The correct answer is that the 'show interfaces ge-0/0/0 extensive' command provides detailed error counters and traffic statistics. This is because the extensive output expands on the standard interface display by breaking down errors like CRC, frame, giants, and runts, which are not shown in the basic output, while also listing traffic statistics such as unicast, multicast, and broadcast packet counts and rates. On the JNCIA-Junos exam, this command tests your ability to differentiate between standard and extensive interface outputs, often appearing in questions that ask which two statements are true about the output. A common trap is assuming the standard command shows the same depth of error data, but only the extensive flag reveals those granular counters. Memory tip: think "extensive equals extra errors and traffic stats" — the 'e' in extensive stands for errors and everything else.
JNCIA-JUNOS Operational Monitoring and Maintenance Practice Question
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 are true about the 'show interfaces ge-0/0/0 extensive' command output?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It displays a detailed count of errors
The 'show interfaces ge-0/0/0 extensive' command in Junos OS provides a comprehensive view of the interface, including detailed error counters (e.g., CRC errors, frame errors, giants, runts) and traffic statistics (e.g., input/output bytes, packets, and rates). Option A is correct because the extensive output explicitly lists a detailed count of errors per interface, which is not available in the standard 'show interfaces' output. Option C is correct because traffic statistics such as unicast, multicast, and broadcast packets are included in the extensive output.
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.
✓
It displays a detailed count of errors
Why this is correct
Extensive includes error counters.
Related concept
Read the scenario before looking for a memorised answer.
✗
It includes only layer 1 information
Why it's wrong here
Extensive includes layer 2 and 3 as well.
✓
It provides traffic statistics
Why this is correct
Extensive includes input/output rates.
Related concept
Read the scenario before looking for a memorised answer.
✗
It shows the interface configuration
Why it's wrong here
Configuration is shown by 'show configuration interfaces'.
✗
It indicates the administrative status
Why it's wrong here
Administrative status is shown in terse, but extensive also shows it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume 'extensive' only adds more Layer 1 details, but it actually includes Layer 2 and Layer 3 operational data, and they may also confuse operational output with configuration commands.
Trap categories for this question
Command / output trap
Configuration is shown by 'show configuration interfaces'.
Detailed technical explanation
How to think about this question
The 'extensive' modifier triggers a detailed dump of interface counters from the Packet Forwarding Engine (PFE), including per-queue statistics and hardware-specific error registers. In real-world troubleshooting, this command is essential for identifying physical layer issues like excessive CRC errors due to faulty cabling or duplex mismatches, as it exposes granular error types that the standard output omits.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It displays a detailed count of errors — The 'show interfaces ge-0/0/0 extensive' command in Junos OS provides a comprehensive view of the interface, including detailed error counters (e.g., CRC errors, frame errors, giants, runts) and traffic statistics (e.g., input/output bytes, packets, and rates). Option A is correct because the extensive output explicitly lists a detailed count of errors per interface, which is not available in the standard 'show interfaces' output. Option C is correct because traffic statistics such as unicast, multicast, and broadcast packets are included in the extensive output.
What should I do if I get this JNCIA-JUNOS 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.
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Question Discussion
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