Quick Answer
The answer is the `--device` flag, specifically used as `--device /dev/ttyUSB0` in the Docker run command. This option is correct because it grants a container direct, read-write access to a specific host device node, such as a USB drive or serial adapter, without needing the broad `--privileged` flag. By mapping the device from the host into the container’s filesystem, Docker allows the container to interact with hardware peripherals while maintaining a more secure, least-privilege posture. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding of container resource access and the distinction between device-level and full privileged access. A common trap is choosing `--privileged` instead, which opens all host devices and capabilities—overkill for a single USB device. Remember the memory tip: “Device for device” — if you need one specific device, use `--device`; if you need everything, use `--privileged`.
This XK0-005 practice question tests your understanding of scripting, containers and automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 system administrator wants to ensure that a container can access host devices such as USB drives. Which Docker run option should be used?
--device /dev/ttyUSB0
This grants the container access to the specified host device.
--privileged
Why wrong: Gives all capabilities to the container, which is broader than needed and a security risk.
--pid=host
Why wrong: Shares the PID namespace with the host, not intended for device access.
--net=host
Why wrong: Shares the host's network stack, not related to device access.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
--device /dev/ttyUSB0
The `--device` flag in Docker allows a container to directly access a specific host device, such as `/dev/ttyUSB0` for a USB drive or serial adapter. This grants the container read/write permissions to the device node without requiring full privileged access, making it the precise and secure option for this requirement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
--device /dev/ttyUSB0
Why this is correct
This grants the container access to the specified host device.
Related concept
Read the scenario before looking for a memorised answer.
--privileged
Why it's wrong here
Gives all capabilities to the container, which is broader than needed and a security risk.
--pid=host
Why it's wrong here
Shares the PID namespace with the host, not intended for device access.
--net=host
Why it's wrong here
Shares the host's network stack, not related to device access.
Common exam traps
The trap here is that candidates often choose `--privileged` because they think it is the only way to give a container hardware access, but the exam tests the understanding that `--device` provides granular, secure device access without the broad security implications of full privilege escalation.
Detailed technical explanation
Under the hood, `--device` maps a host device file into the container's cgroup and mounts it with the same major/minor device numbers, allowing the container to interact with the hardware via the kernel's device driver. A subtle behavior is that the device must exist on the host at the time of container start; if the USB drive is hot-plugged later, the container won't see it unless the device node is dynamically managed (e.g., via udev rules). In real-world scenarios, this is commonly used for granting containers access to serial consoles, GPS receivers, or USB storage without compromising the host's security.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
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FAQ
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: --device /dev/ttyUSB0 — The `--device` flag in Docker allows a container to directly access a specific host device, such as `/dev/ttyUSB0` for a USB drive or serial adapter. This grants the container read/write permissions to the device node without requiring full privileged access, making it the precise and secure option for this requirement.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This XK0-005 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 XK0-005 exam.
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