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CCNA Network Infrastructure and Connectivity Practice Question
Drag and drop the following steps into the correct order to troubleshoot a suspected duplex mismatch and CRC errors on a Cisco switch interface.
⚠ Common exam trap
The exam trap is that candidates often skip the initial step of entering privileged EXEC mode, thinking they can directly check errors or configure. Remember that 'show' and 'configure' commands require the appropriate mode.
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 privileged EXEC mode using the 'enable' command.
The correct troubleshooting sequence starts with entering privileged EXEC mode (step A) because 'show' and 'configure' commands require it. Next, use the 'show interfaces' command (step B) to check for CRC errors and duplex mismatch on the interface. Then, enter global configuration mode (step D) to access interface configuration. Finally, configure the interface with the 'duplex full' command (step C) to fix the mismatch. Placing step C before step D would be invalid because you must be in global configuration mode before you can configure an interface.
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 privileged EXEC mode using the 'enable' command.
Why this is correct
First, enter privileged EXEC mode with the 'enable' command. This is necessary to use show and configure commands.
- ✓
Use the 'show interfaces' command to check for CRC errors and duplex mismatch.
Why this is correct
Next, use the 'show interfaces' command to examine interface statistics and identify CRC errors or duplex mismatch.
- ✓
Configure the interface with the 'duplex full' command to fix the mismatch.
Why this is correct
Finally, configure the interface with the 'duplex full' command. This step must come after entering global configuration mode and specifying the interface.
- ✓
Enter global configuration mode using the 'configure terminal' command.
Why this is correct
Then, enter global configuration mode with 'configure terminal'. This is required before you can configure an interface.
Go deeper
Related to this question
Learn chapter
Half-Duplex vs Full-Duplex
Key term
Cyclic Redundancy Check
A Cyclic Redundancy Check (CRC) is an error-detecting code used to verify that data transmitted over a network or stored on a device has not been corrupted.
Key term
CAN
A CAN (Controller Area Network) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer.
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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.