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CCNA Practice Question: Which TWO statements about SFP transceivers 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 SFP transceivers and fiber optic cabling 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
✓
1000BASE-SX SFP transceivers are designed for multimode fiber and typically support distances up to 550 meters.
SFP transceivers are hot-swappable and support various media types. Multimode fiber (MMF) uses LED or VCSEL sources and is limited to shorter distances (typically up to 550m for 1000BASE-SX), while single-mode fiber (SMF) uses laser sources and can reach much longer distances (up to 10km or more for 1000BASE-LX). The correct answers are B and D. Option A is incorrect because SFP transceivers are not fixed; they can be replaced. Option C is wrong because MMF uses LED/VCSEL, not laser. Option E is wrong because SMF supports longer distances, not shorter.
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.
- ✗
SFP transceivers are permanently installed on the switch motherboard and cannot be replaced.
Why it's wrong here
SFP transceivers are hot-swappable and can be inserted or removed without powering down the switch, allowing easy media changes.
- ✓
1000BASE-SX SFP transceivers are designed for multimode fiber and typically support distances up to 550 meters.
Why this is correct
1000BASE-SX uses multimode fiber with a 850 nm wavelength and supports distances up to 550 m (depending on fiber grade).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Multimode fiber typically uses laser-based transmitters for long-distance transmission.
Why it's wrong here
Multimode fiber uses LED or VCSEL (Vertical-Cavity Surface-Emitting Laser) sources that are less expensive but limited to shorter distances.
- ✓
Single-mode fiber (SMF) with 1000BASE-LX SFP transceivers can support distances up to 10 km or more.
Why this is correct
1000BASE-LX uses a 1310 nm laser with single-mode fiber and supports distances up to 10 km (and up to 40 km with extended reach optics).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Single-mode fiber has a larger core diameter than multimode fiber, allowing longer distances.
Why it's wrong here
Single-mode fiber has a much smaller core (about 9 microns) compared to multimode (50 or 62.5 microns). The smaller core reduces modal dispersion, enabling longer distances.
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.
✓1000BASE-SX SFP transceivers are designed for multimode fiber and typically support distances up to 550 meters.Correct answer▾
Why this is correct
1000BASE-SX uses multimode fiber with a 850 nm wavelength and supports distances up to 550 m (depending on fiber grade).
✗SFP transceivers are permanently installed on the switch motherboard and cannot be replaced.Wrong answer — click to see why▾
Why this is wrong here
This statement is false because SFP slots are designed for modular, replaceable transceivers.
✗Multimode fiber typically uses laser-based transmitters for long-distance transmission.Wrong answer — click to see why▾
Why this is wrong here
Laser transmitters are used in single-mode fiber for longer distances; multimode uses LED/VCSEL.
✗Single-mode fiber has a larger core diameter than multimode fiber, allowing longer distances.Wrong answer — click to see why▾
Why this is wrong here
Single-mode fiber has a smaller core, not larger. The smaller core reduces dispersion and allows longer reach.
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: 1000BASE-SX SFP transceivers are designed for multimode fiber and typically support distances up to 550 meters. — SFP transceivers are hot-swappable and support various media types. Multimode fiber (MMF) uses LED or VCSEL sources and is limited to shorter distances (typically up to 550m for 1000BASE-SX), while single-mode fiber (SMF) uses laser sources and can reach much longer distances (up to 10km or more for 1000BASE-LX). The correct answers are B and D. Option A is incorrect because SFP transceivers are not fixed; they can be replaced. Option C is wrong because MMF uses LED/VCSEL, not laser. Option E is wrong because SMF supports longer distances, not shorter.
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
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