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CCNA Practice Question: Which TWO statements about fiber optic cables and…
This 200-301 practice question tests your understanding of 200-301 exam topics. 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 TWO statements about fiber optic cables and SFP/SFP+ transceivers are correct?
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
✓
Single-mode fiber (SMF) uses a smaller core diameter than multimode fiber (MMF).
Single-mode fiber uses a smaller core and supports longer distances than multimode fiber. SFP+ transceivers are designed for 10 Gigabit Ethernet, while standard SFP modules support up to 1 Gbps. Multimode fiber typically has a larger core (50 or 62.5 microns) and is used for shorter distances.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Single-mode fiber (SMF) uses a smaller core diameter than multimode fiber (MMF).
Why this is correct
SMF typically has a 9-micron core, while MMF has a 50- or 62.5-micron core, allowing SMF to support longer distances.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Multimode fiber supports longer distances than single-mode fiber.
Why it's wrong here
Multimode fiber has higher modal dispersion, limiting its effective distance compared to single-mode fiber.
- ✓
SFP+ transceivers are commonly used for 10 Gigabit Ethernet connections.
Why this is correct
SFP+ is an enhanced version of SFP that supports data rates up to 10 Gbps, commonly used for 10 Gigabit Ethernet.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SFP modules support data rates up to 10 Gbps.
Why it's wrong here
Standard SFP modules support up to 1 Gbps (Gigabit Ethernet), while SFP+ modules support up to 10 Gbps.
- ✗
Multimode fiber typically has a core diameter of 9 microns.
Why it's wrong here
Multimode fiber has a larger core diameter, typically 50 or 62.5 microns; 9 microns is the core diameter for single-mode fiber.
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 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Single-mode fiber (SMF) uses a smaller core diameter than multimode fiber (MMF).Correct answer▾
Why this is correct
SMF typically has a 9-micron core, while MMF has a 50- or 62.5-micron core, allowing SMF to support longer distances.
✗Multimode fiber supports longer distances than single-mode fiber.Wrong answer — click to see why▾
Why this is wrong here
Single-mode fiber supports much longer distances (up to 10 km or more) than multimode fiber (typically up to 550 m for 10 Gbps).
✗SFP modules support data rates up to 10 Gbps.Wrong answer — click to see why▾
Why this is wrong here
SFP is limited to 1 Gbps; for 10 Gbps, SFP+ is required.
✗Multimode fiber typically has a core diameter of 9 microns.Wrong answer — click to see why▾
Why this is wrong here
This describes single-mode fiber, not multimode.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-301 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
Got this wrong? Here's your next step.
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Single-mode fiber (SMF) uses a smaller core diameter than multimode fiber (MMF). — Single-mode fiber uses a smaller core and supports longer distances than multimode fiber. SFP+ transceivers are designed for 10 Gigabit Ethernet, while standard SFP modules support up to 1 Gbps. Multimode fiber typically has a larger core (50 or 62.5 microns) and is used for shorter distances.
What should I do if I get this 200-301 question wrong?
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
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 →
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