- A
Copper SFP modules require Cat6a cabling to achieve a 100-meter reach.
Why wrong: Copper SFP modules (e.g., GLC-T, SFP-GE-T) operate over standard Category 5e, 6, or 6a cabling for 100 meters. Cat6a is not a requirement; Cat5e is sufficient for 1000BASE-T.
- B
Fiber SFP modules are typically identified by the 'GLC-T' or 'SFP-GE-T' product IDs.
Why wrong: Fiber SFP modules use identifiers like GLC-SX-MM (multimode), GLC-LH-SM (single-mode). 'GLC-T' and 'SFP-GE-T' are copper (RJ-45) transceivers for 1000BASE-T.
- C
The 'show interfaces transceiver' command displays optical power levels for both Tx and Rx on fiber SFPs.
This command provides real-time transceiver diagnostics, including transmit power, receive power, temperature, voltage, and bias current. It is valid for fiber SFP modules that support digital optical monitoring (DOM).
- D
The 'show cable-diagnostics tdr interface' command can measure the distance to a break in a fiber optic cable.
Why wrong: TDR (Time Domain Reflectometry) is a diagnostic for copper cables only. Fiber optic fault location requires an Optical Time Domain Reflectometer (OTDR) or the transceiver's digital diagnostics (DOM).
- E
A multimode fiber SFP with LC connectors is commonly used for short-reach connections up to 550 meters.
1000BASE-SX SFP modules transmit over multimode fiber with LC connectors. Depending on fiber grade (OM1 to OM4), reach varies from 220 to 550 meters, with 550 m achievable on OM2 and above.
Quick Answer
The correct answer identifies that a multimode fiber SFP with LC connectors is commonly used for short-reach connections up to 550 meters, and that the 'show interfaces transceiver' command displays critical optical power levels for both transmit and receive on fiber SFPs. This is accurate because cabling SFP diagnostics rely on verifying that the optical signal stays within specified thresholds; the command outputs real-time Tx and Rx power levels, which are essential for troubleshooting link failures caused by attenuation or faulty transceivers. On the CCNA 200-301 v2 exam, this topic tests your ability to interpret transceiver operational data and distinguish between fiber types—multimode for short distances (up to 550m) versus single-mode for long hauls. A common trap is confusing LC connectors with SC or assuming all SFPs use the same diagnostic output; remember that 'show interfaces transceiver' is the go-to for optical health, not just link status. Memory tip: "MM up to 550, SM goes the distance—check Tx/Rx with 'show int trans' for persistence."
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 accurately describe cabling and SFP transceiver diagnostics?
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
The 'show interfaces transceiver' command displays optical power levels for both Tx and Rx on fiber SFPs.
Option C is correct because the 'show interfaces transceiver' command on Cisco IOS devices displays detailed operational data for SFP modules, including optical power levels for both transmit (Tx) and receive (Rx) on fiber SFPs. This output is critical for verifying that the optical signal is within the specified thresholds to ensure proper link operation.
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.
- ✗
Copper SFP modules require Cat6a cabling to achieve a 100-meter reach.
Why it's wrong here
Copper SFP modules (e.g., GLC-T, SFP-GE-T) operate over standard Category 5e, 6, or 6a cabling for 100 meters. Cat6a is not a requirement; Cat5e is sufficient for 1000BASE-T.
- ✗
Fiber SFP modules are typically identified by the 'GLC-T' or 'SFP-GE-T' product IDs.
Why it's wrong here
Fiber SFP modules use identifiers like GLC-SX-MM (multimode), GLC-LH-SM (single-mode). 'GLC-T' and 'SFP-GE-T' are copper (RJ-45) transceivers for 1000BASE-T.
- ✓
The 'show interfaces transceiver' command displays optical power levels for both Tx and Rx on fiber SFPs.
Why this is correct
This command provides real-time transceiver diagnostics, including transmit power, receive power, temperature, voltage, and bias current. It is valid for fiber SFP modules that support digital optical monitoring (DOM).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'show cable-diagnostics tdr interface' command can measure the distance to a break in a fiber optic cable.
Why it's wrong here
TDR (Time Domain Reflectometry) is a diagnostic for copper cables only. Fiber optic fault location requires an Optical Time Domain Reflectometer (OTDR) or the transceiver's digital diagnostics (DOM).
- ✓
A multimode fiber SFP with LC connectors is commonly used for short-reach connections up to 550 meters.
Why this is correct
1000BASE-SX SFP modules transmit over multimode fiber with LC connectors. Depending on fiber grade (OM1 to OM4), reach varies from 220 to 550 meters, with 550 m achievable on OM2 and above.
Related concept
Read the scenario before looking for a memorised answer.
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.
✓The 'show interfaces transceiver' command displays optical power levels for both Tx and Rx on fiber SFPs.Correct answer▾
Why this is correct
This command provides real-time transceiver diagnostics, including transmit power, receive power, temperature, voltage, and bias current. It is valid for fiber SFP modules that support digital optical monitoring (DOM).
✗Copper SFP modules require Cat6a cabling to achieve a 100-meter reach.Wrong answer — click to see why▾
Why this is wrong here
The statement incorrectly mandates Cat6a cabling, whereas Cat5e and Cat6 also support the full 100-meter distance for 1000BASE-T.
✗Fiber SFP modules are typically identified by the 'GLC-T' or 'SFP-GE-T' product IDs.Wrong answer — click to see why▾
Why this is wrong here
This mixes up part number naming conventions; GLC-T and SFP-GE-T always indicate copper transceivers, not fiber.
✗The 'show cable-diagnostics tdr interface' command can measure the distance to a break in a fiber optic cable.Wrong answer — click to see why▾
Why this is wrong here
TDR relies on electrical signals and impedance changes; it cannot function on fiber optics.
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 distinction between copper and fiber SFP product IDs (e.g., 'GLC-T' is copper, not fiber) and the correct diagnostic commands for each media type, leading candidates to confuse TDR (copper) with fiber optical power monitoring.
Detailed technical explanation
How to think about this question
The 'show interfaces transceiver' command retrieves digital optical monitoring (DOM) data from the SFP's internal diagnostics, providing real-time Tx power, Rx power, temperature, and bias current. This is essential for proactive fault detection, such as identifying a degrading fiber link before it fails, and is defined by the SFF-8472 standard for management interface of SFP modules.
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: The 'show interfaces transceiver' command displays optical power levels for both Tx and Rx on fiber SFPs. — Option C is correct because the 'show interfaces transceiver' command on Cisco IOS devices displays detailed operational data for SFP modules, including optical power levels for both transmit (Tx) and receive (Rx) on fiber SFPs. This output is critical for verifying that the optical signal is within the specified thresholds to ensure proper link operation.
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 25, 2026
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