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Question 1,107 of 1,389
Installing Fiber Optic Cable and SFP Modules on Cisco Switches
Drag and drop the following steps into the correct order to install a new fiber optic link between two switches, including SFP insertion and basic troubleshooting.
Quick Answer
The correct sequence is to insert the SFP into Switch A first, then connect the fiber optic cable, verify link status on Switch A, then repeat the process for Switch B, and finally verify link status on both switches. This order is critical because inserting the SFP before attaching the fiber cable prevents dust contamination and electrostatic discharge damage to the exposed optical ports, while verifying link status on one switch before the other end is connected is futile since the link cannot come up until both SFPs and cables are properly installed. On the CCNA 200-301 v2 exam, this drag-and-drop task tests your understanding of physical installation best practices and Layer 1 troubleshooting—a common trap is choosing to insert both SFPs first, which leaves them vulnerable to damage, or connecting the cable before inserting the SFP, which can strain the connector. A reliable memory tip is “SFP first, cable second, verify last—one switch at a time,” ensuring you never skip the protective insertion step.
⚠ Common exam trap
The exam trap is that candidates may think it is acceptable to insert both SFPs first or to verify the link on one switch before the other end is connected. Remember that fiber optic installation requires careful handling: insert SFP, then cable, and only verify after both ends are complete.
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
✓
Insert SFP into Switch A, connect fiber cable to SFP on Switch A, then insert SFP into Switch B and connect fiber cable to SFP on Switch B, then verify link status on both switches.
The correct installation order follows best practice: insert the SFP and connect the cable on one switch before moving to the other. This minimizes the time the SFP module is exposed and prevents potential damage. Option A is the only correct sequence. Option B exposes both SFPs before cabling, increasing risk of contamination. Option C attempts to connect cables before inserting SFPs, which is impractical and can cause damage. Option D verifies link on Switch A before the other end is connected, which will show a down state and is not a valid step sequence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Insert SFP into Switch A, connect fiber cable to SFP on Switch A, then insert SFP into Switch B and connect fiber cable to SFP on Switch B, then verify link status on both switches.
Why this is correct
Correct. This sequence follows best practice: insert SFP, attach cable on one switch, then repeat on the other, and finally verify link on both switches.
- ✗
Insert SFP into Switch A, then insert SFP into Switch B, then connect fiber cable to both SFPs, then verify link status on both switches.
Why it's wrong here
Incorrect. Inserting both SFPs before connecting cables leaves modules exposed and increases risk of dust or damage.
- ✗
Connect fiber cable to SFP on Switch A, then insert SFP into Switch A, then connect fiber cable to SFP on Switch B, then insert SFP into Switch B, then verify link status on both switches.
Why it's wrong here
Incorrect. Connecting cables to SFPs before inserting them into switches is not feasible and can damage connectors or ports.
- ✗
Insert SFP into Switch A, connect fiber cable to SFP on Switch A, then verify link status on Switch A, then insert SFP into Switch B and connect fiber cable to SFP on Switch B, then verify link status on Switch B.
Why it's wrong here
Incorrect. Verifying link status on Switch A before Switch B is connected will always show down, making this an invalid troubleshooting step.
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.
✓Insert SFP into Switch A, connect fiber cable to SFP on Switch A, then insert SFP into Switch B and connect fiber cable to SFP on Switch B, then verify link status on both switches.Correct answer▾
Why this is correct
Correct. This sequence follows best practice: insert SFP, attach cable on one switch, then repeat on the other, and finally verify link on both switches.
✗Insert SFP into Switch A, then insert SFP into Switch B, then connect fiber cable to both SFPs, then verify link status on both switches.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that the fiber cable should be connected to each SFP immediately after insertion to minimize exposure of the SFP port and cable connectors to dust and damage.
Why candidates choose this
Candidates might think it is more efficient to insert both SFPs first before connecting cables, but this overlooks best practices for fiber optic handling.
✗Connect fiber cable to SFP on Switch A, then insert SFP into Switch A, then connect fiber cable to SFP on Switch B, then insert SFP into Switch B, then verify link status on both switches.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that the SFP must be installed in the switch port first, then the cable attached. Attaching the cable first is not recommended and can lead to damage.
Why candidates choose this
Candidates might think that connecting the cable to the SFP first is easier, but they forget that the SFP is designed to be inserted into the switch before cabling.
✗Insert SFP into Switch A, connect fiber cable to SFP on Switch A, then verify link status on Switch A, then insert SFP into Switch B and connect fiber cable to SFP on Switch B, then verify link status on Switch B.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that link verification should be performed after both SFPs and cables are installed on both switches. Checking prematurely provides no meaningful information.
Why candidates choose this
Candidates might think it is good to verify each step, but they misunderstand that the link cannot be established until both ends are connected.
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?”
About these practice questions
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Same concept, more angles
2 more ways this is tested on 200-301
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the following steps into the correct order to install a new fiber optic cable, insert the SFP, and verify the link on a Cisco switch.
medium- ✓ A.Install the SFP module into the switch port.
- ✓ B.Attach the fiber optic cable to the SFP.
- ✓ C.Verify the link status using the 'show interfaces' command.
- ✓ D.Check for errors using the 'show interfaces counters errors' command.
Why A: The correct sequence is to first install the SFP module (A), then attach the fiber optic cable to the SFP (B), then verify the link status using 'show interfaces' (C), and finally check for errors using 'show interfaces counters errors' (D). All four steps are required in this order.
Variation 2. Drag and drop the following steps into the correct order to install a new fiber optic cable and SFP module on a Cisco switch, then verify the interface status.
medium- ✓ A.Insert the SFP module into the port while the switch is powered on
- ✓ B.Connect the fiber optic cable to the SFP module
- ✓ C.Verify the interface status using 'show interfaces status'
- D.Power down the switch, connect the fiber optic cable directly to the switch port without an SFP module, power up the switch, and verify the interface status.
Why A: The correct procedure for installing a fiber optic cable and SFP module on a modern Cisco switch is: first, insert the SFP module into the port while the switch is powered on (hot-swap); second, connect the fiber optic cable to the SFP module; third, verify the interface status using 'show interfaces status'. Option D is incorrect because fiber optic cables cannot connect directly to a switch port without an SFP module, and powering down the switch is unnecessary when hot-swapping SFPs.
Last reviewed: Jun 6, 2026
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.
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