to the host operating system or the company network and be able to return the test environment to a clean state quickly. Which approach BEST uses virtualization as a sandbox for this task?
Options:
Best answer: A
Explanation: The choice to open the attachment inside a virtual machine, then revert the VM to a known-good snapshot after testing is correct because it directly uses virtualization for sandboxing:
This is exactly how VMs are intended to be used for safe software and configuration testing.
Topic: Domain 3: Hardware
Which statement BEST describes ECC RAM compared to non‑ECC RAM?
Options:
Best answer: C
Explanation: The choice stating that ECC RAM can detect and usually correct single‑bit memory errors and is commonly used in servers and high‑reliability workstations is correct because it captures both the technical function (error detection/correction) and the typical environment (servers and reliable workstations). This directly matches how ECC is contrasted with non‑ECC RAM in A+ objectives.
Topic: Domain 5: Hardware and Network Troubleshooting
A user reports very slow file transfers between their wired desktop and the local file server, but other desktops on the same switch do not have this issue. You check the managed switch and view the status for the user’s port, shown below.
Exhibit:
Port ID: 7 (User-Desk)
Link Status: Up
Speed: 100 Mb/s
Duplex: Half
Errors: 0
Collisions: 1,536
Based on this exhibit, which issue is the most likely cause of the user’s slow network speeds?
Options:
Best answer: A
Explanation: The option describing a duplex mismatch between the desktop NIC and the switch port best matches the exhibit. The key clues are the Half duplex setting combined with 1,536 collisions. On a modern switched network, full duplex is standard, and a high collision count on a single port indicates the two ends of the link are not using the same duplex mode, leading to slow, unreliable performance for that host.
Topic: Domain 2: Networking
In a typical small office network that uses a DHCP server, which device is MOST appropriate to configure with a static IP address rather than obtaining one automatically via DHCP?
Options:
Best answer: A
Explanation: The shared network printer is a common resource that many users access, often via a saved IP address or a print server configuration. If its IP were to change under DHCP, all those references could break. Assigning the printer a static IP ensures it remains reachable at the same address and keeps printing reliable.
Topic: Domain 2: Networking
Which of the following statements about the 2.4 GHz, 5 GHz, and 6 GHz Wi‑Fi bands is NOT correct?
Options:
Best answer: C
Explanation: The statement claiming that the 6 GHz band’s signals “travel farther and pass through walls more easily than 2.4 GHz” is incorrect. In reality, as frequency increases, radio waves suffer more attenuation and have a harder time penetrating solid objects.
Therefore, 6 GHz has shorter range and worse wall penetration than 2.4 GHz. While 6 GHz is great for very high throughput in relatively open, short-range environments, it is not the best choice for long-range whole-home coverage on its own.
Topic: Domain 5: Hardware and Network Troubleshooting
A user reports that after leaving a spreadsheet open all day on an LCD monitor, a faint outline of the grid remains visible when they switch to other applications. The technician notices that the ghost image gradually fades after a few minutes of displaying different content. Which type of display artifact is this?
Options:
Best answer: B
Explanation: Image persistence is the only option that matches both key details: a ghost image of previously displayed content and the fact that it gradually fades after showing different content. This temporary nature is the deciding attribute that distinguishes image persistence from permanent burn-in and from individual pixel defects.
Topic: Domain 3: Hardware
A technician is setting up a cable internet connection for a home user. Which connector type is used to attach the cable modem to the coaxial wall outlet provided by the cable TV company?
Options:
Best answer: A
Explanation: The choice stating “F-type” is correct because F-type connectors are specifically designed for coaxial cable and are standard on cable TV wall plates and cable modems, making them the appropriate connector for this scenario.
Topic: Domain 5: Hardware and Network Troubleshooting
A user reports that their desktop has recently begun making loud clicking and grinding sounds, and it occasionally freezes during file access. You open a diagnostics tool and see the following:
Storage Diagnostic – Disk 0
---------------------------------
Model: ST1000DM010-2EP102
Type: HDD (SATA)
SMART Status: FAILED
Warning: Imminent disk failure detected.
User report: Repetitive clicking / grinding noise
---------------------------------
Recommendation: Back up data immediately.
Based on the information in the exhibit, what should you do NEXT?
Options:
Best answer: B
Explanation: The choice to immediately back up the user’s data and arrange to replace the hard drive directly addresses the situation shown in the exhibit. The diagnostics tool explicitly states SMART Status: FAILED and Warning: Imminent disk failure detected, and the user reports clicking / grinding noise. Together, these are classic signs of an about-to-fail mechanical HDD.
Backing up first protects the user’s data before the drive becomes completely unreadable. Replacing the drive resolves the underlying hardware problem instead of trying to repair a failing mechanical component that is unlikely to recover.
Topic: Domain 5: Hardware and Network Troubleshooting
A user leaves a dashboard application open on an LCD monitor all day. The screen now shows a faint ghost of the grid even after the app is closed, and there is a single bright green dot that never changes color. Which of the following actions will best address this issue? (Select TWO.)
Options:
Correct answers: A and C
Explanation: Enabling a moving screen saver or short display sleep timeout directly addresses image persistence by preventing long‑term static content and giving pixels time to recover. Replacing the monitor under warranty is the appropriate solution for a stuck bright pixel, which is a physical panel defect that software or cleaning cannot fix reliably.
Topic: Domain 2: Networking
A freelance video editor currently uses a basic DSL line (15Mbps down/1Mbps up) from home. They regularly upload multi‑gigabyte video files to clients and host high‑definition video calls, and they want lower latency and much faster uploads without worrying about strict data caps. Several other internet options are now available in their area. Which upgrade would BEST meet these needs?
Options:
Best answer: C
Explanation: Upgrading to a residential fiber‑optic internet connection with symmetric high‑speed service directly addresses all requirements:
This option improves performance in all key areas without introducing new constraints or unnecessary complexity, making it the best optimization over basic DSL.
Topic: Domain 1: Mobile Devices
Which TWO statements about replacing laptop hard disk drives (HDDs) with solid-state drives (SSDs) are correct? (Select TWO.)
Options:
Correct answers: D and E
Explanation: The statement about 2.5-inch SATA SSDs fitting into existing 2.5-inch SATA HDD bays using the same SATA connectors is correct because both use the same interface, making them common drop-in upgrades. The statement about SSDs improving battery life is also correct, as SSDs typically draw less power and have no moving parts, which reduces energy consumption and contributes to longer battery runtime.
Topic: Domain 1: Mobile Devices
A sales rep is in a client’s office and needs to give a single laptop internet access using the rep’s smartphone. The phone’s battery is already at 30%, and the rep is most concerned with preserving battery life for the rest of the day. Which method should the technician recommend?
Options:
Best answer: B
Explanation: Connecting the phone to the laptop with a USB cable and enabling USB tethering is best because it addresses the single deciding factor: battery preservation. USB tethering lets the phone share its cellular connection while typically receiving power from the laptop’s USB port, minimizing net battery drain compared with purely wireless tethering methods.
Topic: Domain 3: Hardware
A user reports that their Windows 11 desktop will not play a Blu‑ray movie disc. When they insert the disc, nothing mounts in the OS, but audio CDs and DVD movies work fine in the same drive. Multiple Blu‑ray discs show the same behavior. Which of the following is the MOST likely cause?
Options:
Best answer: C
Explanation: The choice stating that the installed optical drive only supports CDs and DVDs explains why CDs and DVDs work while every Blu‑ray disc fails to mount. A CD/DVD‑only drive physically cannot read Blu‑ray media, which is exactly the symptom described. This matches both the behavior and the known differences among CD, DVD, and Blu‑ray formats.
Topic: Domain 2: Networking
A technician is configuring public DNS for a new web server with the IPv4 address 198.51.100.42. The server must be reachable at www.example.com using that IPv4 address. Which type of DNS record should the technician create for www.example.com?
Options:
Best answer: D
Explanation: The choice of an A record matches the requirement to map a hostname (www.example.com) directly to an IPv4 address (198.51.100.42). A records are the standard way to publish IPv4 host addresses in DNS, which is exactly the configuration described.
Use this map after the sample questions to connect individual items to the A+ Core 1 hardware, networking, mobile, virtualization, and troubleshooting decisions these practice samples test.
flowchart LR
S1["User or device symptom"] --> S2
S2["Identify hardware network mobile or virtualization area"] --> S3
S3["Gather evidence safely"] --> S4
S4["Apply least-invasive troubleshooting step"] --> S5
S5["Verify fix and document outcome"] --> S6
S6["Escalate if scope exceeds technician role"]
| Cue | What to remember |
|---|---|
| Troubleshooting order | Identify, theorize, test, plan, implement, verify, and document rather than jumping to replacement. |
| Hardware | Know ports, cables, storage, memory, printers, mobile devices, and PC component symptoms. |
| Networking | Recognize SOHO equipment, IP settings, wireless symptoms, and basic connectivity tests. |
| Virtualization | Separate host, guest, resource, and network issues. |
| Safety | Use ESD protection, power safety, and correct handling before touching hardware. |