Quick Answer
The answer is twisted pair, coaxial, and fiber optic cables. These three are the common types of network cables because they represent the foundational physical media used to connect devices in a local area network, each operating on distinct principles: twisted pair uses copper wires twisted to reduce interference, coaxial uses a single copper core with shielding for longer runs, and fiber optic transmits data as light pulses through glass or plastic for high-speed, long-distance communication. On the CompTIA ITF+ FC0-U61 exam, this question tests your ability to distinguish standard cable types from less common ones like USB or serial cables, which are not used for networking. A common trap is confusing fiber optic with HDMI or thinking all copper cables are the same, so remember that fiber is the only one using light. For a quick memory tip, think of the acronym TCF: Twisted, Coaxial, Fiber—the three core cable types you’ll see on the exam.
This FC0-U61 practice question tests your understanding of infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE are common types of network cables? (Select exactly three.)
Fiber optic
Fiber optic cable uses light for high-speed data transmission.
USB
Why wrong: USB is used for peripherals, not typically for networking.
HDMI
Why wrong: HDMI carries audio/video signals, not network data.
Coaxial
Coaxial cable is used for cable internet and legacy Ethernet.
Twisted pair
Twisted pair (e.g., Cat5e, Cat6) is the most common Ethernet cable.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Fiber optic
Fiber optic cables use light pulses transmitted through glass or plastic fibers to carry data, offering high bandwidth, long-distance transmission, and immunity to electromagnetic interference. They are a standard network cable type in modern infrastructure, especially for backbone and high-speed connections.
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.
Fiber optic
Why this is correct
Fiber optic cable uses light for high-speed data transmission.
Related concept
Read the scenario before looking for a memorised answer.
USB
Why it's wrong here
USB is used for peripherals, not typically for networking.
HDMI
Why it's wrong here
HDMI carries audio/video signals, not network data.
Coaxial
Why this is correct
Coaxial cable is used for cable internet and legacy Ethernet.
Related concept
Read the scenario before looking for a memorised answer.
Twisted pair
Why this is correct
Twisted pair (e.g., Cat5e, Cat6) is the most common Ethernet cable.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse common peripheral or multimedia cables (USB, HDMI) with network cables, forgetting that network cables specifically refer to those used for local area network (LAN) or wide area network (WAN) data transmission, such as fiber optic, coaxial, and twisted pair.
Detailed technical explanation
Fiber optic cables operate using total internal reflection within the core, with single-mode fiber (SMF) supporting distances over 10 km using laser diodes at 1310 nm or 1550 nm, while multi-mode fiber (MMF) uses LEDs for shorter runs (up to 550 m) at 850 nm or 1300 nm. In real-world scenarios, fiber is preferred for data center interconnects and ISP backbones due to its low signal attenuation and high data rates (e.g., 100 Gbps and beyond).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Infrastructure — This question tests Infrastructure — Read the scenario before looking for a memorised answer..
The correct answer is: Fiber optic — Fiber optic cables use light pulses transmitted through glass or plastic fibers to carry data, offering high bandwidth, long-distance transmission, and immunity to electromagnetic interference. They are a standard network cable type in modern infrastructure, especially for backbone and high-speed connections.
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 FC0-U61 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-U61 exam.
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