Free Access CompTIA FC0-U71 New Release

The correct answer is A. Fiber. The typing error “SPF” should be corrected to “SFP,” which stands for small form-factor pluggable. SFP is used with fiber-optic network connections. Ethernet/RJ45 is associated with twisted-pair copper cables. Lightning is an Apple connector, and Thunderbolt is a high-speed peripheral/display interface, not the best match for an SFP router connection.

Exact Extract/Reference: The CompTIA Tech+ Study Guide identifies the “small form-factor pluggable (SFP) connector” as the fiber connector and states, “remember there is RJ45 for twisted-pair copper cables and SFP for fiber-optic cables.”

According to the CompTIA Tech+ Study Guide (Exam FC0-U71, 3rd Edition, 2025):

“A crimper is used to attach modular connectors, such as RJ45 or RJ11, to network or phone cables. The crimper pushes the metal contacts into the wires, securing them in place.”

Punchdown tools, by contrast, are used for patch panels or keystone jacks, not RJ45 ends.

Verified Reference:

Chapter 2: Peripherals and Connectors — “Networking Tools: Crimpers, Punchdown Tools, Cable Testers” (pp. 106–108).

Interference or poor signal strength is a common issue in Wi-Fi networks, especially in distant or obstructed locations like basements.

“Physical obstructions and electronic interference can weaken wireless signals, leading to connectivity issues in areas like basements.” — CompTIA ITF+ Networking Fundamentals

Correct answer: A

Although a phone number contains only digits, it is best stored as a string because:

It doesn’t require mathematical operations.

It may include formatting symbols like dashes or parentheses.

“Phone numbers are stored as strings because they are identifiers, not values for computation.” — CompTIA ITF+ Data Types

Correct answer: A