FC0-U71 Infrastructure Practice Question
A technician is setting up a new laptop for a traveling salesperson. The laptop must have a built-in cellular modem so the user can access the internet without relying on Wi-Fi hotspots or tethering to a phone. Which internal expansion slot is specifically designed to accept a cellular modem module in a modern laptop?
⚠ Common exam trap
The trap here is assuming any M.2 slot can host any M.2 device, when keying and supported protocols determine whether a slot accepts a WWAN modem, an SSD, or neither.
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
✓
M.2 slot
A cellular modem module in a laptop connects through an M.2 slot keyed for WWAN, typically using PCIe or USB lanes. This slot is designed for the small 3042/3052 module form factor and works with the pre-installed antenna cables found in business laptops. Other listed slots serve memory, storage, or desktop expansion roles and cannot accept or electrically support a WWAN module.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
M.2 slot
Why this is correct
M.2 slots with key B or key B+M accept cellular modem modules, often in the 3042 or 3052 form factor. These slots connect via PCIe or USB signals to the chipset, allowing the modem to be recognized as a WWAN device. Many business laptops include a dedicated M.2 WWAN slot with antenna cables pre-routed, making it the standard internal interface for adding cellular connectivity without external dongles.
- ✗
SO-DIMM slot
Why it's wrong here
SO-DIMM slots accept small outline dual in-line memory modules for RAM, not cellular modems. While laptops commonly have SO-DIMM slots, they are wired to the memory controller and only recognize JEDEC-compliant memory devices. Inserting a WWAN module into a SO-DIMM slot is physically and electrically incompatible, so this slot cannot provide the built-in cellular connectivity the salesperson needs.
- ✗
SATA data connector
Why it's wrong here
SATA data connectors are used to attach 2.5-inch drives or optical drives inside a chassis. They carry storage protocols, not the PCIe or USB signals a cellular modem requires. Although some laptops include SATA ports for drives, they do not support WWAN modules, and the connector shape is entirely different. This interface therefore cannot be used to add a built-in cellular modem to the laptop.
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PCIe x16 slot
Why it's wrong here
PCIe x16 slots are found on desktop motherboards for graphics cards and are far too large for a laptop chassis. Laptops do not expose full-length PCIe slots internally because of space and power constraints. Even if a laptop used PCIe signaling, the physical slot cannot accept a small cellular modem module, so this choice cannot satisfy the requirement for built-in cellular access in a portable system.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This FC0-U71 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 FC0-U71 exam.