- A
A standard SFP+ fiber transceiver can be used with Category 6a UTP cable to achieve 10 Gbps over 100 meters.
Why wrong: SFP+ transceivers are designed for fiber optic or direct-attach copper (DAC) cables, not twisted-pair copper. For 10GBASE-T over UTP, a different transceiver (10GBASE-T SFP+) would be needed, but it is not a standard SFP+ fiber transceiver.
- B
A 1000BASE-T SFP transceiver can operate over Category 5e UTP cable up to 100 meters.
The 1000BASE-T standard uses twisted-pair copper cabling (Category 5e or better) and supports distances up to 100 meters. SFP transceivers for 1000BASE-T are available and widely used.
- C
A 10GBASE-LR SFP+ transceiver supports distances up to 10 kilometers over single-mode fiber.
10GBASE-LR (Long Reach) is designed for single-mode fiber and supports distances up to 10 km (and sometimes up to 25 km depending on the module).
- D
An SFP transceiver for 1000BASE-SX can achieve distances up to 5 kilometers over multimode fiber.
Why wrong: 1000BASE-SX (short wavelength) uses multimode fiber and typically supports distances up to 220m (with 62.5/125µm fiber) or 550m (with 50/125µm fiber), not 5 km. Longer distances require single-mode fiber and 1000BASE-LX.
- E
SFP+ transceivers are backward compatible with SFP slots and can operate at 1 Gbps if the module supports it.
Why wrong: SFP+ slots are typically designed for 10 Gbps modules. While some SFP+ slots support SFP modules (they are electrically compatible), the statement is misleading because SFP+ transceivers themselves are not backward compatible with SFP slots; rather, SFP+ slots can accept SFP modules. The question asks about SFP+ transceivers, not slots.
SFP/SFP+ Transceivers — Supported Cable Types and Distances
This 200-301 practice question tests your understanding of network infrastructure and connectivity. 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 of the following are correct regarding Cisco SFP/SFP+ transceivers and their supported cable types?
Quick Answer
The correct answers are B and C, as a 1000BASE-T SFP transceiver operates over Cat 5e or better UTP cable up to 100 meters, and a 10GBASE-LR SFP+ transceiver supports distances up to 10 kilometers over single-mode fiber. These specifications are grounded in IEEE 802.3 standards: 1000BASE-T uses four-pair copper signaling for short-reach Ethernet, while 10GBASE-LR leverages long-wavelength optics over single-mode fiber to achieve its 10 km range. On the CCNA 200-301 v2 exam, this topic tests your understanding of SFP/SFP+ transceiver cable types and distances, often appearing in questions that pair a transceiver with its correct media and maximum reach. A common trap is confusing 1000BASE-SX (550 m over multimode fiber) with longer-range options, or assuming SFP+ modules fit into SFP slots—they do not, though SFP modules are backward-compatible in SFP+ slots. Remember the memory tip: “LR for Long Range—10 km on single-mode; SX for Short—550 m on multimode.”
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
A 1000BASE-T SFP transceiver can operate over Category 5e UTP cable up to 100 meters.
Correct answers are B and C. A 1000BASE-T SFP transceiver operates over Cat 5e or better UTP up to 100 meters as defined by IEEE 802.3ab, making B true. A 10GBASE-LR SFP+ transceiver supports up to 10 km over single-mode fiber, making C true. Option A is false because standard SFP+ fiber transceivers are not designed for UTP cabling; they require fiber or direct‑attach copper cables. (10GBASE‑T copper SFP+ modules exist but are rarely used in CCNA contexts and are not the typical SFP+ referenced.) Option D is false because 1000BASE‑SX has a maximum distance of 550 meters over multimode fiber, not 5 km. Option E is false because SFP+ transceivers have a larger form factor and do not fit into SFP slots; only SFP modules can fit into SFP+ slots (backward compatibility works the other way).
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.
- ✗
A standard SFP+ fiber transceiver can be used with Category 6a UTP cable to achieve 10 Gbps over 100 meters.
Why it's wrong here
SFP+ transceivers are designed for fiber optic or direct-attach copper (DAC) cables, not twisted-pair copper. For 10GBASE-T over UTP, a different transceiver (10GBASE-T SFP+) would be needed, but it is not a standard SFP+ fiber transceiver.
- ✓
A 1000BASE-T SFP transceiver can operate over Category 5e UTP cable up to 100 meters.
Why this is correct
The 1000BASE-T standard uses twisted-pair copper cabling (Category 5e or better) and supports distances up to 100 meters. SFP transceivers for 1000BASE-T are available and widely used.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
A 10GBASE-LR SFP+ transceiver supports distances up to 10 kilometers over single-mode fiber.
Why this is correct
10GBASE-LR (Long Reach) is designed for single-mode fiber and supports distances up to 10 km (and sometimes up to 25 km depending on the module).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An SFP transceiver for 1000BASE-SX can achieve distances up to 5 kilometers over multimode fiber.
Why it's wrong here
1000BASE-SX (short wavelength) uses multimode fiber and typically supports distances up to 220m (with 62.5/125µm fiber) or 550m (with 50/125µm fiber), not 5 km. Longer distances require single-mode fiber and 1000BASE-LX.
- ✗
SFP+ transceivers are backward compatible with SFP slots and can operate at 1 Gbps if the module supports it.
Why it's wrong here
SFP+ slots are typically designed for 10 Gbps modules. While some SFP+ slots support SFP modules (they are electrically compatible), the statement is misleading because SFP+ transceivers themselves are not backward compatible with SFP slots; rather, SFP+ slots can accept SFP modules. The question asks about SFP+ transceivers, not slots.
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.
✓A 1000BASE-T SFP transceiver can operate over Category 5e UTP cable up to 100 meters.Correct answer▾
Why this is correct
The 1000BASE-T standard uses twisted-pair copper cabling (Category 5e or better) and supports distances up to 100 meters. SFP transceivers for 1000BASE-T are available and widely used.
✗A standard SFP+ fiber transceiver can be used with Category 6a UTP cable to achieve 10 Gbps over 100 meters.Wrong answer — click to see why▾
Why this is wrong here
Standard SFP+ fiber transceivers are not designed for copper UTP cabling; they require fiber or direct-attach copper cables.
Why candidates choose this
Students may confuse SFP+ with 10GBASE-T or think that all 10 Gbps transceivers can use Cat6a UTP, but SFP+ modules typically use fiber or DAC, not copper twisted-pair.
✗An SFP transceiver for 1000BASE-SX can achieve distances up to 5 kilometers over multimode fiber.Wrong answer — click to see why▾
Why this is wrong here
1000BASE-SX (short wavelength) uses multimode fiber and typically supports distances up to 220m (with 62.5/125µm fiber) or 550m (with 50/125µm fiber), not 5 km. Longer distances require single-mode fiber and 1000BASE-LX.
Why candidates choose this
Students may overestimate the distance capability of multimode fiber or confuse 1000BASE-SX with 1000BASE-LX, which supports longer distances over single-mode fiber.
✗SFP+ transceivers are backward compatible with SFP slots and can operate at 1 Gbps if the module supports it.Wrong answer — click to see why▾
Why this is wrong here
SFP+ transceivers themselves are not backward compatible with SFP slots; rather, SFP+ slots can accept SFP modules. The statement is misleading because it suggests SFP+ transceivers can be used in SFP slots, which is generally not true as SFP slots are designed for 1 Gbps modules.
Why candidates choose this
Students may confuse the compatibility of SFP+ slots (which often accept SFP modules) with the compatibility of SFP+ transceivers in SFP slots. The key distinction is that SFP+ slots are backward compatible with SFP modules, not the other way around.
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
Cisco often tests the misconception that SFP/SFP+ transceivers are exclusively fiber-optic, causing candidates to forget that 1000BASE-T copper SFPs exist and operate over standard UTP cabling, or they confuse the distance limits of 1000BASE-SX (multimode) with those of 1000BASE-LX (single-mode).
Detailed technical explanation
How to think about this question
SFP and SFP+ transceivers are hot-pluggable modules that convert electrical signals to optical or copper signals. The 1000BASE-T SFP module internally contains a PHY chip that performs auto-negotiation and supports speeds of 10/100/1000 Mbps over twisted-pair cabling. In real-world deployments, using Category 5e or Category 6 cabling is critical to maintain signal integrity at 100 meters; exceeding this distance can cause excessive attenuation and bit errors due to crosstalk and signal loss.
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.
TExam Day Tips
- 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
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A 1000BASE-T SFP transceiver can operate over Category 5e UTP cable up to 100 meters. — Correct answers are B and C. A 1000BASE-T SFP transceiver operates over Cat 5e or better UTP up to 100 meters as defined by IEEE 802.3ab, making B true. A 10GBASE-LR SFP+ transceiver supports up to 10 km over single-mode fiber, making C true. Option A is false because standard SFP+ fiber transceivers are not designed for UTP cabling; they require fiber or direct‑attach copper cables. (10GBASE‑T copper SFP+ modules exist but are rarely used in CCNA contexts and are not the typical SFP+ referenced.) Option D is false because 1000BASE‑SX has a maximum distance of 550 meters over multimode fiber, not 5 km. Option E is false because SFP+ transceivers have a larger form factor and do not fit into SFP slots; only SFP modules can fit into SFP+ slots (backward compatibility works the other way).
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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