220-1101 Hardware Practice Question
A technician needs to install a PCIe x4 network adapter into a desktop computer. The motherboard has the following available slots: one PCIe x16 slot (occupied by a graphics card), two PCIe x1 slots, and one PCIe x8 slot. Which slot can the technician use to install the x4 card?
⚠ Common exam trap
A common mix-up: candidates assume a PCIe card must match the slot's lane width exactly, ignoring the standard's backward compatibility and negotiation capabilities, leading them to incorrectly choose the x1 slot or consider removing the GPU.
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 PCIe x8 slot
The PCIe x8 slot is the correct choice because PCIe is designed to be backward and forward compatible in terms of lane width. A PCIe x4 card can physically and electrically operate in a PCIe x8 slot, as the slot provides at least the required number of lanes and the card will negotiate down to x4 mode. The other slots either lack the physical size (x1) or are occupied by a critical component (x16).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Any of the PCIe x1 slots
Why it's wrong here
Any of the PCIe x1 slots will not work because the physical slot opening is much shorter than the x4 card's connector, preventing the card from being inserted at all. Even if an adapter or a modified open-ended slot allowed it, a x1 slot only provides a single data lane, which is insufficient to carry the x4 card's electrical signals. The card would lack the necessary electrical connections on the remaining pins, so it could not function. This is a physical and electrical incompatibility, not merely a speed limitation.
When this WOULD be correct
If the question asked about installing a PCIe x1 card, then a PCIe x1 slot would be correct. Also, if the motherboard had an open-ended PCIe x1 slot that physically accepts longer cards, an x4 card could be installed (though it would run at x1 speed).
- ✓
The PCIe x8 slot
Why this is correct
The PCIe x8 slot is the correct choice because, despite being physically longer than the x4 card's edge connector, PCIe slots are designed to be backward-compatible down to lower lane counts. The card's x4 connector will seat fully in the x8 slot, and the slot's electrical wiring will automatically negotiate to run the card at its native x4 speed. This provides a secure, functional connection without occupying the x16 slot used by the graphics card. Notably, PCIe slots use a universal point-to-point interface, so a smaller-lane card can always work in a larger-lane slot.
- ✗
The PCIe x16 slot after removing the graphics card
Why it's wrong here
The PCIe x16 slot after removing the graphics card is technically compatible because a x4 card can run in a x16 slot at x4 speed, but it is not an 'available' slot in the intended sense. The x16 slot is already occupied by the discrete graphics card, which is essential for display output on most systems; removing it would leave the computer without a working video signal. The question asks for a slot into which the adapter can be installed without displacing or disabling existing components, so the occupied x16 slot is not a valid answer. A motherboard typically offers a dedicated x8 or x4 slot for expansion cards, and that is the proper installation target.
When this WOULD be correct
If the question stated that the PCIe x16 slot is empty and the technician needs to install a PCIe x4 card, then the x16 slot would be compatible (backward compatible) and could be used.
- ✗
A PCI slot
Why it's wrong here
A PCI slot is a legacy expansion interface that uses a completely different electrical signaling standard, parallel bus architecture, and physical connector shape compared to PCIe. A PCIe x4 network adapter cannot be inserted into a PCI slot because the connector keying and pin layout are incompatible, so the card would not even fit. Even if a mechanical adapter existed, the motherboard's chipset would have no way to route PCIe traffic over the legacy PCI bus, and the card would not be recognized. Furthermore, most modern motherboards have eliminated PCI slots entirely, making this option obsolete.
When this WOULD be correct
A technician needs to install a legacy network adapter that uses a 32-bit PCI interface into a desktop computer that has an available PCI slot. The motherboard has no PCIe slots, but has one PCI slot.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.
✓The PCIe x8 slotCorrect answer▾
Why this is correct
The PCIe x8 slot is the correct choice because, despite being physically longer than the x4 card's edge connector, PCIe slots are designed to be backward-compatible down to lower lane counts. The card's x4 connector will seat fully in the x8 slot, and the slot's electrical wiring will automatically negotiate to run the card at its native x4 speed. This provides a secure, functional connection without occupying the x16 slot used by the graphics card. Notably, PCIe slots use a universal point-to-point interface, so a smaller-lane card can always work in a larger-lane slot.
✗Any of the PCIe x1 slotsWrong answer — click to see why▾
Why this is wrong here
A PCIe x1 slot is physically smaller than an x4 card and cannot accommodate it; the card would not fit, and even if it could, the slot lacks the necessary lanes for x4 operation.
★ When this WOULD be the correct answer
If the question asked about installing a PCIe x1 card, then a PCIe x1 slot would be correct. Also, if the motherboard had an open-ended PCIe x1 slot that physically accepts longer cards, an x4 card could be installed (though it would run at x1 speed).
Why candidates choose this
Candidates may think that any PCIe slot is backward-compatible and that a smaller slot can accept a larger card, confusing physical compatibility with electrical compatibility.
✗The PCIe x16 slot after removing the graphics cardWrong answer — click to see why▾
Why this is wrong here
The PCIe x16 slot is already occupied by a graphics card, and removing it would disable the primary display output, which is not a viable solution for adding a network adapter.
★ When this WOULD be the correct answer
If the question stated that the PCIe x16 slot is empty and the technician needs to install a PCIe x4 card, then the x16 slot would be compatible (backward compatible) and could be used.
Why candidates choose this
Candidates may think that any larger slot can accommodate a smaller card, but they overlook that the x16 slot is already in use and removing the graphics card is impractical.
✗A PCI slotWrong answer — click to see why▾
Why this is wrong here
The question specifies a PCIe x4 network adapter, and PCI slots are a different, older standard (not PCIe). A PCIe x4 card cannot physically or electrically fit into a PCI slot.
★ When this WOULD be the correct answer
A technician needs to install a legacy network adapter that uses a 32-bit PCI interface into a desktop computer that has an available PCI slot. The motherboard has no PCIe slots, but has one PCI slot.
Why candidates choose this
Candidates may confuse PCI with PCIe due to similar names, or assume that any expansion slot can accept any card, overlooking the physical and electrical incompatibility between PCI and PCIe.
Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
About these practice questions
This 220-1101 question is part of Courseiva's 896-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 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 220-1101 exam.