- A
SFP modules are hot-swappable, meaning they can be inserted or removed without powering off the switch.
Small Form-factor Pluggable transceivers are designed for hot insertion/removal to minimize network downtime.
- B
Copper 1000BASE-T SFP modules can transmit data up to 10 km over Category 5e cabling.
Why wrong: Copper SFPs are limited to 100 meters; the 10 km distance requires single-mode fiber optics.
- C
The show interfaces transceiver command provides diagnostic details such as temperature, voltage, and optical power levels.
This command reads DOM (Digital Optical Monitoring) data, showing real-time transceiver parameters for troubleshooting.
- D
Multi-mode fiber uses a smaller core diameter, about 9 microns, compared to single-mode fiber.
Why wrong: Single-mode fiber has the smaller core (9 μm); multi-mode fiber cores are 50 or 62.5 μm.
- E
Any SFP transceiver, regardless of vendor, will operate in a Cisco switch by default.
Why wrong: Cisco switches may reject non-Cisco coded optics unless explicitly allowed via the 'service unsupported-transceiver' command, and even then some platforms require Cisco-branded SFPs.
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 interface diagnostics are true?
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
SFP modules are hot-swappable, meaning they can be inserted or removed without powering off the switch.
Option A is correct because SFP (Small Form-factor Pluggable) modules are designed to be hot-swappable, allowing insertion or removal without powering down the switch. This capability is essential for maintaining network uptime during maintenance or upgrades, as the switch can dynamically detect and configure the module without a reboot.
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 modules are hot-swappable, meaning they can be inserted or removed without powering off the switch.
Why this is correct
Small Form-factor Pluggable transceivers are designed for hot insertion/removal to minimize network downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Copper 1000BASE-T SFP modules can transmit data up to 10 km over Category 5e cabling.
Why it's wrong here
Copper SFPs are limited to 100 meters; the 10 km distance requires single-mode fiber optics.
- ✓
The show interfaces transceiver command provides diagnostic details such as temperature, voltage, and optical power levels.
Why this is correct
This command reads DOM (Digital Optical Monitoring) data, showing real-time transceiver parameters for troubleshooting.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Multi-mode fiber uses a smaller core diameter, about 9 microns, compared to single-mode fiber.
Why it's wrong here
Single-mode fiber has the smaller core (9 μm); multi-mode fiber cores are 50 or 62.5 μm.
- ✗
Any SFP transceiver, regardless of vendor, will operate in a Cisco switch by default.
Why it's wrong here
Cisco switches may reject non-Cisco coded optics unless explicitly allowed via the 'service unsupported-transceiver' command, and even then some platforms require Cisco-branded SFPs.
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.
✓SFP modules are hot-swappable, meaning they can be inserted or removed without powering off the switch.Correct answer▾
Why this is correct
Small Form-factor Pluggable transceivers are designed for hot insertion/removal to minimize network downtime.
✗Copper 1000BASE-T SFP modules can transmit data up to 10 km over Category 5e cabling.Wrong answer — click to see why▾
Why this is wrong here
1000BASE-T SFPs (such as the GLC-T) have a maximum reach of 100 m, not 10 km. 10 km is typical for 1000BASE-LX/LH single-mode fiber SFPs.
✗Multi-mode fiber uses a smaller core diameter, about 9 microns, compared to single-mode fiber.Wrong answer — click to see why▾
Why this is wrong here
Multi-mode fibers have larger cores to allow multiple light paths, while single-mode’s narrow core supports only one path. The 9-micron core is characteristic of single-mode.
✗Any SFP transceiver, regardless of vendor, will operate in a Cisco switch by default.Wrong answer — click to see why▾
Why this is wrong here
Cisco IOS checks the SFP EEPROM for vendor coding. Third-party SFPs might not be recognized, causing an error or link failure until unsupported transceiver mode is enabled.
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 distance limits, and the trap here is assuming that a copper SFP can achieve fiber-like distances, when in reality 1000BASE-T is strictly limited to 100 meters.
Trap categories for this question
Command / output trap
Cisco switches may reject non-Cisco coded optics unless explicitly allowed via the 'service unsupported-transceiver' command, and even then some platforms require Cisco-branded SFPs.
Detailed technical explanation
How to think about this question
The 'show interfaces transceiver' command (often abbreviated as 'show int trans') reads diagnostic data from the SFP's digital diagnostic monitoring (DDM) interface, which provides real-time metrics like temperature, voltage, bias current, and transmit/receive optical power. This is critical for proactive monitoring of fiber links, as optical power levels outside the normal range (e.g., -3 to -20 dBm for receive power) can indicate dirty connectors, fiber bends, or impending failure. In production networks, DDM data helps engineers identify degrading links before they cause outages.
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
Got this wrong? Here's your next step.
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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: SFP modules are hot-swappable, meaning they can be inserted or removed without powering off the switch. — Option A is correct because SFP (Small Form-factor Pluggable) modules are designed to be hot-swappable, allowing insertion or removal without powering down the switch. This capability is essential for maintaining network uptime during maintenance or upgrades, as the switch can dynamically detect and configure the module without a reboot.
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.
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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Last reviewed: Jun 25, 2026
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