Quick Answer
The answer is Cat5e, which is the most common Ethernet cable for office networks because it supports speeds up to 1 Gbps over the standard 100-meter distance while remaining backward-compatible with older 10/100 Mbps standards. This twisted-pair copper cable balances cost, performance, and ease of termination, making it the default choice for structured cabling in modern offices. On the CompTIA ITF+ FC0-U61 exam, this question tests your understanding of network media types and their real-world applications, often appearing as a straightforward recall item. A common trap is confusing Cat5e with Cat6, but remember that Cat5e is sufficient for typical office use and is far more prevalent due to lower cost. For a quick memory tip, think “5e for everyday office efficiency,” where the “e” stands for enhanced, reminding you it handles gigabit speeds without the extra expense of Cat6.
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 of the following cable types is MOST commonly used for Ethernet networks in an office?
Coaxial
Why wrong: Coaxial is for cable TV/internet, not typical office LAN.
Fiber optic
Why wrong: Fiber is for high-speed backbone, not typical desktop.
USB
Why wrong: USB is for peripherals, not networking.
Cat5e
Cat5e supports Gigabit Ethernet and is widely used.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cat5e
Cat5e (Category 5 enhanced) is the most common twisted-pair copper cable used in office Ethernet networks because it supports speeds up to 1 Gbps (1000BASE-T) over distances up to 100 meters, and it is backward-compatible with older 10/100 Mbps standards. Its widespread adoption, low cost, and ease of termination make it the default choice for structured cabling in modern office environments.
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.
Coaxial
Why it's wrong here
Coaxial is for cable TV/internet, not typical office LAN.
Fiber optic
Why it's wrong here
Fiber is for high-speed backbone, not typical desktop.
USB
Why it's wrong here
USB is for peripherals, not networking.
Cat5e
Why this is correct
Cat5e supports Gigabit Ethernet and is widely used.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse 'most common for office Ethernet' with 'highest performance,' leading them to choose fiber optic (B) instead of recognizing that Cat5e is the practical, cost-effective standard for everyday office desktop connections.
Detailed technical explanation
Cat5e cables use four twisted pairs of copper wires with a characteristic impedance of 100 ohms, and they are tested to reduce crosstalk and signal degradation up to 100 MHz. In a typical office, these cables terminate with RJ45 connectors and follow the T568A or T568B wiring standards to ensure proper pinout for 1000BASE-T, which uses all four pairs simultaneously for full-duplex gigabit communication. A real-world scenario where this matters is when a technician mistakenly uses a Cat5 (not enhanced) cable for a gigabit link, which may cause intermittent errors or fallback to 100 Mbps due to insufficient crosstalk margins.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: Cat5e — Cat5e (Category 5 enhanced) is the most common twisted-pair copper cable used in office Ethernet networks because it supports speeds up to 1 Gbps (1000BASE-T) over distances up to 100 meters, and it is backward-compatible with older 10/100 Mbps standards. Its widespread adoption, low cost, and ease of termination make it the default choice for structured cabling in modern office environments.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are common Ethernet cable categories used in local area networks?
easyWhy A: Cat5e and Cat6 are twisted-pair cables commonly used for Ethernet. Coaxial is used for cable TV, HDMI for audio/video, USB for peripherals.
Variation 2. Match each cable type to its typical use.
mediumWhy : Common cable types and their applications.
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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