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CCNA Network Infrastructure and Connectivity Practice Question
Drag and drop the following steps into the correct order to enable a third-party SFP transceiver and verify its diagnostics on a Cisco switch.
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
✓
Enter global configuration mode: configure terminal
Cisco switches by default only support Cisco-branded SFP transceivers. To use a third-party transceiver, the command `service unsupported-transceiver` must be enabled in global configuration mode. After configuring the interface, the `show interfaces transceiver` command displays diagnostic information including temperature, voltage, and optical power, which helps verify proper operation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enter global configuration mode: configure terminal
Why this is correct
The 'configure terminal' command moves from privileged EXEC mode to global configuration mode, which is the mandatory starting point for any system-wide or interface-level parameter on Cisco IOS. Without this step, the subsequent interface-level commands are not accepted by the command-line parser. This is the first step in any router or switch configuration task because all configuration changes are made from this hierarchical mode.
- ✓
Enable support for unsupported transceivers: service unsupported-transceiver
Why this is correct
The 'service unsupported-transceiver' command disables Cisco's default transceiver validation, allowing the switch to operate with non-Cisco or third-party SFP, SFP+, or QSFP modules. Without this command, a switch may flag the module as 'unsupported' and keep the port in error-disable state, preventing the physical layer from coming up. This global command is often required when using compatible transceivers in lab or production environments.
- ✓
Enter interface configuration mode: interface GigabitEthernet0/1
Why this is correct
The 'interface GigabitEthernet0/1' command is used in global configuration mode to enter interface configuration mode for a specific physical port. This context isolates all subsequent settings—such as speed, duplex, and shutdown state—to that particular Ethernet interface. It is necessary because interface-specific commands cannot be executed from global configuration mode; the interface must be explicitly selected first.
- ✓
Bring up the interface: no shutdown
Why this is correct
The 'no shutdown' command administratively enables the GigabitEthernet interface by removing the shutdown state that is default on Cisco switches for physical ports. By default, all interfaces are in an 'administratively down' state, which blocks all traffic even if a transceiver is physically connected and detected. Issuing 'no shutdown' is the final configuration step that brings the port up, analogous to flipping a software switch from OFF to ON.
- ✓
Verify transceiver diagnostics: show interfaces transceiver GigabitEthernet0/1 detail
Why this is correct
The 'show interfaces transceiver GigabitEthernet0/1 detail' command verifies the operational status of the installed transceiver by displaying optical parameters such as temperature, voltage, and TX/RX power levels, along with the connection status. This command is crucial after configuration because it confirms that the transceiver is recognized, operating within threshold ranges, and that the link is ready for traffic. Without this verification, an unsupported transceiver might appear to come up but could still fail intermittently due to marginal signal quality.
Go deeper
Related to this question
Learn chapter
VTP Versions and Configuration
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
Switch
A switch is a networking device that connects devices on a local area network and uses MAC addresses to forward data only to the intended recipient.
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