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CCNA Hot-swappable SFP Practice Question
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.
⚠ Common exam trap
Many learners assume that SFP modules require the switch to be powered down before installation, but modern Cisco switches support hot-swapping. Always verify the specific module and device documentation.
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 the SFP module into the port while the switch is powered on
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.
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 the SFP module into the port while the switch is powered on
Why this is correct
SFP and SFP+ optical modules support hot-swapping (online insertion and removal), so the switch does not need to be powered off when installing one. The module's serial ID is read by the switch as soon as it is seated in the shared port cage, and the interface can come up once a cable is connected. Before removing or inserting an SFP, it is recommended to issue the 'shutdown' command on the corresponding interface to avoid sending an optical signal into an unseated module, though the hardware itself tolerates OIR without a reboot.
- ✓
Connect the fiber optic cable to the SFP module
Why this is correct
The fiber optic patch cord's LC/SC connector mechanically mates only with the SFP module's engraved receptacle, not the switch faceplate. After the SFP is seated in the switch's cage, the cable must be inserted until it clicks, and the duplex polish must align with the module's transmit and receive ports. This is the physical second step in the sequence, following the SFP insertion.
- ✓
Verify the interface status using 'show interfaces status'
Why this is correct
The 'show interfaces status' command outputs the port name, VLAN, duplex, speed, type (e.g., 1000BASE-SX), and a port status field. A healthy link shows 'connected' for the physical layer; 'notconnect' or 'err-disabled' indicates a cabling, SFP, or VLAN misconfiguration. This verification step should be performed only after the SFP is inserted and the fiber cable is attached, confirming that the optical transceiver and cable pair are functioning end to end.
- ✗
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 it's wrong here
Cisco Catalyst switch ports are either UTP/RJ-45 or SFP/SFP+ cages; there is no direct optical fiber interface on typical access or distribution switches. Powering down the switch is unnecessary because SFP transceivers are built for online insertion and removal, and a fiber strand forced into an RJ-45 jack would damage the jack and the fiber. Even on switches with a dedicated fiber port, the correct procedure is to insert the SFP (or use that built-in port) before connecting the fiber, never to power cycle during a simple media attachment.
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 the SFP module into the port while the switch is powered onCorrect answer▾
Why this is correct
SFP and SFP+ optical modules support hot-swapping (online insertion and removal), so the switch does not need to be powered off when installing one. The module's serial ID is read by the switch as soon as it is seated in the shared port cage, and the interface can come up once a cable is connected. Before removing or inserting an SFP, it is recommended to issue the 'shutdown' command on the corresponding interface to avoid sending an optical signal into an unseated module, though the hardware itself tolerates OIR without a reboot.
✗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.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that fiber optic cables require an SFP module to interface with the switch; direct connection is not possible.
Why candidates choose this
Candidates might confuse fiber with copper connections, where a cable can be plugged directly into an RJ-45 port.
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?”
Go deeper
Related to this question
Learn chapter
STP Port States and Roles
Key term
Interface
An interface is a point of connection or interaction between two systems, devices, or software components that allows them to exchange information or signals.
Key term
Small Form-factor Pluggable
A Small Form-factor Pluggable (SFP) is a compact, hot-swappable transceiver module used to connect networking devices to fiber optic or copper cables, converting electrical signals into light signals for data transmission.
About these practice questions
Courseiva writes every 200-301 question from scratch — 1,389 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.